Extrinsic 12876-1

{
  "heartbeat": {
    "blockNumber": 12874,
    "sessionIndex": 214,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x00c0711f1b8d6b252b3e9587579a60dc9d45c8a3c9d0ce32de5ccc84f3271e24a2f51018d9e6d671346e6199f306fd6cfbdc9fceef982959a110f22eb8b1f685"
}