Extrinsic 20713-1

{
  "heartbeat": {
    "blockNumber": 20712,
    "sessionIndex": 345,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xb49653da27e97a795a08938ead26e1af4bdd7a0a89e0afba0dbf86f26f79a25093bc36e7efe41703d4e66798276d942d8fccf8ceeac26e74d53db4c6c52dac8d"
}