Extrinsic 20647-1

{
  "heartbeat": {
    "blockNumber": 20645,
    "sessionIndex": 344,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xf6b01dfcb2137da55186fd0381a4e306d48f25733fe3bb48f35ea7039b892a508ae4c78f7fcd56796ab58022b8ffc402a95ed51cc412aea451682907478baf89"
}