TLDR
- Tezos launched TzEL, a post-quantum privacy system for blockchain payments, currently live on testnet
- TzEL uses post-quantum cryptography and zk-STARK proofs to protect transaction data from future quantum attacks
- Tezos co-founder Arthur Breitman criticized parts of the crypto community for dismissing quantum risks
- Quantum security firm Project Eleven warns Q-Day could arrive as early as 2030
- Bernstein researchers say the industry has roughly three to five years to transition to quantum-resistant standards
Tezos has launched a testnet prototype called TzEL, a post-quantum privacy system designed to protect blockchain payment data from future quantum computing attacks.
🔍 Private transactions today may not stay private forever.
Introducing TzEL → an experimental Tezos Smart Rollup exploring private post-quantum payments.
Built using quantum-resistant cryptography via STARK proofs and Tezos Smart Rollup technology.
Learn more ↓
🔗…
— Tezos (@tezos) May 14, 2026
The system uses post-quantum cryptography combined with zk-STARK proofs to shield transaction data and encrypted payment metadata. The concern it addresses is known as a “harvest now, decrypt later” attack, where encrypted blockchain data collected today could be decrypted in the future once quantum computers are powerful enough.
Blockchain data is stored permanently on public ledgers. That means any data recorded today remains exposed indefinitely, making it a potential target once quantum computing reaches a high enough capability.
One technical challenge with quantum-resistant systems is size. The zk-STARK proofs used by TzEL are roughly 300KB each, which is much larger than the privacy proofs used in most existing blockchain tools. Tezos says its Data Availability Layer can handle those larger proof sizes without adding load to consensus nodes.
TzEL is live on testnet and still in development. Tezos is also working on post-quantum signature support for user accounts as part of a broader network upgrade effort.
Industry Debates the Timeline
Tezos co-founder Arthur Breitman said the project is acting with urgency while parts of the industry remain complacent. He was direct in criticizing some in the Bitcoin community.
“There are Bitcoiners being applauded on stages for half-baked crank theories about quantum mechanics that fly in the face of established physics,” Breitman said.
Not everyone shares his sense of urgency. Adam Back, an early Bitcoin contributor, said computers capable of breaking Bitcoin signatures are likely still at least 20 years away. Fireblocks CEO Michael Shaulov has also said the quantum threat is “not actually a threat as people make it out to be.”
Breitman pushed back on that view. “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,” he said. “That leaves enough time to upgrade, but not enough to quibble.”
Quantum security firm Project Eleven has warned that Q-Day, the point at which quantum computers can break modern cryptography, could arrive as early as 2030.
Other Blockchains Are Also Preparing
Tezos is not alone in working on quantum resistance. Two major validator clients on the Solana network introduced a test version of a post-quantum signature system called Falcon in April.
MARA Holdings launched the MARA Foundation to support Bitcoin development, including research into quantum-resistant security. Coinbase researchers said Algorand and Aptos appear further along than most in integrating quantum-resistant cryptography.
Bernstein researchers estimate the crypto industry has three to five years to transition before quantum computing becomes a real threat to Bitcoin security.
Breitman said the main risk is developer complacency. “Work to make the entirety of Tezos post-quantum is active and ongoing,” he added.
