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stablecoins have showcased one of crypto's most valuable use cases: instant, global payments available 24/7 with no intermediaries, delays, or weekend closures.
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A reentrancy attack happens because the EVM doesn't allow concurrency. This means that two contracts involved in a message call cannot run simultaneously. An external call pauses the calling contract's execution and memory until the call returns, then execution proceeds normally
The last mile in crypto still a problem to solve, using crypto to pay small businesses for services without using traditional financial rails.