README.md

Golang Ethereum staking with Builder Vault wallet

sequenceDiagram
    autonumber
    participant StakeClient as Sample stake<br> client application
    participant StakeAPI as Stake Intent API
    participant Blockchain as Blockchain RPC API
    box Builder Vault
      participant TSM1 as MPC Wallet <br>(private key share 1)
      participant TSM2 as MPC Wallet <br>(private key share 2)
    end

    StakeClient ->> StakeAPI: get StakeIntent unsigned tx data <br>(amount, withdrawal & recipient address)
    StakeClient ->> Blockchain: get blockchain inputs (gas, nonce) for new tx<br>(sender wallet)
    StakeClient ->> StakeClient: construct unsigned tx
    StakeClient ->> TSM1: request signature (unsigned tx)
    TSM1 -->> StakeClient: return partial signature
    StakeClient ->> TSM2: request signature (unsigned tx)
    TSM2 -->> StakeClient: return partial signature
    StakeClient ->> StakeClient: combine partial signatures
    StakeClient ->> Blockchain: broadcast signed tx<br>(signed tx, deposit contract)

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Prerequisites

• Golang or launch in code-spaces
• Register for a demo Builder Vault tenant: https://www.blockdaemon.com/get-started/builder-vault-sandbox-registration
  • Download SDK bundle provided in registration email (extract authentication certificates)
  • Place Builder Vault authentication certificate key-pair client.crt & client.key in this nodejs folder
• Register for free Blockdaemon RPC API key and set in .env as BLOCKDAEMON_API_KEY
• Register for free Blockdaemon Staking API key and set in .env as BLOCKDAEMON_STAKE_API_KEY

Step 1. Set environment variables in .env

cd ethereum-staking/buildervault/golang/
cp .env.example .env

• update .env with API keys

Step 2. Launch main.go to auto-create the Builder Vault wallet address on first run

go run main.go

• note, on first run this step will fail as the wallet address has no funds
• copy the new Ethereum wallet address and fund the account

Step 3. Fund the new Ethereum wallet address with 33 ETH using faucets below

• https://holesky-faucet.pk910.de/#/

Step 4. Launch main.go to generate the Stake Intent request, sign the request with BuilderVault and broadcast the transaction

go run main.go

• (optional) decode the raw signed transaction to inspect the Blockdaemon provided attributes (https://rawtxdecode.in)
• observe the confirmed transaction through the generated blockexplorer link