{
  "manageEntity": {
    "action": "Save",
    "entityId": "139555626",
    "entityType": "Track",
    "nonce": "0x3249735dbaa9745ecc6d56a72e1ebe9e20a00dfbf4d99fb7c3261d313855e5cf",
    "signature": "0xd4f996e9a4678cc01998ae2377fd85248ce1e07c9d03201ec740f27657dfd5d15e35674c32420c441ae4c9460fbd42e0184a9e6997d574236af6d596447e0d2a1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}