帮老人代购美电商补剂账号遭封，咨询商家用户识别方式（MAC地址等）

Hey there, let's walk through the most likely ways that big online retailer is flagging your newly created accounts—MAC address is almost certainly not the culprit here. Here are the key methods they’re using:

• Payment Method Linkage: This is the biggest red flag. You’re using the same PayPal account to pay for every order, even across different user accounts. Retailers have robust systems to map payment methods to multiple accounts, and seeing one PayPal tied to dozens of new, low-activity accounts is an immediate trigger for fraud detection.
• IP Address Tracking: If you’re creating all these accounts from the same home or office IP address, the store’s systems will note that multiple new accounts are originating from the same location. Even if you reset your router, most residential ISPs assign dynamic IPs that stay in the same general range, so the store can still spot the pattern.
• Browser Fingerprinting: This is super common for fraud prevention. Your browser leaves a unique "fingerprint" based on details like:
  • Browser version and update status
  • Installed extensions/plugins
  • Screen resolution and color depth
  • Enabled fonts
  • JavaScript settings
    Even if you clear cookies, this fingerprint stays consistent across sessions and accounts, letting the store tie everything back to you.
• Behavioral Pattern Recognition: Machine learning models look for consistent patterns in how you create accounts. For example:
  • Filling out forms at the same speed every time
  • Using similar password structures (even if they’re different)
  • Skipping the same optional fields every time
  • Accessing the site at the same times of day
    These small, consistent behaviors get flagged as automated or high-risk activity.
• Cookie/Storage Persistence: Even if you delete regular cookies, some sites use alternative storage methods like localStorage, sessionStorage, or even browser-specific identifiers (like Chrome’s "client ID") that stick around between sessions. These can be used to track you across account resets.

As for MAC addresses? They rarely make it past your home router—when you connect to the internet, your router replaces your device’s MAC with its own, so the retailer never sees your actual device MAC address. That’s not the issue here.

If you want to avoid getting blocked, you’d need to break these links: use different payment methods (if possible), switch up your IP address with a reputable US-based proxy/VPN, use a fresh browser profile (or incognito mode with extensions disabled) for each account, and vary your account creation behavior (slow down, fill out different optional fields, use different password patterns).

内容的提问来源于stack exchange，提问作者J.Males