{
  "manageEntity": {
    "action": "Save",
    "entityId": "1435885798",
    "entityType": "Track",
    "nonce": "0x9ef1b4cda0c8aed856dc6fadbd8ec1ae2fa26d085304e649a1cacff32f518fa1",
    "signature": "0x377ebda0ecf4a32e1b98621f1da1a0fdd1378a093f99e347cde11bc1f6e0628e1d8f9810e24f5ba33f98e04bf5aafa9140cb313577d0cdcf4554693be5d6ebc91b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}