Extrinsic 20328-1

{
  "heartbeat": {
    "blockNumber": 20327,
    "sessionIndex": 338,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb073d477ad342d04f6092b129307ef85bc247533ef7ddb0c5c78674912593d4ce60e71d89c70f203d94b4049c0c4ef3ce5adc1b26038ddfba4c26263dbd8ea87"
}