Extrinsic 15674-1

{
  "heartbeat": {
    "blockNumber": 15672,
    "sessionIndex": 261,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x26e1f24076ffc710b53abc924798536657cb3767e10c4a82cc54ab807986525f958775b0ea354f2cc06ec21c1b6240cb18aa0dd63db925702c52b3a14221448e"
}