{
  "manageEntity": {
    "action": "Save",
    "entityId": "845617502",
    "entityType": "Track",
    "nonce": "0xf690252d9b43acf5ec183e2ecaf2fed125976c9840a7875e6aafc20f098102f0",
    "signature": "0x2bb1b6643ef461244053935663d8e38f9296f7bfdf7544dd1c2636d32f4a323e3c396e8c50dbb1f0f99df77fce040ca6d4d4ed3dc121c944f82631be4ba969261b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}