Extrinsic 18580-1

{
  "heartbeat": {
    "blockNumber": 18579,
    "sessionIndex": 309,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x3a6b2d181c4261918fb5610b24c4e371b022b22415a951c9c3161ce81c08a02a8dbf43b740152413e1f9aecb25d7d3d2fae0c97a7df83fd007198e00e2755481"
}