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Seth For Privacy explains that Spark and Breeze SDKs enabled a self-custodial Lightning payment UX that was seamless enough to integrate into Signal, overcoming previous technical hurdles.
Seth For Privacy acknowledges Spark currently lacks seamless unilateral exit, a trade-off made for UX, but notes Breeze is working on a fix and users can exit with separate tooling.
Spark's design allows Polymarket to avoid managing confirmation thresholds or running its own Lightning nodes, crediting deposits instantly. Spark's SDK also handles on-chain and stablecoin rails, and wallets like Breeze, Xverse, and Cake build on it.
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