Extrinsic 20674-1

{
  "heartbeat": {
    "blockNumber": 20672,
    "sessionIndex": 344,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x386f0de2aee6303ce113a47e3bfc16e72ee9e9cf6082377a9091f45eef9e32471fb8ef794b83a503f5274c88513c8e9bca8ed5da18e04b92740b38e66944238a"
}