diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..6eb9dae
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,65 @@
+# Based on the "trust" template v0.1.2
+# https://github.com/japaric/trust/tree/v0.1.2
+
+dist: trusty
+language: rust
+services: docker
+sudo: required
+rust: nightly-2018-04-19
+cache: cargo
+
+env:
+  global:
+    - CRATE_NAME=poa-ballot-stats
+    - RUST_BACKTRACE=1
+    - RUSTFLAGS="-D warnings"
+
+matrix:
+  include:
+    - env: TARGET=x86_64-unknown-linux-gnu
+    - env: TARGET=x86_64-apple-darwin
+      os: osx
+
+before_install:
+  - set -e
+  - rustup self update
+  - rustup component add rustfmt-preview
+  # - cargo install clippy -f --vers=0.0.195
+
+install:
+  - sh ci/install.sh
+  - source ~/.cargo/env || true
+
+script:
+  - bash ci/script.sh
+
+after_script: set +e
+
+before_deploy:
+  - sh ci/before_deploy.sh
+
+deploy:
+  api_key:
+    secure: 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
+  file_glob: true
+  file: $CRATE_NAME-$TRAVIS_TAG-$TARGET.*
+  on:
+    condition: $TRAVIS_RUST_VERSION = nightly-2018-04-19
+    tags: true
+  provider: releases
+  skip_cleanup: true
+
+cache: cargo
+before_cache:
+  # Travis can't cache files that are not readable by "others"
+  - chmod -R a+r $HOME/.cargo
+
+branches:
+  only:
+    # release tags
+    - /^v\d+\.\d+\.\d+.*$/
+    - master
+
+notifications:
+  email:
+    on_success: never
diff --git a/Cargo.lock b/Cargo.lock
index f13ac0c..7b992e2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,7 +16,7 @@ dependencies = [
 
 [[package]]
 name = "atty"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -26,13 +26,13 @@ dependencies = [
 
 [[package]]
 name = "backtrace"
-version = "0.3.5"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -41,7 +41,7 @@ name = "backtrace-sys"
 version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -50,7 +50,7 @@ name = "base64"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -58,16 +58,16 @@ name = "base64"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "base64"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -78,31 +78,31 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "1.0.1"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.2.1"
+version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bytes"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.9"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -111,8 +111,8 @@ version = "2.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "atty 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "textwrap 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -146,11 +146,11 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -159,27 +159,19 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "crossbeam-utils"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "crossbeam-utils"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -197,7 +189,7 @@ name = "error-chain"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -206,14 +198,30 @@ version = "5.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethereum-types 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethereum-types 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ethabi-contract"
+version = "5.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "ethabi-derive"
+version = "5.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ethabi 5.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heck 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.13.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ethbloom"
 version = "0.5.0"
@@ -221,22 +229,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "fixed-hash 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fixed-hash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ethereum-types"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "fixed-hash 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fixed-hash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -245,12 +253,12 @@ name = "ethereum-types-serialize"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "fixed-hash"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -277,7 +285,7 @@ name = "fuchsia-zircon"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -288,7 +296,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -296,7 +304,7 @@ name = "futures-cpupool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -308,6 +316,14 @@ dependencies = [
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "httparse"
 version = "1.2.4"
@@ -333,22 +349,23 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "0.11.24"
+version = "0.11.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "base64 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "mime 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -360,10 +377,10 @@ name = "hyper-tls"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -376,7 +393,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -398,11 +415,11 @@ name = "jsonrpc-core"
 version = "8.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -452,7 +469,7 @@ name = "log"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -475,7 +492,7 @@ dependencies = [
 
 [[package]]
 name = "mime"
-version = "0.3.5"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -501,9 +518,10 @@ dependencies = [
 
 [[package]]
 name = "mio-uds"
-version = "0.6.4"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -527,7 +545,7 @@ dependencies = [
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "schannel 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "schannel 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "security-framework 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -538,7 +556,7 @@ name = "net2"
 version = "0.2.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -548,11 +566,6 @@ name = "nodrop"
 version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "num-traits"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "num_cpus"
 version = "1.8.0"
@@ -570,18 +583,18 @@ dependencies = [
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.27"
+version = "0.9.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -594,21 +607,21 @@ dependencies = [
 
 [[package]]
 name = "parking_lot"
-version = "0.5.4"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.2.13"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -619,7 +632,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "pkg-config"
-version = "0.3.9"
+version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -630,15 +643,17 @@ dependencies = [
  "colored 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi 5.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethabi-contract 5.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethabi-derive 5.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "web3 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "0.2.3"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -646,10 +661,10 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "0.4.2"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -690,12 +705,12 @@ name = "relay"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "remove_dir_all"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -703,7 +718,7 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -726,7 +741,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "schannel"
-version = "0.1.11"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -735,7 +750,7 @@ dependencies = [
 
 [[package]]
 name = "scoped-tls"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -778,38 +793,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.36"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.36"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive_internals 0.22.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.12.15 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "serde_derive_internals"
-version = "0.22.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.12.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.13.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.13"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -834,7 +838,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "smallvec"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -849,11 +853,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.12.15"
+version = "0.13.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -868,7 +872,7 @@ version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "remove_dir_all 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -909,43 +913,55 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "0.1.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-fs 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-udp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-core"
-version = "0.1.16"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "scoped-tls 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scoped-tls 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-executor"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "tokio-fs"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -953,8 +969,8 @@ name = "tokio-io"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -963,14 +979,14 @@ name = "tokio-proto"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "take 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -980,11 +996,11 @@ name = "tokio-reactor"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -993,7 +1009,7 @@ name = "tokio-service"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1001,8 +1017,8 @@ name = "tokio-tcp"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1011,15 +1027,15 @@ dependencies = [
 
 [[package]]
 name = "tokio-threadpool"
-version = "0.1.1"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-deque 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-executor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1027,18 +1043,27 @@ name = "tokio-timer"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-timer"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-tls"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1047,8 +1072,8 @@ name = "tokio-udp"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1060,14 +1085,14 @@ name = "tokio-uds"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
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 dependencies = [
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@@ -1118,7 +1143,12 @@ dependencies = [
 
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+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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 [[package]]
@@ -1143,7 +1173,7 @@ dependencies = [
 
