segregated witness – Bitcoin transaction malleability is it only for unconfirmed transaction?

TL;DR: Yes, once a transaction is confirmed, unless a chain reorganization makes it unconfirmed again, no forms of malleability are possible. SegWit specifically fixed TXID malleability of unconfirmed transactions, but other forms of malleability are possible. Transaction malleability in general refers to the possibility of a third party changing some parts of a transaction without […]

The Download: Trump’s potential climate impact, and the end of cheap helium

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. Trump wants to unravel Biden’s landmark climate law. Here is what’s most at risk. President Joe Biden’s crowning legislative achievement was enacting the Inflation Reduction Act, easily the nation’s largest investment into addressing […]

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