This week on TezTalks Radio, we’re joined by Arthur Breitman, co-founder of Tezos, for a deep conversation about TzEL, an experimental project exploring private, post-quantum payments on Tezos testnet.
At the center of the discussion is a deceptively simple question:
If blockchain data can remain public forever, what does privacy actually mean over time?
Rather than treating privacy as a momentary concern, this episode looks at the long-term reality of encrypted transaction data that may still exist decades from now — and what happens if future cryptographic assumptions change.
🎙️ The conversation moves through private payments, post-quantum cryptography, rollups, the DAL, and the engineering realities of turning research ideas into working systems.
🔍 In this episode, we explore:
Why blockchain privacy has a “time problem”
What kinds of transaction data remain exposed long term
Why Arthur became interested in private post-quantum payments specifically
What TzEL is actually testing — and what it is not claiming yet
How Tezos’ long-term adaptability connects back to post-quantum design
The difference between a research prototype and production infrastructure
What had to be built to make TzEL function end to end
Why proof size becomes a major constraint for private systems
How the Tezos DAL changes what becomes practical
Why heavier cryptographic systems may naturally live in rollups
How viewing keys, detector keys, and selective disclosure work in practice
What this experiment reveals about the future design space for Tezos
This is one of the clearest conversations yet on how Tezos infrastructure, rollups, governance, and long-term adaptability connect together underneath the surface.
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