Extrinsic 20667-1

{
  "heartbeat": {
    "blockNumber": 20665,
    "sessionIndex": 344,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x0039298425707c8dfd67d54a10a89df8eedb26c19b79dc4a15515847c828fc3b69972717dea8309e0efd2f9637c8300ebef667ed7254ee2e988da72fd9172c8b"
}