{
  "manageEntity": {
    "action": "Save",
    "entityId": "646051908",
    "entityType": "Track",
    "nonce": "0xac1d362314681d4506dbd99e046d2df3c02c00be48566f9775a34f8daaf965d0",
    "signature": "0x73de7bea05f7b44e9f428cc2e88844c7cba93a561c4640366e33810ced0d363f17e0ff4329d7cd6e74b9db6dfedb15ea8a6ad4e7a39c5498138c7ccec024b7111b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}