Extrinsic 18762-1

{
  "heartbeat": {
    "blockNumber": 18760,
    "sessionIndex": 312,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x26101b4b5fd8e936e039cc7aaf01f073e9beacb1a14443f46909c595d0fb1c2edd232f129b95ae0d152bc25f1d670a31d119228583cddb3857214b40a8e6f881"
}