{
  "manageEntity": {
    "action": "Save",
    "entityId": "561440349",
    "entityType": "Track",
    "nonce": "0xfca3059195593f5fc18a9cd7d3918c71d2fe857fffc15ac70ed60693b5545ce5",
    "signature": "0xafc831b1d286eecc2d9e71f0c6d9ce2fb1bfd292488aba6dcf520376ee7e3e1334fc2ba5ccd2ccf99324fa43ed94f4e21c5ccb8de9e08dd74174121cce1ebc091c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}