Bitcoin Optech #236

This week’s newsletter summarizes a proposal for serverless payjoin and describes an idea for allowing proof of payment for LN async payments.

This week’s newsletter summarizes a proposal for serverless payjoin and describes an idea for allowing proof of payment for LN async payments. Also included is our regular section with 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

LND v0.19.0-beta: RBF Cooperative Close, Improved Payment Reliability & More

The Lightning Network Daemon (LND) is a complete implementation of a Lightning Network node developed by Lightning Labs.

03 Jun 2025

6 min read

Bitcoin Optech #236

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

Ashigaru Whirlpool and Terminal v1.0.0 Released

LND v0.19.0-beta: RBF Cooperative Close, Improved Payment Reliability & More

Join 50 000+ fellow Bitcoiners!

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You might also like

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

Ashigaru Whirlpool and Terminal v1.0.0 Released

LND v0.19.0-beta: RBF Cooperative Close, Improved Payment Reliability & More

Join 50 000+ fellow Bitcoiners!