Extrinsic 945-1

{
  "heartbeat": {
    "blockNumber": 944,
    "sessionIndex": 15,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xbc851ee904057120595d403e262602aa439777f5365e8a4405a8f713ec27ff4b2e29bf8a31b71d88589abbbf0efab94337d0eb95e7e452ff7867a7256ec7fd83"
}