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 [[package]]
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@@ -1371,11 +1403,12 @@ dependencies = [
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diff --git a/Cargo.toml b/Cargo.toml
index e2ac3a1..174a8e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,8 @@ clap = "2.31.2"
 colored = "1.6.0"
 error-chain = { version = "0.11", default-features = false }
 ethabi = "5.1.1"
+ethabi-contract = "5.1.0"
+ethabi-derive = "5.1.2"
 serde = "1.0.36"
 serde_derive = "1.0.36"
 serde_json = "1.0.13"
diff --git a/README.md b/README.md
index f67130b..56f56ac 100644
--- a/README.md
+++ b/README.md
@@ -1,20 +1,28 @@
 # POA ballot stats
 
-**Note**: This is still work in progress. It doesn't yet correctly determine the initial set of
-validators.
-
 A command line tool that displays voting statistics for the [POA network](https://poa.network/).
 It requires a recent version of [Rust](https://www.rust-lang.org/), and needs to communicate with a
 fully synchronized node that is connected to the network:
 [POA installation](https://github.com/poanetwork/wiki/wiki/POA-Installation).
+Note that `poa-ballot-stats` needs access to the network's full logs, so the node must run with
+`--pruning=archive --no-warp`.
 
 You can view the command line options with `-h`, and specify a different endpoint if your node e.g.
-uses a non-standard port. The `-c` option takes a map with the POA contracts' addresses in JSON
-format. You can find the current maps for the main and test network in
-[poa-chain-spec](https://github.com/poanetwork/poa-chain-spec)'s `core` and `sokol` branches.
+uses a non-standard port. By default, it tries to connect to a local node `http://127.0.0.1:8545`.
+In verbose mode, with `-v`, the complete list of collected events is displayed.
+
+The `-c` option takes a map with the POA contracts' addresses in JSON format. You can find the 
+current maps for the main and test network the `contracts` folder. By default, it uses `core.json`,
+for the main network.
+
+Examples:
 
 ```bash
 $ cargo run -- -h
-$ cargo run -- -c ../poa-chain-spec/contracts.json http://127.0.0.1:8545
+$ cargo run
+$ cargo run -- -c contracts/sokol.json https://sokol.poa.network -v
 ```
 
