A decentralised roulette dApp is a smart contract and a web page that talks to it, with no account, no ledger and no operator holding your coins between spins. A crypto games roulette site, or any casino site that takes crypto, is a company running a database, where deposits become a balance, spins update that balance, and withdrawals send coins back. The wheel has the same 37 pockets on both. The difference is everything around the wheel, and it shows most clearly by following one ten-dollar bet on red through each.
Ten dollars on red at a dApp
You open the page and connect a wallet. There is nothing to deposit, because there is no balance. You choose red, enter ten dollars in the coin, the contract accepts, and approves a transaction. The wallet pays gas, a pound or more on the main chain and a cent or two on a layer 2, and the ten dollars moves from your wallet into the contract for the length of the spin. A randomness request goes out, and a minute or two later on the main chain, or a few seconds on a layer 2, the number comes back with a proof. Red wins, and twenty dollars moves from the contract to your wallet in the settlement transaction. Red loses, and the ten dollars stays in the contract’s bankroll. Either way, the coins are back under your keys, or gone, before you place the next bet.
If something goes wrong, the contract’s rules are the whole remedy. A stalled draw expires, and the stake is claimable. A reverted bet returns the stake. A failed payout is owed and claimable. There is no support desk and no one to write to, and there is no verification, no deposit cap and no withdrawal review, because none of those things exists without an account.
Ten dollars on red at a casino site
You log in and check the balance, which you funded earlier with a deposit that took a network fee and a confirmation wait. You choose red, place ten dollars from the balance, and the spin settles in under a second with no transaction and no fee, because the bet and the payout are lines on the site’s ledger. Red wins, and the balance shows twenty dollars more. Red loses, and it shows ten less. The coins behind the balance stay in the site’s wallet until you request a withdrawal, which passes through the site’s caps and, above a threshold, a manual review.
The draw is a provably fair seed pair on the site’s own tables or a lab-certified RNG on provider tables, and checking it uses the seeds the site reveals rather than data on a chain. If something goes wrong, a stuck deposit or a disputed round goes to support, which can be credited by hand. The remedy is a person, and it depends on the site’s policy and its licence.
Which suits which player?
- Many fast spins at small stakes – The casino site, because free spins on a ledger beat a fee per bet.
- Never letting anyone hold the bankroll – The dApp, because the coins are in your wallet between spins.
- Wanting someone to call when a deposit goes wrong – The casino site.
- Wanting every input to the draw on a public chain – The dApp.
Most players who try both end up using each for what it does well, and the ten dollars on red pays the same at either.
