{
  "manageEntity": {
    "action": "Save",
    "entityId": "574135",
    "entityType": "Track",
    "nonce": "0x5fef02bb929de27a2ee32bd4a92897b287a39a04b64ecfaf1003ee50f2ffe283",
    "signature": "0x996f84f74c1341e9d7b3756f874b97364908d9638c0630f9df6a93baf286a87c7062188e9ef4728ae9009c35c31ab19c8e182ed3e8bca8314e3974c3ad61c13e1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}