+## Screenshot
+
+![Screenshot](screenshot.png)
diff --git a/abi/ValidatorMetadata.abi.json b/abi/ValidatorMetadata.abi.json
index 54325b7..3c65a01 100644
--- a/abi/ValidatorMetadata.abi.json
+++ b/abi/ValidatorMetadata.abi.json
@@ -3,7 +3,7 @@
     "constant": true,
     "inputs": [
       {
-        "name": "",
+        "name": "_miningKey",
         "type": "address"
       }
     ],
@@ -31,7 +31,7 @@
       },
       {
         "name": "zipcode",
-        "type": "uint256"
+        "type": "bytes32"
       },
       {
         "name": "expirationDate",
@@ -58,7 +58,7 @@
     "constant": true,
     "inputs": [
       {
-        "name": "",
+        "name": "_newProxyAddress",
         "type": "address"
       }
     ],
@@ -67,12 +67,54 @@
       {
         "name": "count",
         "type": "uint256"
+      },
+      {
+        "name": "voters",
+        "type": "address[]"
       }
     ],
     "payable": false,
     "stateMutability": "view",
     "type": "function"
   },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "_firstName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_lastName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_licenseId",
+        "type": "bytes32"
+      },
+      {
+        "name": "_fullAddress",
+        "type": "string"
+      },
+      {
+        "name": "_state",
+        "type": "bytes32"
+      },
+      {
+        "name": "_zipcode",
+        "type": "bytes32"
+      },
+      {
+        "name": "_expirationDate",
+        "type": "uint256"
+      }
+    ],
+    "name": "createMetadata",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
   {
     "constant": true,
     "inputs": [],
@@ -105,7 +147,7 @@
     "constant": true,
     "inputs": [
       {
-        "name": "",
+        "name": "_miningKey",
         "type": "address"
       }
     ],
@@ -114,6 +156,10 @@
       {
         "name": "count",
         "type": "uint256"
+      },
+      {
+        "name": "voters",
+        "type": "address[]"
       }
     ],
     "payable": false,
@@ -134,6 +180,20 @@
     "stateMutability": "nonpayable",
     "type": "function"
   },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "version",
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
   {
     "constant": true,
     "inputs": [],
@@ -149,50 +209,17 @@
     "type": "function"
   },
   {
-    "constant": false,
-    "inputs": [
-      {
-        "name": "_firstName",
-        "type": "bytes32"
-      },
-      {
-        "name": "_lastName",
-        "type": "bytes32"
-      },
-      {
-        "name": "_licenseId",
-        "type": "bytes32"
-      },
-      {
-        "name": "_fullAddress",
-        "type": "string"
-      },
-      {
-        "name": "_state",
-        "type": "bytes32"
-      },
-      {
-        "name": "_zipcode",
-        "type": "uint256"
-      },
-      {
-        "name": "_expirationDate",
-        "type": "uint256"
-      },
-      {
-        "name": "_miningKey",
-        "type": "address"
-      }
-    ],
-    "name": "changeRequestForValidator",
+    "constant": true,
+    "inputs": [],
+    "name": "implementation",
     "outputs": [
       {
         "name": "",
-        "type": "bool"
+        "type": "address"
       }
     ],
     "payable": false,
-    "stateMutability": "nonpayable",
+    "stateMutability": "view",
     "type": "function"
   },
   {
@@ -239,20 +266,31 @@
       },
       {
         "name": "_zipcode",
-        "type": "uint256"
+        "type": "bytes32"
       },
       {
         "name": "_expirationDate",
         "type": "uint256"
-      }
-    ],
-    "name": "changeRequest",
-    "outputs": [
+      },
       {
-        "name": "",
-        "type": "bool"
+        "name": "_createdDate",
+        "type": "uint256"
+      },
+      {
+        "name": "_updatedDate",
+        "type": "uint256"
+      },
+      {
+        "name": "_minThreshold",
+        "type": "uint256"
+      },
+      {
+        "name": "_miningKey",
+        "type": "address"
       }
     ],
+    "name": "initMetadata",
+    "outputs": [],
     "payable": false,
     "stateMutability": "nonpayable",
     "type": "function"
@@ -313,6 +351,96 @@
     "stateMutability": "view",
     "type": "function"
   },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "_firstName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_lastName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_licenseId",
+        "type": "bytes32"
+      },
+      {
+        "name": "_fullAddress",
+        "type": "string"
+      },
+      {
+        "name": "_state",
+        "type": "bytes32"
+      },
+      {
+        "name": "_zipcode",
+        "type": "bytes32"
+      },
+      {
+        "name": "_expirationDate",
+        "type": "uint256"
+      },
+      {
+        "name": "_miningKey",
+        "type": "address"
+      }
+    ],
+    "name": "changeRequestForValidator",
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "_firstName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_lastName",
+        "type": "bytes32"
+      },
+      {
+        "name": "_licenseId",
+        "type": "bytes32"
+      },
+      {
+        "name": "_fullAddress",
+        "type": "string"
+      },
+      {
+        "name": "_state",
+        "type": "bytes32"
+      },
+      {
+        "name": "_zipcode",
+        "type": "bytes32"
+      },
+      {
+        "name": "_expirationDate",
+        "type": "uint256"
+      }
+    ],
+    "name": "changeRequest",
+    "outputs": [
+      {
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
   {
     "constant": true,
     "inputs": [
@@ -408,37 +536,8 @@
   },
   {
     "constant": false,
-    "inputs": [
-      {
-        "name": "_firstName",
-        "type": "bytes32"
-      },
-      {
-        "name": "_lastName",
-        "type": "bytes32"
-      },
-      {
-        "name": "_licenseId",
-        "type": "bytes32"
-      },
-      {
-        "name": "_fullAddress",
-        "type": "string"
-      },
-      {
-        "name": "_state",
-        "type": "bytes32"
-      },
-      {
-        "name": "_zipcode",
-        "type": "uint256"
-      },
-      {
-        "name": "_expirationDate",
-        "type": "uint256"
-      }
-    ],
-    "name": "createMetadata",
+    "inputs": [],
+    "name": "initMetadataDisable",
     "outputs": [],
     "payable": false,
     "stateMutability": "nonpayable",
@@ -462,7 +561,7 @@
     "constant": true,
     "inputs": [
       {
-        "name": "",
+        "name": "_miningKey",
         "type": "address"
       }
     ],
@@ -490,7 +589,7 @@
       },
       {
         "name": "zipcode",
-        "type": "uint256"
+        "type": "bytes32"
       },
       {
         "name": "expirationDate",
@@ -513,17 +612,6 @@
     "stateMutability": "view",
     "type": "function"
   },
-  {
-    "inputs": [
-      {
-        "name": "_proxyStorage",
-        "type": "address"
-      }
-    ],
-    "payable": false,
-    "stateMutability": "nonpayable",
-    "type": "constructor"
-  },
   {
     "anonymous": false,
     "inputs": [
diff --git a/ci/before_deploy.sh b/ci/before_deploy.sh
new file mode 100644
index 0000000..1fe7eef
--- /dev/null
+++ b/ci/before_deploy.sh
@@ -0,0 +1,32 @@
+# This script takes care of building your crate and packaging it for release
+
+set -ex
+
+main() {
+    local src=$(pwd) \
+          stage=
+
+    case $TRAVIS_OS_NAME in
+        linux)
+            stage=$(mktemp -d)
+            ;;
+        osx)
+            stage=$(mktemp -d -t tmp)
+            ;;
+    esac
+
+    test -f Cargo.lock || cargo generate-lockfile
+
+    cross rustc --bin poa-ballot-stats --target $TARGET --release -- -C lto
+
+    cp target/$TARGET/release/poa-ballot-stats $stage/
+    cp -r contracts $stage/
+
+    cd $stage
+    tar czf $src/$CRATE_NAME-$TRAVIS_TAG-$TARGET.tar.gz *
+    cd $src
+
+    rm -rf $stage
+}
+
+main
diff --git a/ci/install.sh b/ci/install.sh
new file mode 100644
index 0000000..748ad9a
--- /dev/null
+++ b/ci/install.sh
