{
  "manageEntity": {
    "action": "Save",
    "entityId": "666131",
    "entityType": "Track",
    "nonce": "0xe1c2231e33030d05cddbc364758cddb85aabdc979fa31fdd31be402b5d0f7b01",
    "signature": "0x8ef8cc409a8edb688b578c47af3704d10aa33c407f4834119a18b71f2685a6e04d048a7cf0b4afea4692aa7344eb88832fbe938edc09b8f2e749427019aab9861c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}