Extrinsic 19890-1

{
  "heartbeat": {
    "blockNumber": 19888,
    "sessionIndex": 331,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x48b75db837fd0fc9b6459f81f0fbf66d067da715a3cbcdc94554e62a26895366340ff3f536dfce8ce6b1ffc0c78138075a9423ecf63f58dd7c62761f89692480"
}