{
  "manageEntity": {
    "action": "Save",
    "entityId": "210703",
    "entityType": "Track",
    "nonce": "0x8f70bf2cd488e02e8ad4c6c3cf0fcc22f2fb25ff98ddaf47b2e5067cbf85f1da",
    "signature": "0x305a79b55b3087ed4f3bf6738581b9b8cdf94c269c449185e8993bc36357f6c051d00c5a3fd43773d9159b453cd4f7456c7cfe045bafa498c391a708f115b3d01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}