{
  "manageEntity": {
    "action": "Save",
    "entityId": "856520",
    "entityType": "Track",
    "nonce": "0xb506b9925e2fadf362cb82fce85215288c7f8bd356203d27184bc9903b452c42",
    "signature": "0xfc0a6441edb062e47c833c508267d9a5d4acbfa7224c40f95cfac30305f0ac5369cb41b7a6b94711b9c87f721332e4b0fd92924e89089479e43e95cc9df405d11c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}