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Blockstream Research
Blockstream
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Blockstream Research

Blockstream
@blksresearch
research.blockstream.com
Joined October 2022
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    Blockstream Research
    Blockstream
    @blksresearch
    Aug 7
    Standardized parameter sets for hash-based signatures weren’t chosen for Bitcoin. For a SHRINCS proposal, we can trade some of SLH-DSA's enormous signature budget for smaller signatures and cheaper verification. We searched 25,935 parameter sets and found a 5.7 kB candidate, 26%
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    Blockstream Research
    Blockstream
    @blksresearch
    Jul 17
    An aggregate signature lets multiple signers each sign a different message, then combine everything into one compact signature that proves who signed what. @real_or_random explains the primitive behind Cross-Input Signature Aggregation. Full talk at Eurocrypt below. ⬇️
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    Blockstream Research
    Blockstream
    @blksresearch
    Jul 2
    Replying to @blksresearch
    youtu.be/ir7U-_iyu0Y?t=…
  • user avatar
    Blockstream Research
    Blockstream
    @blksresearch
    Jul 7
    Full aggregation for BIP340 signatures, now as a draft BIP. It specifies DahLIAS, an aggregate signature scheme and can serve as a basis for future cross-input signature aggregation (CISA) proposals. Thanks to @fjahr for the spec work. More background on DahLIAS 👇
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    light 📜
    @lightcoin
    Jul 6
    BIP draft: Full-Aggregation of BIP 340 Signatures by @fjahr 👀 groups.google.com/g/bitcoindev/c…
    Abstract

This document describes full-aggregation of BIP 340 signatures, a standard for the DahLIAS interactive aggregate signature scheme. Full-aggregation is an interactive process for aggregating a collection of signatures into a single aggregate signature. The resulting aggregate signature has the same size as a single BIP 340 signature (64 bytes), regardless of the number of signers.
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    Blockstream Research
    Blockstream
    @blksresearch
    Jul 2
    The DahLIAS Eurocrypt talk by @real_or_random is online now! It focuses on what it takes to deploy signature aggregation in Bitcoin: pitfalls, attacks, and practical requirements. DahLIAS is not post-quantum, but many of these issues matter for PQ aggregate sigs too. 👇
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    Blockstream Research
    Blockstream
    @blksresearch
    Mar 11
    Excited to share that our DahLIAS paper has been accepted to Eurocrypt 2026! 🎉 DahLIAS enables cross-input signature aggregation (CISA) on Bitcoin’s secp256k1 curve. See you in Rome, May 10–14! Thanks to @yannickseurin (@Ledger), @real_or_random & @n1ckler (@blksresearch)!
  • user avatar
    Blockstream Research
    Blockstream
    @blksresearch
    Jul 2
    Stateful signatures trade systemic risk for localized risk. The failure mode is confined to individual wallets, not the network. @n1ckler at @TheBitcoinConf 2026 on why that's the better trade-off to explore.
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