Extrinsic 17920-1

{
  "heartbeat": {
    "blockNumber": 17918,
    "sessionIndex": 298,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xfcb935f7629491c360cc9fb58bbe6342ad3eff652b1a02ca6d9f552db4999340a8f532148166f4192f36ad2a50e3106b0a1f50dc040e6b8fb549ae5711152288"
}