{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896450499",
    "entityType": "Track",
    "nonce": "0x63b01f633b46c6804bd018dbe033b55e83fb1947fe979340d56e3c057ab22a94",
    "signature": "0xbaf3ff222b1cdc0ef7b07886e925db0b48e2e91a9810f3d9c695ba9579bb661024271bfa6d096e6d571708ba82f624c9ceb2af543efabb638bd2fed115645a951b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}