@@ -0,0 +1,27 @@
+set -ex
+
+main() {
+    local target=
+    if [ $TRAVIS_OS_NAME = linux ]; then
+        target=x86_64-unknown-linux-musl
+        sort=sort
+    else
+        target=x86_64-apple-darwin
+        sort=gsort  # for `sort --sort-version`, from brew's coreutils.
+    fi
+
+    # This fetches latest stable release
+    local tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross \
+                       | cut -d/ -f3 \
+                       | grep -E '^v[0.1.0-9.]+$' \
+                       | $sort --version-sort \
+                       | tail -n1)
+    curl -LSfs https://japaric.github.io/trust/install.sh | \
+        sh -s -- \
+           --force \
+           --git japaric/cross \
+           --tag $tag \
+           --target $target
+}
+
+main
diff --git a/ci/script.sh b/ci/script.sh
new file mode 100644
index 0000000..d56a9cf
--- /dev/null
+++ b/ci/script.sh
@@ -0,0 +1,22 @@
+set -ex
+
+main() {
+    cargo fmt -- --write-mode=diff
+
+    cross build --target $TARGET
+    cross build --target $TARGET --release
+
+    if [ ! -z $DISABLE_TESTS ]; then
+        return
+    fi
+
+    cross test --target $TARGET
+    cross test --target $TARGET --release
+
+    cross build --target $TARGET --release
+}
+
+# we don't run the "test phase" when doing deploys
+if [ -z $TRAVIS_TAG ]; then
+    main
+fi
diff --git a/contracts/core.json b/contracts/core.json
new file mode 100644
index 0000000..77244d3
--- /dev/null
+++ b/contracts/core.json
@@ -0,0 +1,11 @@
+{
+	"VOTING_TO_CHANGE_KEYS_ADDRESS": "0x215794efe4b86a2fbcbf706bc9ade63663f1eae1",
+	"VOTING_TO_CHANGE_MIN_THRESHOLD_ADDRESS": "0xca863b0d12193a87b5173fd51fa4aa1703fb8a32",
+	"VOTING_TO_CHANGE_PROXY_ADDRESS": "0x9c8a06f0197ee718cd820adeb48a88ea2a9b5c48",
+	"BALLOTS_STORAGE_ADDRESS": "0x3a28ecc276d222829f78c98d43d719eafda0a6fe",
+	"KEYS_MANAGER_ADDRESS": "0x2b1dbc7390a65dc40f7d64d67ea11b4d627dd1bf",
+	"METADATA_ADDRESS": "0x4c0eb450d8dfa6e89eb14ac154867bc86b3c559c",
+	"PROXY_ADDRESS": "0x6f4aadbb17789b4f5e9e97d456dc4e01b117ccb3",
+	"POA_ADDRESS": "0x83451c8bc04d4ee9745ccc58edfab88037bc48cc",
+	"MOC": "0xCf260eA317555637C55F70e55dbA8D5ad8414Cb0"
+}
\ No newline at end of file
diff --git a/contracts/sokol.json b/contracts/sokol.json
new file mode 100644
index 0000000..7617ead
--- /dev/null
+++ b/contracts/sokol.json
@@ -0,0 +1,11 @@
+{
+	"VOTING_TO_CHANGE_KEYS_ADDRESS": "0xc40cdf254a4a35498aa84f35e9842c110729a2a0",
+	"VOTING_TO_CHANGE_MIN_THRESHOLD_ADDRESS": "0x700db8ba3128087f3b23f60de4bc3179bafa467d",
+	"VOTING_TO_CHANGE_PROXY_ADDRESS": "0x0aa4a75549757a90f62f88b3b96b69bead2db0ff",
+	"BALLOTS_STORAGE_ADDRESS": "0x27e7d2572aa37bec2ed30795f2fabccda4781f86",
+	"KEYS_MANAGER_ADDRESS": "0x1aa02bd52fe418ac70263351282f66f1dacf898c",
+	"METADATA_ADDRESS": "0xf71dd3797e4f173c2c08f2cebe8a6801d8191b42",
+	"PROXY_ADDRESS": "0x3f918617a055d48e90f9fe06c168a75134565190",
+	"POA_ADDRESS": "0x03048F666359CFD3C74a1A5b9a97848BF71d5038",
+	"MOC": "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca"
+}
\ No newline at end of file
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..21392be
Binary files /dev/null and b/screenshot.png differ
diff --git a/src/error.rs b/src/error.rs
index 6dff5bf..714b432 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -12,5 +12,9 @@ error_chain! {
         UnexpectedLogParams {
             description("Unexpected parameter types in log"),
         }
+        NoEventsFound {
+            description("No events found. \
+                         Make sure your node is running in 'full' mode, not 'light'."),
+        }
     }
 }
diff --git a/src/events.rs b/src/events.rs
deleted file mode 100644
index aae6164..0000000
--- a/src/events.rs
+++ /dev/null
@@ -1,119 +0,0 @@
-use error::{ErrorKind, Result};
-use ethabi::{Address, FixedBytes, Log, RawTopicFilter, Token, Topic, Uint};
-use util::LogExt;
-
-/// An event that is logged when the current set of validators has changed.
-#[derive(Debug)]
-pub struct ChangeFinalized {
-    /// The new set of validators.
-    pub new_set: Vec<Address>,
-}
-
-impl ChangeFinalized {
-    /// Parses the log and returns a `ChangeFinalized`, if the log corresponded to such an event.
-    pub fn from_log(log: &Log) -> Result<ChangeFinalized> {
-        log.param(0, "newSet")
-            .cloned()
-            .and_then(Token::to_array)
-            .map(|tokens| ChangeFinalized {
-                new_set: tokens.into_iter().filter_map(Token::to_address).collect(),
-            })
-            .ok_or_else(|| ErrorKind::UnexpectedLogParams.into())
-    }
-}
-
-#[derive(Debug)]
-pub struct InitiateChange {
-    /// The previous voter set's hash.
-    parent_hash: FixedBytes,
-    /// The new set of validators.
-    pub new_set: Vec<Address>,
-}
-
-impl InitiateChange {
-    /// Parses the log and returns a `InitiateChange`, if the log corresponded to such an event.
-    pub fn from_log(log: &Log) -> Result<InitiateChange> {
-        match (
-            log.param(0, "parentHash")
-                .cloned()
-                .and_then(Token::to_fixed_bytes),
-            log.param(1, "newSet").cloned().and_then(Token::to_array),
-        ) {
-            (Some(parent_hash), Some(tokens)) => Ok(InitiateChange {
-                parent_hash,
-                new_set: tokens.into_iter().filter_map(Token::to_address).collect(),
-            }),
-            _ => Err(ErrorKind::UnexpectedLogParams.into()),
-        }
-    }
-}
-
-/// An event that is logged when a new ballot is started.
-#[derive(Debug)]
-pub struct BallotCreated {
-    /// The ballot ID.
-    pub id: Uint,
-    /// The ballot type.
-    ballot_type: Uint,
-    /// The creator's voting key.
-    creator: Address,
-}
-
-impl BallotCreated {
-    /// Parses the log and returns a `BallotCreated`, if the log corresponded to such an event.
-    pub fn from_log(log: &Log) -> Result<BallotCreated> {
-        match (
-            log.uint_param(0, "id"),
-            log.uint_param(1, "ballotType"),
-            log.address_param(2, "creator"),
-        ) {
-            (Some(&id), Some(&ballot_type), Some(&creator)) => Ok(BallotCreated {
-                id,
-                ballot_type,
-                creator,
-            }),
-            _ => Err(ErrorKind::UnexpectedLogParams.into()),
-        }
-    }
-
-    /// Returns a topic filter to find the votes corresponding to this ballot.
-    pub fn vote_topic_filter(&self) -> RawTopicFilter {
-        RawTopicFilter {
-            topic0: Topic::This(Token::Uint(self.id)),
-            ..RawTopicFilter::default()
-        }
-    }
-}
-
-/// An event that is logged whenever someone casts a vote in a ballot.
-#[derive(Debug)]
-pub struct Vote {
-    /// The ballot ID.
-    id: Uint,
-    /// The decision this vote is for.
-    decision: Uint,
-    /// The voter's voting key.
-    pub voter: Address,
-    /// The timestamp of this vote.
-    time: Uint,
-}
-
-impl Vote {
-    /// Parses the log and returns a `Vote`, if the log corresponded to such an event.
-    pub fn from_log(log: &Log) -> Result<Vote> {
-        match (
-            log.uint_param(0, "id"),
-            log.uint_param(1, "decision"),
-            log.address_param(2, "voter"),
-            log.uint_param(3, "time"),
-        ) {
-            (Some(&id), Some(&decision), Some(&voter), Some(&time)) => Ok(Vote {
-                id,
-                decision,
-                voter,
-                time,
-            }),
-            _ => Err(ErrorKind::UnexpectedLogParams.into()),
-        }
-    }
-}
diff --git a/src/main.rs b/src/main.rs
index 35546e8..affaca0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,33 +3,50 @@ extern crate colored;
 #[macro_use]
 extern crate error_chain;
 extern crate ethabi;
+#[macro_use(EthabiContract)]
+extern crate ethabi_derive;
+#[macro_use(use_contract)]
+extern crate ethabi_contract;
 extern crate serde;
-#[macro_use]
+#[macro_use(Deserialize)]
 extern crate serde_derive;
 extern crate serde_json;
 extern crate web3;
 
