Bitcoin Optech newsletter #425 is here:

• summarizes the responsible disclosure of two denial-of-service vulnerabilities affecting older versions of Eclair
• describes a proposal for synchronizing wallet labels between devices through an untrusted store
• recaps continued discussion of PQC output types
• describes an approach to block-wide signature aggregation via SNARKs
• summarizes bounds on chain length with BIP54 time warp fixes
• links to research comparing covenant proposals for vaults
• discusses the depots idea for probabilistic Lightning channels
• Optech Newsletter #425 Podcast
  https://bitcoinops.org/en/newsletters/2026/10/02/

Matt Morehouse posted to Delving Bitcoin the responsible disclosure of two denial-of-service (DoS) vulnerabilities affecting Eclair v0.13.1 and earlier...
https://bitcoinops.org/en/newsletters/2026/10/02/#disclosure-of-two-dos-vulnerabilities-in-eclair

Jakub posted to the Bitcoin-Dev mailing list to gauge interest in standardizing synchronization of wallet labels between wallets through a shared, untrusted store before writing a specification...
https://bitcoinops.org/en/newsletters/2026/10/02/#proposal-for-wallet-label-synchronization

Discussion continued following last month’s summary of Pieter Wuille’s Delving Bitcoin thread on post-quantum output types...
https://bitcoinops.org/en/newsletters/2026/10/02/#continued-discussion-of-pqc-output-types

Conduition posted to Delving Bitcoin a design sketch for compressing many post-quantum signatures in a block into a single SNARK...
https://bitcoinops.org/en/newsletters/2026/10/02/#block-wide-signature-aggregation-via-snarks

Pieter Wuille posted to Delving Bitcoin a proof that the two timestamp rules in the consensus cleanup proposal (BIP54) suffice to bound how many blocks can be mined in a chain of given work...
https://bitcoinops.org/en/newsletters/2026/10/02/#bounds-on-chain-length-with-bip54-time-warp-fixes

Lillian Wang posted to Delving Bitcoin and cross-posted to the Bitcoin-Dev mailing list a report comparing simplified vault constructions...
https://bitcoinops.org/en/newsletters/2026/10/02/#comparing-covenant-proposals-for-vaults

John Law posted to Delving Bitcoin a protocol in which an operator funds a single time-limited taproot output (a depot) that can host Lightning channels for many thousands or millions of users...
https://bitcoinops.org/en/newsletters/2026/10/02/#depots-for-probabilistic-lightning-channels

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.