“Not Your Keys, Not Your Coins” Is Not Enough

This slogan (perhaps coined by Bitcoin evangelist Andreas Antonopoulos) has been popular among the Bitcoin community for some time. “Keys” here refer to the private keys, implying that those who are in possession of the private keys own the bitcoins controlled by those keys. While this slogan was true in the early days of Bitcoin, …

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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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