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The failure modes we design against — missed deposits, double withdrawals, drifting balances, duplicate callbacks — and how to build systems that avoid them.
Showing 5 articles.
The transfer is confirmed on-chain, but the player's balance never moves. The usual causes — scanner gaps, reorgs, token edge cases — and how to design them out.
Two withdrawal requests arrive a few milliseconds apart and both pass the balance check. Why check-then-act fails, and how locks, idempotency and state machines prevent it.
Floats, rounding and rates applied at the wrong moment make multi-currency casino balances drift. How to store money, record conversions and reconcile per currency.
Game providers retry callbacks, reorder them and send rollbacks for bets you never saw. How to build a seamless wallet that applies every transaction exactly once.
Server seeds, client seeds, nonces and HMAC-SHA256, explained step by step. What provably fair guarantees, what it doesn't, and how to check a result independently.
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