 mod cli;
 mod error;
-mod events;
 mod stats;
 mod util;
 mod validator;
 
 use error::{Error, ErrorKind};
-use events::{BallotCreated, ChangeFinalized, InitiateChange, Vote};
+use ethabi::Address;
 use stats::Stats;
 use std::default::Default;
 use std::fs::File;
-use util::{ContractExt, TopicFilterExt, Web3LogExt};
+use std::time::{SystemTime, UNIX_EPOCH};
+use util::{HexBytes, HexList, TopicFilterExt, Web3LogExt};
 use web3::futures::Future;
 
-// TODO: `ethabi_derive` produces unparseable tokens.
-// mod voting_to_change_keys {
-//     #[derive(EthabiContract)]
-//     #[ethabi_contract_options(name = "VotingToChangeKeys", path = "abi/VotingToChangeKeys.json")]
-//     struct _Dummy;
-// }
+/// The maximum age in seconds of the latest block.
+const MAX_BLOCK_AGE: u64 = 60 * 60;
+
+use_contract!(
+    net_con,
+    "NetworkConsensus",
+    "abi/PoaNetworkConsensus.abi.json"
+);
+use_contract!(
+    voting,
+    "VotingToChangeKeys",
+    "abi/VotingToChangeKeys.abi.json"
+);
+use_contract!(
+    val_meta,
+    "ValidatorMetadata",
+    "abi/ValidatorMetadata.abi.json"
+);
+use_contract!(key_mgr, "KeysManager", "abi/KeysManager.abi.json");
 
 #[derive(Deserialize)]
 #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
@@ -38,12 +55,15 @@ struct ContractAddresses {
     keys_manager_address: String,
 }
 
-impl Default for ContractAddresses {
-    fn default() -> ContractAddresses {
-        ContractAddresses {
-            metadata_address: "0x4c0eb450d8dfa6e89eb14ac154867bc86b3c559c".to_string(),
-            keys_manager_address: "0x2b1dbc7390a65dc40f7d64d67ea11b4d627dd1bf".to_string(),
-        }
+/// Shows a warning if the node's latest block is outdated.
+fn check_synced<T: web3::Transport>(web3: &web3::Web3<T>) {
+    let id = web3::types::BlockId::Number(web3::types::BlockNumber::Latest);
+    let block = web3.eth().block(id).wait().expect("get latest block");
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("Current timestamp is earlier than the Unix epoch!");
+    if block.timestamp < (now.as_secs() - MAX_BLOCK_AGE).into() {
+        eprintln!("WARNING: The node is not fully synchronized. Stats may be inaccurate.");
     }
 }
 
@@ -53,105 +73,112 @@ fn count_votes(
     verbose: bool,
     contract_addrs: &ContractAddresses,
 ) -> Result<Stats, Error> {
+    // Calls `println!` if `verbose` is `true`.
+    macro_rules! vprintln { ($($arg:tt)*) => { if verbose { println!($($arg)*); } } }
+
     let (_eloop, transport) = web3::transports::Http::new(url).unwrap();
     let web3 = web3::Web3::new(transport);
 
-    let voting_abi = File::open("abi/VotingToChangeKeys.abi.json").expect("read voting abi");
-    let net_con_abi = File::open("abi/PoaNetworkConsensus.abi.json").expect("read consensus abi");
-    let val_meta_abi = File::open("abi/ValidatorMetadata.abi.json").expect("read val meta abi");
-    let key_mgr_abi = File::open("abi/KeysManager.abi.json").expect("read key mgr abi");
+    check_synced(&web3);
 
-    let voting_contract = ethabi::Contract::load(voting_abi)?;
-    let net_con_contract = ethabi::Contract::load(net_con_abi)?;
-    let val_meta_contract = ethabi::Contract::load(val_meta_abi)?;
-    let key_mgr_contract = ethabi::Contract::load(key_mgr_abi)?;
+    let voting_contract = voting::VotingToChangeKeys::default();
+    let net_con_contract = net_con::NetworkConsensus::default();
+    let val_meta_contract = val_meta::ValidatorMetadata::default();
+    let key_mgr_contract = key_mgr::KeysManager::default();
 
-    let val_meta_addr = util::parse_address(&contract_addrs.metadata_address).unwrap();
-    let web3_val_meta = web3::contract::Contract::new(web3.eth(), val_meta_addr, val_meta_contract);
-    let key_mgr_addr = util::parse_address(&contract_addrs.keys_manager_address).unwrap();
-    let web3_key_mgr = web3::contract::Contract::new(web3.eth(), key_mgr_addr, key_mgr_contract);
+    let val_meta_addr =
+        util::parse_address(&contract_addrs.metadata_address).expect("parse contract address");
+    let key_mgr_addr =
+        util::parse_address(&contract_addrs.keys_manager_address).expect("parse contract address");
 
-    let ballot_event = voting_contract.event("BallotCreated")?;
-    let vote_event = voting_contract.event("Vote")?;
-    let change_event = net_con_contract.event("ChangeFinalized")?;
-    let init_change_event = net_con_contract.event("InitiateChange")?;
+    let ballot_event = voting_contract.events().ballot_created();
+    let vote_event = voting_contract.events().vote();
+    let change_event = net_con_contract.events().change_finalized();
+    let init_change_event = net_con_contract.events().initiate_change();
 
     // Find all ballots and voter changes.
-    let ballot_or_change_filter = ethabi::TopicFilter {
-        topic0: ethabi::Topic::OneOf(vec![
-            ballot_event.signature(),
-            change_event.signature(),
-            init_change_event.signature(),
-        ]),
-        ..ethabi::TopicFilter::default()
-    }.to_filter_builder()
-        .build();
-    let ballot_change_logs_filter = web3.eth_filter()
-        .create_logs_filter(ballot_or_change_filter)
-        .wait()?;
+    let ballot_or_change_filter = (ballot_event.create_filter(None, None, None))
+        .or(change_event.create_filter())
+        .or(init_change_event.create_filter(None));
 
