Extrinsic 1775-1

{
  "heartbeat": {
    "blockNumber": 1774,
    "sessionIndex": 29,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x42e96e6ee5414a27b922b2c13f7eb9976fa4ab0d35ca0051ee90b100615ccd1e3100880a604fa21dbbe7eb55fc3a25b48a1a1fcae8c101e1f4d3c8109f4c3e8b"
}