Extrinsic 21973-1

{
  "heartbeat": {
    "blockNumber": 21971,
    "sessionIndex": 366,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xdeaf2fc2a3e9583f8f73d157f65dfecd2963b78d79cfd0dc4675da30ecc89d48903d8b54550be108f68e7f496833c6867f65db9361eb6d706ab1a05f98077a87"
}