     // FIXME: Find out why we see no `ChangeFinalized` events, and how to obtain the initial voters.
-    let mut voters: Vec<ethabi::Address> = Vec::new();
+    let mut voters: Vec<Address> = Vec::new();
     let mut stats = Stats::default();
-    let mut prev_init_change: Option<InitiateChange> = None;
+    let mut prev_init_change: Option<net_con::logs::InitiateChange> = None;
+
+    vprintln!("Collecting events…");
+    let mut event_found = false;
 
     // Iterate over all ballot and voter change events.
-    for log in ballot_change_logs_filter.logs().wait()? {
-        if let Ok(change_log) = change_event.parse_log(log.clone().into_raw()) {
+    for log in ballot_or_change_filter.logs(&web3)? {
+        event_found = true;
+        if let Ok(change) = change_event.parse_log(log.clone().into_raw()) {
             // If it is a `ChangeFinalized`, update the current set of voters.
-            let change = ChangeFinalized::from_log(&change_log)?;
-            if verbose {
-                println!("{:?}", change);
-            }
+            vprintln!(
+                "• ChangeFinalized {{ new_set: {} }}",
+                HexList(&change.new_set)
+            );
             voters = change.new_set;
-        } else if let Ok(init_change_log) = init_change_event.parse_log(log.clone().into_raw()) {
+        } else if let Ok(init_change) = init_change_event.parse_log(log.clone().into_raw()) {
             // If it is an `InitiateChange`, update the current set of voters.
-            let init_change = InitiateChange::from_log(&init_change_log)?;
-            if verbose {
-                println!("{:?}", init_change);
-            }
+            vprintln!(
+                "• InitiateChange {{ parent_hash: {}, new_set: {} }}",
+                HexBytes(&init_change.parent_hash),
+                HexList(&init_change.new_set)
+            );
             if let Some(prev) = prev_init_change.take() {
+                let raw_call = util::raw_call(key_mgr_addr, web3.eth());
+                let get_voting_by_mining_fn = key_mgr_contract.functions().get_voting_by_mining();
                 voters = vec![];
                 for mining_key in prev.new_set {
-                    let voter = web3_key_mgr.simple_query("getVotingByMining", mining_key)?;
-                    if voter != ethabi::Address::zero() {
+                    let voter = get_voting_by_mining_fn.call(mining_key, &*raw_call)?;
+                    if voter != Address::zero() {
                         voters.push(voter);
                     }
                 }
             }
             prev_init_change = Some(init_change);
-        } else if let Ok(ballot_log) = ballot_event.parse_log(log.into_raw()) {
+        } else if let Ok(ballot) = ballot_event.parse_log(log.into_raw()) {
             // If it is a `BallotCreated`, find the corresponding votes and update the stats.
-            let ballot = BallotCreated::from_log(&ballot_log)?;
-            if verbose {
-                println!("{:?}", ballot);
-            }
-            let vote_filter = vote_event
-                .create_filter(ballot.vote_topic_filter())?
-                .to_filter_builder()
-                .build();
-            let vote_logs_filter = web3.eth_filter().create_logs_filter(vote_filter).wait()?;
-            let mut votes: Vec<Vote> = Vec::new();
-            for vote_log in vote_logs_filter.logs().wait()? {
-                let vote = Vote::from_log(&vote_event.parse_log(vote_log.into_raw())?)?;
-                if !voters.contains(&vote.voter) {
-                    if verbose {
-                        eprintln!("Unexpected voter {} for ballot {}", vote.voter, ballot.id);
+            vprintln!("• {:?}", ballot);
+            let votes = vote_event
+                .create_filter(ballot.id, None)
+                .logs(&web3)?
+                .into_iter()
+                .map(|vote_log| {
+                    let vote = vote_event.parse_log(vote_log.into_raw())?;
+                    if !voters.contains(&vote.voter) {
+                        vprintln!("  Unexpected voter {}", vote.voter);
+                        voters.push(vote.voter);
                     }
-                    voters.push(vote.voter);
-                }
-                votes.push(vote);
-            }
+                    Ok(vote)
+                })
+                .collect::<Result<Vec<_>, Error>>()?;
             stats.add_ballot(&voters, &votes);
         } else {
             return Err(ErrorKind::UnexpectedLogParams.into());
         }
     }
 
+    if !event_found {
+        return Err(ErrorKind::NoEventsFound.into());
+    }
+
+    vprintln!(""); // Add a new line between event log and table.
+
     // Finally, gather the metadata for all voters.
+    let raw_call = util::raw_call(val_meta_addr, web3.eth());
+    let get_mining_by_voting_key_fn = val_meta_contract.functions().get_mining_by_voting_key();
+    let validators_fn = val_meta_contract.functions().validators();
     for voter in voters {
-        let mining_key = web3_val_meta.simple_query("getMiningByVotingKey", voter)?;
-        let validator = web3_val_meta.simple_query("validators", mining_key)?;
+        let mining_key = match get_mining_by_voting_key_fn.call(voter, &*raw_call) {
+            Err(err) => {
+                eprintln!("Failed to find mining key for voter {}: {:?}", voter, err);
+                continue;
+            }
+            Ok(key) => key,
+        };
+        let validator = validators_fn.call(mining_key, &*raw_call)?.into();
         stats.set_metadata(&voter, mining_key, validator);
     }
     Ok(stats)
@@ -161,13 +188,11 @@ fn main() {
     let matches = cli::get_matches();
     let url = matches.value_of("url").unwrap_or("http://127.0.0.1:8545");
     let verbose = matches.is_present("verbose");
-    let contract_addrs = matches
+    let contract_file = matches
         .value_of("contracts")
-        .map(|filename| {
-            let file = File::open(filename).expect("open contracts file");
-            serde_json::from_reader(file).expect("parse contracts file")
-        })
-        .unwrap_or_default();
+        .unwrap_or("contracts/core.json");
+    let file = File::open(contract_file).expect("open contracts file");
+    let contract_addrs = serde_json::from_reader(file).expect("parse contracts file");
     let stats = count_votes(url, verbose, &contract_addrs).expect("count votes");
     println!("{}", stats);
 }
diff --git a/src/stats.rs b/src/stats.rs
index 01d7904..882098e 100644
--- a/src/stats.rs
+++ b/src/stats.rs
@@ -1,9 +1,9 @@
 use colored::{Color, Colorize};
 use ethabi::Address;
-use events::Vote;
 use std::collections::HashMap;
 use std::fmt::{self, Display, Formatter};
 use validator::Validator;
+use voting;
 
