Extrinsic 16989-2

{
  "heartbeat": {
    "blockNumber": 16988,
    "sessionIndex": 283,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x4a2165ff7762a869efe408e2d201bd8af182d8500a929c598c4d5d41c840db4a0690701facbf4e48ae474bd1666c91ae4879f896cd828d4758385fb5789e3583"
}