Extrinsic 16004-1

{
  "heartbeat": {
    "blockNumber": 16003,
    "sessionIndex": 266,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x42a2e8ddf3fe99fdb1b25ba681e3ce65eb51f422895c2fdeccdc2938216ad55991c6c8ea3e046e468637508bb7c8dd42045b80bf116cb1c3bfc51a895546ce8b"
}