Extrinsic 21075-1

{
  "heartbeat": {
    "blockNumber": 21074,
    "sessionIndex": 351,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x00afda7f4db4f810afa58faba2f1379396341de5414baaaf249a1a2d56e7ef3db034c4693b42a3046bdbf4180b661517eab88bfa17d724546047f7d1e816f782"
}