Failure Modes

How systems that can't afford to be wrong actually break.

Distributed-systems and payments correctness, demonstrated: trigger the failure yourself, and watch the fix survive it.

Money & correctness

The signature category — almost nobody can demo this credibly.

money kept in floats — rounding drift creates or destroys cents over many operations

a retried payment request races the original — without a key, both go through

Where the series started. The producer/consumer guarantees the rest builds on.

commit a payment, publish the event as a second write — a broker hiccup loses it forever

the same event delivered twice — a naive handler double-counts it in the ledger