{
  "manageEntity": {
    "action": "Save",
    "entityId": "438961",
    "entityType": "Track",
    "nonce": "0xce7be59cbcced357c641f6c72f316d82c9060af52840e23df4a10bd5306a16c2",
    "signature": "0x75389b4890c88b7237638661e97b5bd5a2320fbd253cb320f445be1a8219e32158e5a0572d45e8f70342cef39169d0613492ff0774760a63ec867f74d1d26e9e1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}