{
  "manageEntity": {
    "action": "Save",
    "entityId": "21247202",
    "entityType": "Track",
    "nonce": "0x64b43bf55865da43233f4ef3f3da3166f172e0d36158f6b5adbc2316fd219a92",
    "signature": "0xb8be40fc073a18f5ece581c56e0d66d19798a1c0162915d177c28f31557842e3403b2019d1b52195f8139ec07dbf74c82b21678a994b53a8aa0c398f68b5c2cc1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}