Tezos is racing to future-proof privacy against quantum threats as its co-founder lashes out at what he calls “half-baked” Bitcoin rhetoric on the topic.
What’s happening
- Tezos has launched TzEL on testnet — a post-quantum privacy system designed to protect private payments and encrypted transaction data against “harvest now, decrypt later” attacks, where adversaries store on‑chain ciphertext today and wait for future quantum computers to break current cryptography.
- Arthur Breitman, Tezos’ co-founder, told Decrypt the project is moving with “a sense of urgency,” and the network is also rolling out post‑quantum signature support for user accounts as part of a broader hardening effort.
Why it matters
- Most blockchains rely on elliptic curve cryptography (ECC). If sufficiently powerful quantum computers arrive, ECC could be broken, exposing private keys and permanently recorded on‑chain data.
- Because blockchain records are immutable and public, encrypted memos and transactions captured today could be decrypted later — creating a long‑term theft risk unless systems are updated in advance.
Technical hurdles and Tezos’ approach
- Post‑quantum proofs such as zk‑STARKs are far larger than the proofs used by many existing privacy tools, creating storage and throughput challenges.
- Breitman says Tezos is ready for that scale: the network has a functioning data availability layer that can store larger shielded transactions without increasing the load on consensus nodes, making the approach feasible at scale — though TzEL remains experimental and several steps are required before wider deployment.
Industry debate and criticism
- The move has reignited a cultural debate: should blockchains begin upgrading now for a potential quantum future, or is the risk overblown?
- Breitman criticized parts of the Bitcoin community for promoting what he described as “pseudo‑scientific” theories about quantum mechanics, calling some public discourse “half‑baked.” He contrasted this with projects that are “barely maintained” and won’t be upgraded, versus “important ones” that will be upgraded “mostly in a timely fashion.”
Timing and urgency
- Breitman believes there’s still time to act, but warned developers are underestimating how fast the window to prepare could close. He pointed to recent analysis from quantum security firm Project Eleven, which suggested “Q‑Day” — the moment quantum computers can break modern cryptography — could arrive as early as 2030.
- “Elliptic curve signatures won’t be broken in a few months, but there’s a good chance they’ll be broken in a few years,” Breitman said. “That leaves enough time to upgrade, but not enough to quibble.”
Bottom line
Tezos is betting on early, practical defenses: experimenting with post‑quantum shielded transactions and signatures while addressing the scalability tradeoffs that come with quantum‑resistant proofs. Whether the rest of the industry follows suit — or continues to debate the physics and timelines — could decide how much of today’s on‑chain data remains secure tomorrow.
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