Extrinsic 3997-1

{
  "heartbeat": {
    "blockNumber": 3996,
    "sessionIndex": 66,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x0e9ae6e15ec63c32dd7833c864e9a80bb0f1c1e833c2bdc2dbbc2526c49d5f5c11730e1d87499501b4e55dd7c1d753bead55d4090a4e672d42604509d65c2188"
}