Crypto & Blockchain · Wed, Nov 4, 2026

Bitcoin, Ethereum, stablecoins, DeFi, smart contracts, scaling and consensus.

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IACR ePrint Cryptographic protocols

Blockchain-Anchored Proactive Refresh for Dynamic Threshold Services

In briefBlockchain-anchored proactive share refresh for dynamic threshold services

SummaryThis paper addresses long-lived threshold services that must admit new participants, refresh shares against mobile adversaries, and let offline participants recover missed updates. It shows that tracking exposure only for committed epochs is insufficient, and it instead budgets security per fine-grained state, including aborted refresh attempts, using an append-only release ledger. Encrypted update records are stored in blockchain blob storage, and an on-chain bisection dispute protocol identifies faulty records. An end-to-end Rust implementation on an EVM chain benchmarks lifecycles with up to 1,280 participants, reporting sub-second group recovery and practical gas costs.

Seunghyun Cho, Jaeyeon Lee, Myeongjun Kim et al.

IACR ePrint Cryptographic protocols

Shielded Bitcoin: Private Transfers on the Bitcoin L1

In briefShielded Bitcoin: a protocol for private transfers directly on Bitcoin's base layer

SummaryThis paper presents Shielded Bitcoin, a protocol for private Bitcoin transfers on the base layer that requires no changes to Bitcoin consensus. Value is held as encrypted notes, spends are marked with public nullifiers, and validity is proven with zero-knowledge proofs. All protocol data is published on Bitcoin, and shielded state is rebuilt off-chain by replaying accepted transfers in Bitcoin order.

Clara Shikhelman, Mikhail Komarov, Aleksei Moskvin