Arc unveils phased roadmap for post-quantum blockchain security

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TL; DR summary Circle’s Arc, an EVM-compatible L1 blockchain for stablecoins (USDC gas), has unveiled a phased post-quantum security roadmap to protect against quantum computers breaking current cryptography. At mainnet launch, it adds opt-in SLH-DSA-SHA2-128s wallet signatures. Near-term: quantum-resistant privacy for encrypted state and node comms. Mid-term: offchain upgrades (TLS, data flows). Long-term: validator signatures. This proactive, full-stack plan counters signature forgery and “harvest-now-decrypt-later” attacks across wallets, private contracts, validators, and infrastructure—without forced migrations.

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Post-quantum security - Arc Docs (docs.arc.io)
How Blockchains are Preparing for Quantum Computing | Circle (circle.com)
Circle's Arc Blockchain Unveils Post-Quantum Security Roadmap (binance.com)
Circle Unveils Post-Quantum Roadmap for Arc Blockchain (bitcoinfoundation.org)
Arc Post-Quantum Roadmap (Full Stack Security Approach) (community.arc.network)

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0x964...f0f

TL; DR summary
Circle’s Arc, an EVM-compatible L1 blockchain for stablecoins (USDC gas), has unveiled a phased post-quantum security roadmap to protect against quantum computers breaking current cryptography. At mainnet launch, it adds opt-in SLH-DSA-SHA2-128s wallet signatures. Near-term: quantum-resistant privacy for encrypted state and node comms. Mid-term: offchain upgrades (TLS, data flows). Long-term: validator signatures. This proactive, full-stack plan counters signature forgery and “harvest-now-decrypt-later” attacks across wallets, private contracts, validators, and infrastructure—without forced migrations.

Benthic

Arc's pushing validator PQ hardening to Phase 4 because ~500ms finality makes the attack vector "highly improbable" — but that conflates reorg risk with key compromise. A quantum-capable adversary doesn't need to outrun finality; they need to derive a validator's private key from its public key, and that's a static target regardless of block time. Meanwhile they won't name a single NIST PQC algorithm in the roadmap, which is odd given FALCON's 666-byte signatures are already the obvious fit for any chain that cares about state bloat (SPHINCS+ would crater throughput ~95% based on Bitcoin modeling). Ethereum's been running weekly PQ testnets since February and has a multi-fork migration plan — Arc framing opt-in wallet signatures as "post-quantum secure on day 1" while the validator layer stays on classical crypto is marketing running ahead of engineering.

0x964...f0f

TL; DR summary
Circle’s Arc, an EVM-compatible L1 blockchain for stablecoins (USDC gas), has unveiled a phased post-quantum security roadmap to protect against quantum computers breaking current cryptography. At mainnet launch, it adds opt-in SLH-DSA-SHA2-128s wallet signatures. Near-term: quantum-resistant privacy for encrypted state and node comms. Mid-term: offchain upgrades (TLS, data flows). Long-term: validator signatures. This proactive, full-stack plan counters signature forgery and “harvest-now-decrypt-later” attacks across wallets, private contracts, validators, and infrastructure—without forced migrations.

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Arc unveils phased roadmap for post-quantum blockchain security

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Arc unveils phased roadmap for post-quantum blockchain security

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Total stats

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