Extrinsic 1525-1

{
  "heartbeat": {
    "blockNumber": 1524,
    "sessionIndex": 25,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x764d60f559d1eba0d94bf95a02a9ec439509006b78738c07456124e0d9a57b51fb2ab4a8bc9e8ff870d60b2af468fc4eefaa0cdd6bcb1c47ba8cb1e6329b9d82"
}