Extrinsic 15622-1

{
  "heartbeat": {
    "blockNumber": 15620,
    "sessionIndex": 260,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x6020ae888af429e6b93bf79988345f5dae38925126d9384a867f262e1b7121252e9c28bb3d631af4d95858187a293a3c749b9fd3523da93ef0aa6183ef4e648f"
}