Extrinsic 73-1

{
  "heartbeat": {
    "blockNumber": 72,
    "sessionIndex": 1,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xb6e7abbcd9e9e36155d82f2db6edb210d80080deaaeff6ed32f05c868cc3e71818d6b8f96962055a0e47c7591bd2f2bf3409b52e6a645e5977501a32193a4a83"
}