{
  "manageEntity": {
    "action": "Save",
    "entityId": "310449",
    "entityType": "Track",
    "nonce": "0x4ebe2a04c77bf0760e7b09d604893b6a550b0b5910101e36db5b74ec6c7e8dae",
    "signature": "0x6c407fa2dac7936b56003e0dd7f335aa8c8c3ac42c2a5f53bcd79d8ec4e128c302ca284256e474e7c292ff84e176b4c1767fb1872cbaa16a67144a3496f82b651b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}