Extrinsic 26868-1

{
  "heartbeat": {
    "blockNumber": 26866,
    "sessionIndex": 447,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x50397f611d6eb46e42e4e36ed7d211d6dbe57421fd987bd9798fc67ce4d2e024129159ef7747c4c89cd51b37103d0f97f3c96ab9e340210c3186212a5bda2c83"
}