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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.