{
  "manageEntity": {
    "action": "Save",
    "entityId": "576573",
    "entityType": "Track",
    "nonce": "0x9d8b53f59c1c4537cbe4adb23cbe08865727e93b17c43eff00e2a9cf841e9223",
    "signature": "0xea24a9cf7c63e73dc5bbe25663da7aeff456cd0a1d233060d5b1474341911d9a7df2b9c6a63d8c4af23fcd80421c7e177589d326933886038b58e0d3037be0c91c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}