How online casinos work
A licensed UK casino is more than a website with colourful thumbnails. Reel Registryexplains the machinery behind the lobby so you know what you are comparing when you read our operator reviews.
Random number generators
Digital slots and RNG table games rely on software that generates unpredictable results each round. The algorithms are seeded and tested so neither the player nor the operator can predict the next outcome. Licensed UK casinos must use RNG modules certified by independent testing houses such as eCOGRA, GLI or iTech Labs.
Fairness testing
Testing labs run millions of simulated spins to confirm the observed return matches the published theoretical RTP within statistical tolerance. Reports are referenced in game help files. Live dealer games use physical cards and wheels streamed from studios — fairness there depends on standard casino procedure plus camera oversight, not RNG code.
UKGC licensing
The UK Gambling Commission licenses operators serving customers in Great Britain. Licence holders must segregate player funds, verify identity, offer safer-gambling tools, display terms clearly and submit to ongoing compliance checks. You can confirm a brand's licence number on the Commission's public register.
What happens when you place a bet
Your stake leaves your cash balance (or bonus balance if applicable) and the game client sends a bet request to the operator's server. The server calls the RNG or relays your decision to a live table, records the result and updates your balance. Session logs are stored for dispute resolution and regulatory audit.
Game providers vs operators
Operators like BetVictor or Sky Vegas run the website, hold your account and hold the licence. Studios such as NetEnt, Pragmatic Play or Evolution build the games and supply them through integration platforms. The operator chooses which studios to host; the studio maintains the maths model and RTP settings within approved ranges.
Ready to compare specific brands? Return to our ranked showcase or read the glossary for individual terms.
