{
  "manageEntity": {
    "action": "Save",
    "entityId": "336519",
    "entityType": "Track",
    "nonce": "0x529b7fb903e2121c62412525ff7d261a103be55d9a6a208142f7d3cfd6dd3428",
    "signature": "0x4741203326bb9b537a44a94b009907b6f97ea82c3a9cf05ead5cf97d47bff73d39b92e86962c1285ef56b50594fce86cb9d87aa3d25054ada63f1b5d5fbf45c21c",
    "signer": "0x990Efee96276569Be96c8776E58B60Eb951DA8f8",
    "userId": "67349"
  }
}