Extrinsic 3434-1

{
  "heartbeat": {
    "blockNumber": 3432,
    "sessionIndex": 57,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x605acf4135f7f7083bf57781ea30e75d4dd757c8c4c3a6548d319a207c946a47c522b572920a5889421da96a0646ed1bf45215b554b95ed47568bf0a3116ab81"
}