Extrinsic 18629-1

{
  "heartbeat": {
    "blockNumber": 18628,
    "sessionIndex": 310,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x8cf0c7423e730c59f3168935962763df962db566d350f68d0597b6436b74603da6ac38274f2faed118f5e023876937c0896d8df7d1b4d295d69b22968b7f5883"
}