Extrinsic 18345-1

{
  "heartbeat": {
    "blockNumber": 18344,
    "sessionIndex": 305,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x30db3f25c6a0e46af19874acc20aa83d2b458d26ffc6974450dd770591e7934f9c3227ca9ab5876c6d8a8e98c827ad09fe7e98307f2823630c4e3d52595b9e82"
}