Extrinsic 3701-1

{
  "heartbeat": {
    "blockNumber": 3700,
    "sessionIndex": 61,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x3e3fb42078a4358b178b85642aeab64471cb6bc1f7e20db998743fabac36d038db4ce9b0c2419624694f4970d91a358c324de2e7baef8498759af00ca907958d"
}