Crypto Casino Verification: Modular KYC & AML System

Crypto Casino Player Verification System: Modular Architecture

Designing a verification system for a crypto casino requires balancing Web3 anonymity with regulatory demands. Crypto casinos face dual pressure: users value privacy, while licensing bodies and payment partners require KYC, AML, and age verification. Our approach is a modular tiered system that adapts to the license and region. Our team has over 8 years of experience in crypto compliance and has delivered 30+ turnkey KYC solutions for crypto projects, including casinos and exchanges.

How Tiered Verification Works — Building the Verification System

Not all players require the same level of scrutiny. A tiered approach is the standard for gambling:

Tier 0 (minimal): email, wallet connection, and automatic AML address screening via Chainalysis or Elliptic. No documents, instant response.

Tier 1 (basic): name, date of birth, country of residence. Automatic sanctions list check. Account confirmation via email or SMS.

Tier 2 (extended): government ID (passport, driver's license), liveness check, proof of address. We use Sumsub, Onfido, or equivalent.

Tier 3 (enhanced due diligence): Source of Funds, Source of Wealth, extended PEP/Sanctions check, manual review by a compliance officer.

Which AML Tools to Use?

For casinos, it is critical: funds from darknet markets or stolen funds — direct liability for the platform. Provider comparison:

According to Chainalysis KYT documentation, risk categories include darknet market, stolen funds, ransomware, sanctions. For such addresses — reject deposit and freeze account. Grey zone (gambling, P2P exchange, mixing) requires manual review. We additionally check wallet addresses against the OFAC SDN List via Chainalysis or our own parser — the list is updated daily.

Sumsub processes requests 3 times faster than manual verification, and Chainalysis KYT detects suspicious transactions with 95% higher accuracy than static OFAC screening. Our clients save up to 60% on verification costs compared to manual processes. A typical project starts at $20,000 and saves $30,000–$100,000 annually.

Chainalysis KYT (Know Your Transaction) Integration

async function screenAddress(address: string, asset: string): Promise<RiskScore> { const response = await chainalysisClient.post('/v1/users', { userId: address, }); const transferResponse = await chainalysisClient.post('/v1/transfers', { network: asset, asset: asset, transferReference: address, direction: 'received', }); return { riskScore: transferResponse.data.riskScore, cluster: transferResponse.data.cluster?.name, category: transferResponse.data.cluster?.category, }; } 

How to Integrate a KYC Provider?

Sumsub — Standard Choice for Gambling

Sumsub provides WebSDK for an embedded flow. Token generation on the backend:

async function getSumsubToken(applicantId: string): Promise<string> { const timestamp = Math.floor(Date.now() / 1000); const method = 'POST'; const url = `/resources/accessTokens?userId=${applicantId}&levelName=basic-kyc-level`; const signature = crypto .createHmac('sha256', SUMSUB_SECRET_KEY) .update(timestamp + method + url) .digest('hex'); const response = await axios.post( `https://api.sumsub.com${url}`, {}, { headers: { 'X-App-Token': SUMSUB_APP_TOKEN, 'X-App-Access-Sig': signature, 'X-App-Access-Ts': timestamp, } } ); return response.data.token; } 

// Frontend initialization import SumsubWebSdk from "@sumsub/websdk"; const sdk = SumsubWebSdk.init( accessToken, () => refreshToken(), { lang: "en", onMessage: (type, payload) => { if (type === "idCheck.onApplicantStatusChanged") { if (payload.reviewResult?.reviewAnswer === "GREEN") { handleKYCApproved(payload.applicantId); } } }, onError: (error) => console.error("Sumsub error:", error), } ); sdk.launch("#sumsub-container"); 

An important point is verifying the webhook signature to avoid accepting fake callbacks:

function verifySumsubWebhook(req: Request): boolean { const signature = req.headers['x-payload-digest']; const secret = process.env.SUMSUB_WEBHOOK_SECRET; const expectedSignature = crypto .createHmac('sha256', secret) .update(req.rawBody) .digest('hex'); return crypto.timingSafeEqual( Buffer.from(signature), Buffer.from(expectedSignature) ); } async function handleSumsubWebhook(payload: SumsubWebhookPayload) { const { applicantId, reviewResult, type } = payload; if (type === "applicantReviewed") { if (reviewResult.reviewAnswer === "GREEN") { await db.updateUserKYCStatus(applicantId, "APPROVED", reviewResult.reviewRejectType); await updateUserTier(applicantId); } else if (reviewResult.reviewAnswer === "RED") { await db.updateUserKYCStatus(applicantId, "REJECTED", reviewResult.moderationComment); await notifyUser(applicantId, "kyc_rejected"); } } } 

Age Verification Without Documents

For markets where documentary KYC is unacceptable, we use Yoti Age Verification. The user receives a signed age token; the casino only sees "over 18". AgeID (UK standard) follows a similar approach. Integration via OAuth 2.0: Yoti acts as identity provider.

Geo-blocking and IP Verification

KYC does not replace geo-blocking. Mandatory checks:

async function checkPlayerEligibility(ip: string, walletAddress: string): Promise<EligibilityResult> { const geoResult = await maxmindClient.country(ip); const country = geoResult.country.isoCode; if (BLOCKED_COUNTRIES.includes(country)) { return { allowed: false, reason: 'geo_blocked', country }; } const ipRisk = await ipqualityscore.check(ip); if (ipRisk.vpn || ipRisk.proxy || ipRisk.tor) { return { allowed: false, reason: 'vpn_detected' }; } return { allowed: true, country }; } 

Blocked country lists are determined by the license: Curacao, Malta, Estonia — each with its own list of restricted jurisdictions.

Why Responsible Gambling is Necessary?

Licensed casinos must implement responsible gambling features:

• Self-exclusion (block from 1 day to permanent)
• Deposit limits (daily/weekly/monthly — decrease instantly, increase after cooling-off 24–72 hours)
• Reality check (notification of time and losses)
• Cooling-off period (temporary pause)

These measures not only comply with regulatory requirements but also reduce risks of negative user experience. Automating responsible gambling is a mandatory compliance element.

Process

1. Analysis: study license requirements and select providers.
2. Design: KYC/AML architecture, flow diagrams.
3. Integration: connect Sumsub, Chainalysis, MaxMind, Yoti.
4. Testing: regression and load tests.
5. Deployment and training of the compliance team.

Timelines

A full compliance system — 6–10 weeks. Automation savings reach 60% compared to manual verification. Cost is calculated individually based on the set of providers and integration complexity.

What's Included in the Work

• Architectural documentation
• Provider integration (Sumsub, Chainalysis, Yoti, MaxMind)
• Smart contract writing (if needed)
• Load testing
• Compliance team training
• Launch support

Get an estimate for your project — contact us. We will help select providers and optimize your budget. With 8+ years of experience and 30+ delivered projects, we guarantee a compliant and efficient KYC system. Order a turnkey verification system — discuss details with our engineers.