{
  "manageEntity": {
    "action": "Save",
    "entityId": "55209",
    "entityType": "Track",
    "nonce": "0x8799ec075121cb6a8fc8a26d6edf2080565c7e1075004f36cc9d0efdc6477980",
    "signature": "0x3fc8f0c54e150941b7a195d28a1f78343d1750d381da222bec5dd50aaddc11ca5415dcb81fd10b89a7b43335b0abf7ea85b20a32f0e2c01eb3994ae6a938a2801b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}