{
  "manageEntity": {
    "action": "Save",
    "entityId": "21740",
    "entityType": "Track",
    "nonce": "0x00c46e2f25e6e36a7a49b9667212133347829aeaa9eaa0867a5040d2f27b218b",
    "signature": "0xc81e71881273cb46e983f6a1722d97399aab70c39ada457ffd766b9d6a3e56c238557b071d26be4cbda36da779dea32c2c51e102e601da7f32e34477ff31ef1b1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}