Extrinsic 18139-1

{
  "heartbeat": {
    "blockNumber": 18137,
    "sessionIndex": 302,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x760bb2e9b32e5bcce87a6456cb28f0f3ca755eb1e823ff979e80b6ae593aba22b6c7da87a8fb955986187d0c7abe7db4c125497dcc5841d73e59d5d949de5f86"
}