{
  "manageEntity": {
    "action": "Save",
    "entityId": "984620",
    "entityType": "Track",
    "nonce": "0xd980e7ca9854fac0ea9e97bc261f7e5c96272405e9abf59f47dfc3624477d6a4",
    "signature": "0x9e22fe9a16276cca812480fe81c3bfed6aab83aa989825a3a5b4ef6ef1d3aaa4483083de9e4d35122dad1969315937b7fd109881c93f9f9c4aade2690b1c1dc91b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}