 /// The count of ballots and cast votes, as well as metadata for a particular voter.
 #[derive(Clone, Default)]
@@ -27,7 +27,7 @@ pub struct Stats {
 impl Stats {
     /// Adds a ballot: `voters` are the voting keys of everyone who was allowed to cast a vote, and
     /// `votes` are the ones that were actually cast.
-    pub fn add_ballot(&mut self, voters: &[Address], votes: &[Vote]) {
+    pub fn add_ballot(&mut self, voters: &[Address], votes: &[voting::logs::Vote]) {
         for voter in voters {
             let mut vs = self.voter_stats
                 .entry(voter.clone())
diff --git a/src/util.rs b/src/util.rs
index 4f6cc26..d49cb81 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,75 +1,124 @@
-use ethabi;
-use std::u8;
+use ethabi::{self, Address, Bytes};
+use std::str::FromStr;
+use std::{fmt, u8};
 use web3;
 use web3::futures::Future;
 
 // TODO: Evaluate whether any of these would make sense to include in `web3`.
 
-/// Converts the bytes to a string, interpreting them as null-terminated UTF-8.
-pub fn bytes_to_string(bytes: &[u8]) -> String {
-    let zero = bytes
-        .iter()
-        .position(|b| *b == 0)
-        .unwrap_or_else(|| bytes.len());
-    String::from_utf8_lossy(&bytes[..zero]).to_string()
-}
-
 /// Parses the string as a 40-digit hexadecimal number, and returns the corresponding `Address`.
-pub fn parse_address(mut s: &str) -> Option<ethabi::Address> {
-    let mut bytes = [0u8; 20];
+pub fn parse_address(mut s: &str) -> Option<Address> {
     if &s[..2] == "0x" {
         s = &s[2..];
     }
-    for i in 0..20 {
-        match u8::from_str_radix(&s[(2 * i)..(2 * i + 2)], 16) {
-            Ok(b) => bytes[i] = b,
-            Err(_) => return None,
+    Address::from_str(s).ok()
+}
+
+/// Returns a wrapper of a contract address, to make function calls using the latest block.
+pub fn raw_call<T: web3::Transport + 'static>(
+    to: Address,
+    eth: web3::api::Eth<T>,
+) -> Box<Fn(Bytes) -> Result<Bytes, String>> {
+    Box::new(move |bytes: Bytes| -> Result<Bytes, String> {
+        let req = web3::types::CallRequest {
+            from: None,
+            to,
+            gas: None,
+            gas_price: None,
+            value: None,
+            data: Some(bytes.into()),
+        };
+        eth.call(req, Some(web3::types::BlockNumber::Latest))
+            .wait()
+            .map(|bytes| bytes.0)
+            .map_err(|err| err.to_string())
+    })
+}
+
+trait TopicExt<T> {
+    /// Returns the union of the two topics.
+    fn or(self, other: Self) -> Self;
+
+    /// Converts this topic into an `Option<Vec<T>>`, where `Any` corresponds to `None`,
+    /// `This` to a vector with one element, and `OneOf` to any vector.
+    fn to_opt_vec(self) -> Option<Vec<T>>;
+}
+
+impl<T: Ord> TopicExt<T> for ethabi::Topic<T> {
+    fn or(self, other: Self) -> Self {
+        match (self.to_opt_vec(), other.to_opt_vec()) {
+            (Some(mut v0), Some(v1)) => {
+                for e in v1 {
+                    if !v0.contains(&e) {
+                        v0.push(e);
+                    }
+                }
+                if v0.len() == 1 {
+                    ethabi::Topic::This(v0.into_iter().next().expect("has a single element; qed"))
+                } else {
+                    ethabi::Topic::OneOf(v0)
+                }
+            }
+            (_, _) => ethabi::Topic::Any,
         }
     }
-    Some(ethabi::Address::from_slice(&bytes))
-}
 
-pub trait ContractExt {
-    fn simple_query<P, R>(&self, func: &str, params: P) -> Result<R, web3::contract::Error>
-    where
-        R: web3::contract::tokens::Detokenize,
-        P: web3::contract::tokens::Tokenize;
-}
-
-impl ContractExt for web3::contract::Contract<web3::transports::Http> {
-    /// Calls a constant function with the latest block and default parameters.
-    fn simple_query<P, R>(&self, func: &str, params: P) -> Result<R, web3::contract::Error>
-    where
-        R: web3::contract::tokens::Detokenize,
-        P: web3::contract::tokens::Tokenize,
-    {
-        self.query(
-            func,
-            params,
-            None,
-            web3::contract::Options::default(),
-            web3::types::BlockNumber::Latest,
-        ).wait()
+    fn to_opt_vec(self) -> Option<Vec<T>> {
+        match self {
+            ethabi::Topic::Any => None,
+            ethabi::Topic::OneOf(v) => Some(v),
+            ethabi::Topic::This(t) => Some(vec![t]),
+        }
     }
 }
 
 pub trait TopicFilterExt {
     /// Returns a `web3::types::FilterBuilder` with these topics, starting from the first block.
     fn to_filter_builder(self) -> web3::types::FilterBuilder;
+
+    /// Returns the "disjunction" of the two filters, i.e. it filters for everything that matches
+    /// at least one of the two in every topic.
+    fn or(self, other: ethabi::TopicFilter) -> ethabi::TopicFilter;
+
+    /// Returns the vector of logs that match this filter.
+    fn logs<T: web3::Transport>(
+        self,
+        web3: &web3::Web3<T>,
+    ) -> Result<Vec<web3::types::Log>, web3::error::Error>;
 }
 
