Quantum-safe signing live on mainnet since July 20

Which Crypto Is Actually Quantum-Resistant in 2026? I spent some time researching quantum risk because most discussions treat it as either an immediate crisis or a problem too distant to matter. I think both views miss the key issue as no quantum computer can break Bitcoin today. Current estimates suggest that cracking a 256-bit elliptic-curve key would require around 1,200-1,450 logical qubits. IBM’s 2029 target is roughly 200. But the relevant risk for investors is whether major networks can complete a coordinated migration before quantum hardware reaches that threshold. A full migration could take close to a decade, but current Q-Day estimates cluster around 2030-2033. That explains why #Bitcoin, #Ethereum, @solana, @Ripple, @Algorand, @Aptos and @NEARProtocol are already working on post-quantum security. After reviewing their progress, I would separate them into 3 groups. [1] Quantum-resistant today @QRLedger has used XMSS, a hash-based signature system, since its mainnet launched in 2018. It was designed around post-quantum security from the start, so it does not carry the same migration problem as older chains. @Starknet also has an architectural advantage because STARK proofs rely on hashes rather than elliptic-curve cryptography. Its Falcon-based S2morrow wallet adds another quantum-resistant option. [2] Live or close to implementation $NEAR currently stands out among major L1s. Quantum-safe signing using ML-DSA-65 went live on mainnet on July 20. Users can add a post-quantum key without moving assets or waiting for a hard fork. $ALGO has used Falcon in State Proofs since 2022 and has already completed a quantum-resistant mainnet txn. Native Falcon-1024 accounts are expected from Q3 2026, with broader protection targeted by the end of 2027. $APT supports an opt-in path through SLH-DSA and account-level key rotation. Coinbase’s Advisory Council ranked Aptos and Algorand as the most prepared major chains. These are the projects I consider most technically ready today: QRL NEAR Algorand Aptos Starknet [3] Major chains with active migration plans Bitcoin is not quantum-resistant yet. – BIP-360 proposes a quantum-safe output type, while BIP-361 outlines a phased retirement of vulnerable ECDSA and Schnorr signatures. – The difficult part is the existing supply. – Around 6.9m BTC sit in addresses with exposed public keys. That includes roughly 1.1m BTC attributed to Satoshi. Ethereum is also not quantum-resistant yet. – Its BLS validator signatures and KZG commitments remain vulnerable to Shor’s algorithm. – The Lean Ethereum roadmap proposes hash-based signatures, quantum-resistant blobs and recursive STARK proofs. – The expected transition begins around 2029, with broader implementation in the early-to-mid 2030s. Other timelines are moving faster: – XRP targets full post-quantum protection by 2028. – Solana has Falcon implementations and an opt-in Winternitz Vault. – @Zcash targets full post-quantum cryptography around 2027. – @trondao has announced testnet and mainnet plans, but has not disclosed its exact scheme. My main takeaway is financial, the market is not rewarding quantum readiness yet. An equal-weight basket of 12 quantum-migrating chains was down around 36% YTD as of July 31, compared with Bitcoin at roughly -26%. So I would not treat quantum-resistant as a standalone investment thesis. QRL being quantum-native does not automatically give it stronger demand. NEAR enabling ML-DSA does not immediately change its fees, users or capital flows. Quantum readiness is better understood as long-term infra risk management. For Bitcoin and Ethereum, the main issue is execution with governance, wallet migration, custody coordination and the treatment of assets that never upgrade. For smaller chains, the question is whether technical readiness can translate into adoption. Personally, I am not worried about an immediate quantum attack. But I am paying attention to which networks are shipping working solutions instead of only publishing roadmaps. They will be the ones that make migration simple enough for users, validators and institutions to actually complete.