Pull in secp256k1 wrapper crate as a dep

Cargo.lock

@@ -226,9 +226,9 @@ checksum = "e6e9e01327e6c86e92ec72b1c798d4a94810f147209bbe3ffab6a86954937a6f"
 
 [[package]]
 name = "cc"
-version = "1.0.50"
+version = "1.0.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
+checksum = "8dae9c4b8fedcae85592ba623c4fd08cfdab3e3b72d6df780c6ead964a69bfff"
 
 [[package]]
 name = "cfg-if"
@@ -1403,6 +1403,24 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
 
+[[package]]
+name = "secp256k1"
+version = "0.17.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2932dc07acd2066ff2e3921a4419606b220ba6cd03a9935123856cc534877056"
+dependencies = [
+ "secp256k1-sys",
+]
+
+[[package]]
+name = "secp256k1-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ab2c26f0d3552a0f12e639ae8a64afc2e3db9c52fe32f5fc6c289d38519f220"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "secrecy"
 version = "0.6.0"
@@ -2016,6 +2034,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "redjubjub",
+ "secp256k1",
  "sha2",
  "thiserror",
 ]

zebra-chain/Cargo.toml

@@ -13,6 +13,7 @@ chrono = "0.4"
 futures = "0.3"
 hex = "0.4"
 lazy_static = "1.4.0"
+secp256k1 = "0.17.2"
 sha2 = "0.8"
 thiserror = "1"
 # ZF deps