Extrinsic 15701-2

{
  "heartbeat": {
    "blockNumber": 15699,
    "sessionIndex": 261,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x5c2d07341eb91ff9899012a44510121578eef5ef0656af989cfd731744c13d58a20a93fb8cfaddbda7c4fa7147d01a931aef2f5a28a10bdb4931fc504e8ba884"
}