Kırılmaz, Asimetrik İmzalı Yazılım & Eklenti Lisans Altyapısı

// SynapseLicenseValidator.cs (.NET 8 / CounterStrikeSharp)
using System.Net.Http.Json;

public class SynapseSecurityClient
{
    private const string ApiEndpoint = "https://synapsecode.com.tr/api/v1/licenses/verify";
    private readonly HttpClient _client = new();

    public async Task<bool> VerifyLicenseAsync(string licenseKey, string hwid)
    {
        var payload = new
        {
            licenseKey,
            productSlug = "cs2-tournament-engine",
            hwid,
            nonce = Guid.NewGuid().ToString("N"),
            timestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds()
        };

        var response = await _client.PostAsJsonAsync(ApiEndpoint, payload);
        if (!response.IsSuccessStatusCode) return false;

        var result = await response.Content.ReadFromJsonAsync<LicenseVerifyResponse>();
        // Verify Ed25519 asymmetric signature with public key
        return result?.Success == true && result.Data?.Valid == true;
    }
}