 impl TopicFilterExt for ethabi::TopicFilter {
     fn to_filter_builder(self) -> web3::types::FilterBuilder {
         web3::types::FilterBuilder::default()
             .topics(
-                to_topic(self.topic0),
-                to_topic(self.topic1),
-                to_topic(self.topic2),
-                to_topic(self.topic3),
+                self.topic0.to_opt_vec(),
+                self.topic1.to_opt_vec(),
+                self.topic2.to_opt_vec(),
+                self.topic3.to_opt_vec(),
             )
             .from_block(web3::types::BlockNumber::Earliest)
             .to_block(web3::types::BlockNumber::Latest)
     }
+
+    fn or(self, other: ethabi::TopicFilter) -> ethabi::TopicFilter {
+        ethabi::TopicFilter {
+            topic0: self.topic0.or(other.topic0),
+            topic1: self.topic1.or(other.topic1),
+            topic2: self.topic2.or(other.topic2),
+            topic3: self.topic3.or(other.topic3),
+        }
+    }
+
+    fn logs<T: web3::Transport>(
+        self,
+        web3: &web3::Web3<T>,
+    ) -> Result<Vec<web3::types::Log>, web3::error::Error> {
+        web3.eth_filter()
+            .create_logs_filter(self.to_filter_builder().build())
+            .wait()?
+            .logs()
+            .wait()
+    }
 }
 
 pub trait Web3LogExt {
@@ -82,50 +131,51 @@ impl Web3LogExt for web3::types::Log {
     }
 }
 
-/// Converts an `ethabi::Topic<T>` into an `Option<Vec<T>>`, where `Any` corresponds to `None`,
-/// `This` to a vector with one element, and `OneOf` to any vector.
-fn to_topic<T>(topic: ethabi::Topic<T>) -> Option<Vec<T>> {
-    match topic {
-        ethabi::Topic::Any => None,
-        ethabi::Topic::OneOf(v) => Some(v),
-        ethabi::Topic::This(t) => Some(vec![t]),
+/// Wrapper for a byte array, whose `Display` implementation outputs shortened hexadecimal strings.
+pub struct HexBytes<'a>(pub &'a [u8]);
+
+impl<'a> fmt::Display for HexBytes<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "0x")?;
+        for i in &self.0[..2] {
+            write!(f, "{:02x}", i)?;
+        }
+        write!(f, "…")?;
+        for i in &self.0[(self.0.len() - 2)..] {
+            write!(f, "{:02x}", i)?;
+        }
+        Ok(())
     }
 }
 
-pub trait LogExt {
-    /// Returns the `i`-th parameter, if it has the given name, otherwise `None`.
-    fn param(&self, i: usize, name: &str) -> Option<&ethabi::Token>;
+/// Wrapper for a list of byte arrays, whose `Display` implementation outputs shortened hexadecimal
+/// strings.
+pub struct HexList<'a, T: 'a>(pub &'a [T]);
 
-    /// Returns the `i`-th parameter, if it is an `Address` and has the given name, otherwise
-    /// `None`.
-    fn address_param(&self, i: usize, name: &str) -> Option<&ethabi::Address>;
-
-    /// Returns the `i`-th parameter, if it is a `Uint` and has the given name, otherwise `None`.
-    fn uint_param(&self, i: usize, name: &str) -> Option<&ethabi::Uint>;
-}
-
-impl LogExt for ethabi::Log {
-    fn param(&self, i: usize, name: &str) -> Option<&ethabi::Token> {
-        self.params.get(i).and_then(|param| {
-            if param.name == name {
-                Some(&param.value)
-            } else {
-                None
+impl<'a, T: 'a> fmt::Display for HexList<'a, T>
+where
+    T: AsRef<[u8]>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "[")?;
+        for (i, item) in self.0.iter().enumerate() {
+            if i > 0 {
+                write!(f, ", ")?;
             }
-        })
-    }
-
-    fn address_param(&self, i: usize, name: &str) -> Option<&ethabi::Address> {
-        match self.param(i, name) {
-            Some(&ethabi::Token::Address(ref address)) => Some(address),
-            _ => None,
-        }
-    }
-
-    fn uint_param(&self, i: usize, name: &str) -> Option<&ethabi::Uint> {
-        match self.param(i, name) {
-            Some(&ethabi::Token::Uint(ref i)) => Some(i),
-            _ => None,
+            write!(f, "{}", HexBytes(item.as_ref()))?;
         }
+        write!(f, "]")
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_parse_address() {
+        let addr_str = "0x2b1dbc7390a65dc40f7d64d67ea11b4d627dd1bf";
+        let addr = super::parse_address(addr_str).expect("parse address with 0x");
+        let addr2 = super::parse_address(&addr_str[2..]).expect("parse address without 0x");
+        assert_eq!(addr, addr2);
+        assert_eq!(addr_str, &format!("{:?}", addr));
     }
 }
diff --git a/src/validator.rs b/src/validator.rs
index b4ebe1e..c589da4 100644
--- a/src/validator.rs
+++ b/src/validator.rs
@@ -1,6 +1,4 @@
-use ethabi::Token;
-use util;
-use web3::contract::{tokens, Error, ErrorKind};
+use ethabi;
 
 /// Validator metadata.
 #[derive(Clone, Debug)]
@@ -17,17 +15,28 @@ pub struct Validator {
     // uint256 minThreshold,
 }
 
-impl tokens::Detokenize for Validator {
-    /// Returns a `Validator` if the token's types match the fields.
-    fn from_tokens(tokens: Vec<Token>) -> Result<Validator, Error> {
-        match (tokens.get(0), tokens.get(1)) {
-            (Some(&Token::FixedBytes(ref first)), Some(&Token::FixedBytes(ref last))) => {
-                Ok(Validator {
-                    first_name: util::bytes_to_string(first),
-                    last_name: util::bytes_to_string(last),
-                })
-            }
-            _ => Err(ErrorKind::InvalidOutputType("Validator".to_string()).into()),
+type ValidatorTuple = (
+    ethabi::Hash,
+    ethabi::Hash,
+    ethabi::Hash,
+    String,
+    ethabi::Hash,
+    ethabi::Hash,
+    ethabi::Uint,
+    ethabi::Uint,
+    ethabi::Uint,
+    ethabi::Uint,
+);
+
+impl From<ValidatorTuple> for Validator {
+    fn from((first_name_h, last_name_h, ..): ValidatorTuple) -> Validator {
+        Validator {
+            first_name: String::from_utf8_lossy(&*first_name_h)
+                .to_owned()
+                .to_string(),
+            last_name: String::from_utf8_lossy(&*last_name_h)
+                .to_owned()
+                .to_string(),
         }
     }
 }