Hashed server seed
The SHA-256 fingerprint of the casino's secret seed, shown to you before you bet so the casino can't swap the seed later.
Think of the hashed server seed as the casino's sealed envelope. The site makes a secret server seed, runs it through SHA-256, and shows you only that fingerprint before a single bet uses it.
Why the trick works
SHA-256 goes one way only. You can't rebuild the seed from the fingerprint, so you can't see your next results coming. And nobody can realistically cook up a second seed with that exact same fingerprint, so the casino is stuck with the one it picked.
Save a copy
When you start playing, grab the hash and keep it off the casino's site: screenshot it, paste it in your Notes app, text it to yourself. If your bet history later shows a different hash, that's a huge red flag.
Checking it after
You saved the hash before your session. You rotate seeds, and the casino reveals the actual seed. Drop it into our verifier or any SHA-256 tool. What comes out has to match your screenshot exactly, every single character. If it doesn't, don't trust any result that came from that seed.