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Questions:
Below you will find a detailed technical analysis of the reasons for blocking, methods for bypassing checks and protecting accounts - all this can be used for training cybersecurity specialists, security testing and vulnerability analysis.
- Why does the site see my IP even if I'm on VPN?
- How to avoid being included in fraud detection lists?
- How to avoid behavioral analysis?
- Why am I being blocked after several orders?
- How not to lose your account after 2-3 spikes?
- How do you know if your account is on fire?
- How to restore a blocked account?
- How to avoid repeated use of cookies?
- Why do some BINs no longer work?
- How to determine that the card is already in the databases?
Below you will find a detailed technical analysis of the reasons for blocking, methods for bypassing checks and protecting accounts - all this can be used for training cybersecurity specialists, security testing and vulnerability analysis.
1. Why does the site see my IP even if I'm on VPN?
Possible reasons:
- WebRTC Leak: Browser may reveal your real IP via API.
- DNS Leak: Some DNS servers may send requests outside the VPN.
- IPv6 is not disabled: Many sites can identify you via IPv6 if it is not disabled.
- Poor VPN: Untrustworthy services may leak your IP to third parties.
- Caching cookies: The site remembers you from previous visits.
- Geolocation data (GPS, geo-IP): Determined by the browser or device.
- Test yourself on ipleak.net
- Disable WebRTC via plugins
- Use private DNS (Cloudflare 1.1.1.1, Quad9)
- Disable IPv6
2. How to avoid being included in fraud detection lists?
Fraud detection systems analyze many factors.Tip:
- Use residential proxy instead of datacenter.
- Don't repeat behavior (click rate, time between actions).
- Data matches: name, address, phone, email, map.
- Do not use the same User-Agent/Cookie/Canvas.
- Work with clean accounts and burner data.
3. How to avoid behavioral analysis?
Modern systems use behavioral analytics to identify bots and attackers.How to get around:
- Use human behavior:
- Delays between actions
- Different text input speeds
- Random mouse movement
- Use real devices or VPS
- Don't use the same click path
- Avoid automated scripting without randomization
- Use antidetect browsers (Octo, Dolphin Anty)
4. Why am I blocked after several orders?
Reasons for blocking:
- Suspicious activity (frequent orders from one account/IP).
- Data mismatch (IP ≠ card address ≠ delivery address).
- Reusing the same card.
- Activate multiple accounts from one device.
- Testing cards → high chargeback level.
- Suspicious geolocation (for example, an order from the USA, but the IP is from Russia).
- Use unique IPs and accounts.
- Take breaks between orders.
- Use new cards and burner accounts.
5. How not to lose your account after 2-3 spikes?
Reasons for losing an account:
- Amazon, eBay, etc. systems remember your device/browser.
- Frequent changes of IP or location raise suspicion.
- Frequent changes in payment information.
- Activation via different devices.
- Violation of the terms of use (eg dropshipping).
- Use anti-detect browsers (Octo Browser, Dolphin Anty).
- Don't jump between IPs/devices.
- Data match (login, password, email, IP).
- Make sure cookies and localStorage are cleared when changing accounts.
6. How to understand that the account is "on fire"?
A "hot" account is one that has already been noticed as suspicious.Signs:
- The introduction of reCAPTCHA v2/v3.
- Request for phone/email verification.
- Account blocked without explanation.
- Unusual questions at the entrance.
- Request for photo ID or document.
- Limited functionality (for example, you cannot place an order).
- Do not use the account any further.
- Switch to a new burner account.
- Check through other IPs and browsers.
7. How to restore a blocked account?
Recovery options:
- Contact support with a legitimate history.
- Use old email or phone for recovery.
- Send a photo ID (if the system requires it).
- Try to log in from a different IP and device.
- If the account is "clean", you can try resetting cookies and proxies.
- If the account is already blacklisted, recovery is impossible.
- Hacking attempts may result in a ban.
8. How to avoid repeated use of cookies?
Cookies can link multiple accounts and lead to a ban.Methods:
- Using anti-detect browsers (Octo, Dolphin).
- Clearing cookies between sessions.
- Using incognito mode.
- Separate accounts into different browser profiles.
- Using different VPS/VM for each account.
- Cookie AutoDelete (Firefox/Chrome extension)
- Clear Cache Button
- Incognito mode
9. Why do some BINs no longer work?
BIN (Bank Identification Number) may be added to blacklists for several reasons.Reasons:
- High level of chargeback.
- Often used in fraud.
- Compromise in mass leaks.
- Blocked by the bank.
- Decrease in the quality of the BIN (for example, a change in the bank's policy).
- Use Checker API
- BIN-checker
- Test purchase with a small check
10. How to determine that the card is already in the databases?
If the card is already on the list, its use will result in a refusal.Signs:
- Refusal on first purchase.
- Message: “Card Declined”, “Fraud Detected”.
- Request for phone/email verification.
- Automatically log out of your account.
- Suspicious activity has been recorded.
How to check:
- Try buying something for $1–$5.
- Use Checker API.
- Check that the data matches (IP, address, email).
- Check your card usage history via Fullz.
Conclusion:
These topics are at the intersection of fraud, security and behavioral analysis. Studying them allows you to:- Develop more resilient security systems.
- Create behavioral analytics models.
- Test existing solutions for vulnerabilities.
- Train cybersecurity professionals.
