# A Live Ethereum Rollup Drops Elliptic-Curve Signatures for Hash Chains as Post-Quantum Designs Move Toward Production

The bb84 payments rollup authenticates every layer-2 transaction with keccak-256 preimages, while new research and Aztec's 2030 roadmap show the cost and the long timelines of quantum migration.

- Published: 2026-10-26T05:45:33.692Z
- Canonical: https://polylog.news/crypto/2026-10-26/a-live-ethereum-rollup-drops-elliptic-curve-signatures-for-h
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Ethereum Research](https://ethresear.ch/t/a-hash-only-rollup-op-stack-l2-accounts-as-lamport-style-hash-chains-no-ecdsa-inside-the-l2/26172), [BB84](https://bb84.com/), [arXiv cs.CR](https://arxiv.org/abs/2610.31814), [Aztec Network](https://aztec.network/blog/post-quantum-aztec), [The Defiant](https://thedefiant.io/news/blockchains/aztec-targets-full-post-quantum-migration-by-end-of-2030)

The founder of bb84, a payments app, has described on Ethereum Research an OP Stack rollup that has run on Ethereum mainnet since Sept. 30 with no signatures inside its layer 2 (L2). The founder disclosed the commercial interest and asked f…

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