{
  "manageEntity": {
    "action": "Save",
    "entityId": "674630798",
    "entityType": "Track",
    "nonce": "0x2f7fe4e61f189388323b6b909fe94b43632017b326be2b9bc21772b55f625764",
    "signature": "0xb5d31e1ae9f75f3f49c1db5f0996312c7ded64c717262a31cc14df3959af88d16f4144949cc7bb04f166928cfb89aafcf87dcfac5423e94e61ecea938c7ba62d1c",
    "signer": "0x1B3b4B0dA47907b8b3E72068bA7DeC3B192f26d7",
    "userId": "953699848"
  }
}