Bitcoin Optech Newsletter #428

Bitcoin Optech newsletter #428 is here:

• describes a design for a single-issuer layer 2 whose users can redeem their bitcoin onchain without the issuer’s cooperation
• summarizes a proposal for including hash preimages in output script descriptors.
• summarizes changes to services/client software
• Optech Newsletter #428 Podcast https://bitcoinops.org/en/newsletters/2026/10/23/

Adam Gibson posted to the Bitcoin-Dev mailing list a paper and proof-of-concept code for Lichen, a design in which a single issuer, which Gibson calls a hub, mints tokens redeemable one-to-one for bitcoin on a layer 2 ledger run by a server called the sequencer... https://bitcoinops.org/en/newsletters/2026/10/23/#trust-minimized-exits-from-a-single-issuer-layer-2

João Dias posted to Delving Bitcoin a proposal for extending BIP379 to add a private form for hash fragments to miniscript... https://bitcoinops.org/en/newsletters/2026/10/23/#descriptor-syntax-for-hash-preimages

Changes to services and client software:

• Ibis Wallet v5.0-beta released
• Landfall wallet for Lightning mining payouts
• rbitcoin 0.8.0 released https://bitcoinops.org/en/newsletters/2026/10/23/#changes-to-services-and-client-software

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