Extrinsic 680-1

{
  "heartbeat": {
    "blockNumber": 679,
    "sessionIndex": 11,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x96ff8bc6bbbb8f0c38f326a296a5f7efbf11776bbff1c72fcdd7f03cb9417a7b8d49a7855b45e91709c9e7da21d20cda0193f2d149bf4d1cf066a1e56ce73c89"
}