{
  "manageEntity": {
    "action": "Save",
    "entityId": "407139",
    "entityType": "Track",
    "nonce": "0xa62a74a016ad8ab94b2e6e94a8e1db020df908ee91e10e46fc85b3d68fe0a4c9",
    "signature": "0x88aa75fdec5598a9cd1d2ad685aaf69c2ecfadb2c00eb337e300c46f3f6aba5c0ab1412ec3265034a72709137603cada5455e0612218331f4dbee68bea9825751b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}