{
  "manageEntity": {
    "action": "Save",
    "entityId": "1688359289",
    "entityType": "Track",
    "nonce": "0xcb88431fef3f519f97c85af9bf855078e2c075931682ca2e8603a9dd8bd50e83",
    "signature": "0xfd1c8d8054322e22bd05332405d586a5acce0d4bb13d8d2d0e020562af187b6d19894b5dee65aec919a389ff954126f1cbd4799602963df6d49e97a04926c2941b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}