Device Fingerprinting and Behavioural Biometrics: How Online Casinos Detect Multi-Accounting and Bonus Fraud
Online casinos need to detect cases where one person tries to appear as several customers. Duplicate accounts can repeat registration offers, hide linked activity or bypass restrictions. In 2026, operators combine identity checks with device and behavioural signals.
How Device Fingerprinting Links Accounts
Device fingerprinting builds a profile from signals sent by a phone or computer, including browser, operating system, screen settings, language, time zone and network data. It does not prove identity, but it can show when different accounts repeatedly use the same device.
Device checks are particularly relevant when one account gives access to different types of casino content and promotions. This is common across modern online casinos, where players may move between slots, live games and table games. NolimitWay is one example of an online casino with a broad choice of games across several categories.
An IP address alone is weak evidence because households, offices and mobile networks may share one connection. Fraud teams therefore combine signals: the same device, matching payment details, similar registration data and repeated bonus claims.
Why Behavioural Biometrics Adds Another Layer
Behavioural biometrics studies how a person interacts with a site or app. Typing rhythm, mouse movement, swipe patterns, navigation speed and form completion can reveal repeated account creation or automated activity.
A user may change email, clear cookies or switch networks while keeping similar interaction habits. Behavioural analysis adds another signal without requiring a fingerprint or face scan.
These signals are used for risk assessment rather than as an automatic verdict. A suspicious account may face extra identity checks, manual review or a temporary bonus restriction.
How Multi-Accounting and Bonus Abuse Are Identified
Bonus abuse often appears as a pattern: linked accounts register quickly, claim the same offer, use similar deposits or payment methods and request withdrawals in a similar sequence. Device data can expose links that names and emails do not.
KYC remains important. In Great Britain, remote licensees must have procedures designed to identify separate accounts held by the same individual. Identity, payment and account-linking checks therefore work alongside device analysis.
More organised abuse can involve synthetic identities or people allowing their details to be used for new accounts. The UK Gambling Commission has warned about schemes that pay consumers for personal data used to open multiple gambling accounts.
Accuracy, Privacy and Fair Treatment
No single signal is reliable in every case. Family members can share a device, travellers change locations and privacy tools alter network data. Strong controls combine evidence and send uncertain cases for review.
Device and behavioural monitoring also creates privacy duties. Operators handling UK or European customers need lawful processing, clear notices and safeguards for stored information.
Repeated promotion claims through accounts are harder to conceal. Operators must stop abuse without treating every shared device as fraud. In 2026, layered checks remain the balanced approach.