The Missing Multisig Standard

Today Shift Crypto and Nunchuk jointly disclosed a vulnerability affecting multisig wallet setups that use Coldcard. However, this vulnerability has implications for all current wallet vendors and multisig solution providers. For details, please check out Shift Crypto’s blog. The quick summary is that prior to Coldcard firmware version 3.2.1 (released on Jan 8th, 2021), you can fool a Coldcard into accepting …

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