Csaba Purszki posted to Delving Bitcoin his research on finding a better alternative to Golomb-Rice Coded Sets (GCS) used for compact block filters as defined in BIP158...

In a post on the Bitcoin-Dev mailing list, Conduition described a design for post-quantum BIP32 congruent hierarchical deterministic wallets with fallback SPHINCS keys...

Antoine Poinsot wrote to the Bitcoin-Dev mailing list defending a plain post-quantum output type (as opposed to a P2TR-like output type which allows quantum-vulnerable key spending to be disabled by a later soft fork)...

Daniel Buchner sent a proposal to the Bitcoin-Dev mailing list which describes a potential path to enabling flexible post-quantum wallet designs without fully describing the signature validation parameters...

On Delving Bitcoin, Antoine Poinsot wrote about a demonstration of the types of slow-to-validate blocks that BIP54 (consensus cleanup) prevents...

Olaoluwa Osuntokun (roasbeef) posted on the Bitcoin-Dev mailing list his project to demonstrate zk-STARK recovery of quantum-vulnerable coins secured by keys derived using BIP32...

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

bitcoin

Bitcoin Optech newsletter #403 is here:

- describes research around using binary fuse filters as an alternative to the GCS used in compact block filters
- links to an idea for post-quantum HD wallets with fallback SPHINCS keys
- summarizes discussion of a post-quantum output type
- examines a proposal to embed post-quantum keys in tapscript without consensus changes
- summarizes results of a BIP54 demonstration of slow blocks on signet
- links to work on post-quantum BIP86 recovery using zk-STARK proofs of BIP32 seeds
- Optech Newsletter #403 Podcast
https://bitcoinops.org/en/newsletters/2026/05/01/

Csaba Purszki posted to Delving Bitcoin his research on finding a better alternative to Golomb-Rice Coded Sets (GCS) used for compact block filters as defined in BIP158...
https://bitcoinops.org/en/newsletters/2026/05/01/#binary-fuse-filters-as-an-alternative-to-bip158-s-gcs

In a post on the Bitcoin-Dev mailing list, Conduition described a design for post-quantum BIP32 congruent hierarchical deterministic wallets with fallback SPHINCS keys...
https://bitcoinops.org/en/newsletters/2026/05/01/#post-quantum-hd-wallets-with-fallback-sphincs-keys

Antoine Poinsot wrote to the Bitcoin-Dev mailing list defending a plain post-quantum output type (as opposed to a P2TR-like output type which allows quantum-vulnerable key spending to be disabled by a later soft fork)...
https://bitcoinops.org/en/newsletters/2026/05/01/#discussion-of-a-post-quantum-output-type

Daniel Buchner sent a proposal to the Bitcoin-Dev mailing list which describes a potential path to enabling flexible post-quantum wallet designs without fully describing the signature validation parameters...
https://bitcoinops.org/en/newsletters/2026/05/01/#proposal-to-embed-post-quantum-keys-in-tapscript-without-consensus-changes

On Delving Bitcoin, Antoine Poinsot wrote about a demonstration of the types of slow-to-validate blocks that BIP54 (consensus cleanup) prevents...
https://bitcoinops.org/en/newsletters/2026/05/01/#bip54-demonstration-of-slow-blocks-on-signet

Olaoluwa Osuntokun (roasbeef) posted on the Bitcoin-Dev mailing list his project to demonstrate zk-STARK recovery of quantum-vulnerable coins secured by keys derived using BIP32...
https://bitcoinops.org/en/newsletters/2026/05/01/#post-quantum-bip86-recovery-using-zk-stark-proofs-of-bip32-seeds

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