{
  "manageEntity": {
    "action": "Save",
    "entityId": "634449",
    "entityType": "Track",
    "nonce": "0x5e60725ae8484d324338a90589e882cfd97424ca2c6d2e12bade5e8d51c47b67",
    "signature": "0x2896e0f6a4b3cb93a9558de6df6afa1e588efc83eb562c2319fd143fbf0d3d4547a70f9319b9b660041e18b5e7e7ed642145c54745e56c261fc226c8a14b40031c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}