{
  "manageEntity": {
    "action": "Save",
    "entityId": "219731478",
    "entityType": "Track",
    "nonce": "0xd914f70fe7f357166b59c33bb61d32fb1962276c0926fd60f0ee7b9420e13e01",
    "signature": "0xc68fd1e6e45e14ba22db000634f19840ef4322b3afacc38787fc207f114d5f042f9d766af2d86dfb601f8df5db415460671c6e9997b756c67fef5cc763bac6931b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}