{
  "manageEntity": {
    "action": "Save",
    "entityId": "44231297",
    "entityType": "Track",
    "nonce": "0x458a1a92f6c960ab0fa2b4d401f5ae49dc27727164da9d23ccb4c3d69632c192",
    "signature": "0x0d7ff7369f0e004a2c0cc87fe92c52fb6b770bd871b0c4cef3315fa05e24619d1070b8ade9686d12ba46fc077a4b4dae67c0d9c67ca10e87abcba63204b0cf0f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}