Extrinsic 2738-1

{
  "heartbeat": {
    "blockNumber": 2737,
    "sessionIndex": 45,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x7ac894c1ed93202bd8c87597013d8351b41ab413510dc57fe72ab7beae5c0558cdc30c2d3c5752931fb5f59f60dc564a6303515614c350406a5f274b64ffa68b"
}