{
  "manageEntity": {
    "action": "Save",
    "entityId": "954470",
    "entityType": "Track",
    "nonce": "0x3a9f3b1dfbdb76e31840b1ca6bba7d31662de21c0668e9622e0315d91f89ddf4",
    "signature": "0x9db9f4f2d80e55505937b80ebe76093881f823d01a6cc72f469cb7da116dc8894451cbb9955f59ed5cd18d204bbbfc9e8f765426dfbd10f0e7134528ed1be6951c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}