A bitcoin casino works like any online casino at the tables, but its cashier is a crypto wallet address. A deposit is a transfer recorded on the blockchain, confirmed by the network before the balance appears, and a withdrawal is the same transfer in reverse. The term blockchain casino usually means the same thing, although a few sites also run games whose results are recorded or verified on chain. Either way, the casino still holds the balance while the player plays.
Crypto casino withdrawal times are the main draw. Once the casino approves a request, a bitcoin casino withdrawal arrives as soon as the network confirms it, often within an hour, and faster coins settle in minutes. Instant withdrawal claims usually describe that network speed rather than the approval step, which can still wait for identity checks or a review of bonus terms. Fees depend on the coin and on how busy its network is at the moment of sending.
Some questions are not about payments at all. Most scholars of Islamic law treat gambling as forbidden whatever the currency, so paying in crypto does not make a casino halal. Legality depends on where the player lives, and many crypto casinos hold a licence from a single offshore regulator or none, which leaves little recourse in a dispute. Checking the licence, the terms for withdrawals and the coins accepted before depositing avoids most of the problems players report.