docs: testnet instructions

HowTo.md

@@ -122,7 +122,7 @@ $ ./dc4bc_d gen_keys --username john_doe --key_store_dbdsn /tmp/dc4bc_john_doe_k
 ```
 Start the node (note the `--storage_topic` flag — use a fresh topic for cleaner test runs):
 ```
-$ ./dc4bc_d start --username john_doe --key_store_dbdsn /tmp/dc4bc_john_doe_key_store --listen_addr localhost:8080 --state_dbdsn /tmp/dc4bc_john_doe_state --storage_dbdsn 94.130.57.249:9092 --producer_credentials producer:producerpass --consumer_credentials consumer:consumerpass --kafka_truststore_path /path/to/ca.crt --storage_topic test_topic
+$ ./dc4bc_d start --username john_doe --key_store_dbdsn /tmp/dc4bc_john_doe_key_store --listen_addr localhost:8080 --state_dbdsn /tmp/dc4bc_john_doe_state --storage_dbdsn 94.130.57.249:9093 --producer_credentials producer:producerpass --consumer_credentials consumer:consumerpass --kafka_truststore_path ./ca.crt --storage_topic test_topic
 ```
 Start the airgapped machine:
 ```

TESTNET_CLIENT_PREP_GUIDE.md

@@ -0,0 +1,67 @@
+# Preparing for the testnet dkg ceremony
+
+## Prepare the hardware
+
+To do things properly, you'll need two machines (either Linux or OS X ones). One should have internet access ("client"), and the other would be working offline ("airgapped"). Both machines should have webcams attached, as transactions and their signed versions would be transmitted via qr-codes
+
+## Install the dependencies
+
+You'll need to prepare `go` and `opencv`. To get them ready, check out the `installation` guide here: https://github.com/lidofinance/dc4bc/blob/master/HowTo.md#step-by-step-guide
+
+## Build the cli apps
+
+Clone the git repo https://github.com/lidofinance/dc4bc and build the app for your client and airgapped machines following guides for their OS
+
+**Note**: further in this guide we'll refer to `dc4bc_...` apps. You should run `dc4bc_..._linux` if you've built apps on Linux or `dc4bc_..._darwin` if you're on OS X
+
+## Generate keypairs
+
+You'll need to use apps to generate keypairs. Public keys from those keypair should be submitted to Lido's repo on the next step.
+
+Run the command `gen_keys`:
+```
+./dc4bc_d gen_keys --username john_doe --key_store_dbdsn /tmp/dc4bc_john_doe_key_store
+```
+Here:
+1) Username is your desired username (one you've submitted to doc https://docs.google.com/spreadsheets/d/1h3cWJUm3ZfaX7a2GWbKitzqLEEtg5KGrr-4E4eFQkbY/edit#gid=0)
+
+## Start the node communicating with Kafka for testnet
+
+On the client machine, run the command `start`:
+```
+./dc4bc_d start --username john_doe --key_store_dbdsn /tmp/dc4bc_john_doe_key_store --listen_addr localhost:8080 --state_dbdsn /tmp/dc4bc_john_doe_state --storage_dbdsn 94.130.57.249:9093 --producer_credentials producer:producerpass --consumer_credentials consumer:consumerpass --kafka_truststore_path ./ca.crt --storage_topic test_topic
+```
+
+Here:
+1) `--username john_doe` — pass your username there
+2) `--storage_dbdsn 94.130.57.249:9093` — it's the address of Kafka node we're be using for testnet launch
+3) `--kafka_truststore_path ./ca.crt` specifies self-signed certificate we're be using for testnet launch
+
+Let this process run.
+
+## Select public keys and submit them to ceremony data repo
+
+On the client machine run the command `get_pubkey`:
+```
+./dc4bc_cli get_pubkey --listen_addr localhost:8080
+```
+
+On the airgapped machine start the console with
+```
+./dc4bc_airgapped --db_path /tmp/dc4bc_john_doe_airgapped_state --password_expiration 10m
+```
+And run the command `show_dkg_pubkey`:
+```
+>>>> show_dkg_pubkey
+```
+
+Grab the output of both commands and submit it as a pull request to the file [dc4bc-conference-call-25-11-2020.json](https://github.com/lidofinance/dc4bc-conference-call/blob/master/dc4bc-conference-call/dc4bc-conference-call-25-11-2020.json) in the ceremony repo https://github.com/lidofinance/dc4bc-conference-call. Check the format in the repo's `README.md`
+
+## Check airgapped machine communication capabilities
+
+The client and the airgapped machines communicate with the qr-codes. To check airgapped machine is ready, run the command `read_qr` in the airgapped console:
+```
+>>>> read_qr
+```
+
+If you're seeing window with videostream from the airgapped machine's webcam — you're all set

ca.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+tEwkFsLeF9vTyck=
+-----END CERTIFICATE-----