Extrinsic 19301-1

{
  "heartbeat": {
    "blockNumber": 19300,
    "sessionIndex": 321,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x86a4c455366c14621843dfb79bb7a4c0fcde2ed7c772796e6d72d09db5ba2e2e3941f9ef92e06c62f50452a199efc28877a63d3992b26f64d42cd2a88c163387"
}