Bitcoin Optech #233

This week’s newsletter describes an idea for allowing offline LN nodes to receive funds onchain that they’ll later be able to use offchain without extra delay.

This week’s newsletter describes an idea for allowing offline LN nodes to receive funds onchain that they’ll later be able to use offchain without extra delay. Also included are regular sections with summaries of new software releases and release candidates, plus descriptions 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.

03 Aug 2026

7 min read

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.

23 Jun 2025

3 min read