Bitcoin Optech #226

This week’s newsletter describes a proposal to enable generalized smart contracts on Bitcoin and summarizes a paper about addressing LN channel jamming attacks.

This week’s newsletter describes a proposal to enable generalized smart contracts on Bitcoin and summarizes a paper about addressing LN channel jamming attacks. Also included are our regular sections with descriptions of changes to services and client software, announcements of new releases and release candidates, and summaries of notable changes to popular Bitcoin infrastructure software.

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COLDCARD Disaster: Weak Entropy Bug Enables Drain of Funds from Seeds Generated Since 2021

A build error present in COLDCARD firmware for more than five years made seeds generated on affected devices predictable, enabling attackers with no access to the hardware to reconstruct private keys offline and sweep the matching addresses.

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Ashigaru Whirlpool and Terminal v1.0.0 Released

Ashigaru Whirlpool is a ZeroLink coinjoin implementation designed to sever all deterministic links between inputs and outputs, ensuring enhanced bitcoin transaction privacy.

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