{
  "manageEntity": {
    "action": "Save",
    "entityId": "315068",
    "entityType": "Track",
    "nonce": "0xe7bf78805e9609faafdd0c3da6da36a90fa7c8ee6d0e3c9a7e69a5fe9ba74302",
    "signature": "0xc5f2291d8bfa4129db9480705dd1d0d1c28a9c2147ca3541fd5a51a40582444f74e2b3a01dfb64aead47981a0fb92ea5a62f9f54dc1b60af75343f5a8c75370c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}