Extrinsic 13221-1

{
  "heartbeat": {
    "blockNumber": 13219,
    "sessionIndex": 220,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x581fd234d069a90ccde48092f0fdcf45c7b6408f8d624cc062e11800068a450bbd469e756f44505746ef6d537f35a48aa1dd929bced418419e5ccc5919ef9380"
}