Extrinsic 20678-1

{
  "heartbeat": {
    "blockNumber": 20677,
    "sessionIndex": 344,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xa4e63a0e146476495339bad66abf6365d597b6c74275a3efe0e01670d3c56a7df90864e3c32063b3c95869448a8f4bca52c3298d6dd5a78cd0f10b66034cdf8c"
}