{
  "manageEntity": {
    "action": "Save",
    "entityId": "1400650647",
    "entityType": "Track",
    "nonce": "0xfe882e6bbf44e91cd75bcda0faa9a6e63812cdff431c121f2dce346db84e8966",
    "signature": "0xd48db0a4c2cadda8500657e49178a1f36acf6f305f20c06ac42dc107f8f4f31347c88c3ab72395a8faf7386086053ad12d6fee73d56592bbe292b50383399e6c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}