Extrinsic 12941-1

{
  "heartbeat": {
    "blockNumber": 12939,
    "sessionIndex": 215,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xdc5c35016aa970b4e56876803c619d6a1ca85d62b9ae994fa80e969593dd4f69f1e649ca59ef22b5b40b6ed6c1a1ab17c1e1d0003844d260d8840d81dd738485"
}