OP_CAT: The Key to Bitcoin Privacy?

[nihalsari]

Ben-Sasson says Bitcoin could gain privacy, scalability, and post-quantum security with a simple soft fork restoring OP_CAT, an opcode Satoshi disabled in 2010.
With Zcash’s 2025 resurgence, he hopes Bitcoiners will finally consider integrating zk-tech directly into the protocol.

[alex10]

If OP_CAT unlocks real privacy layers, Bitcoin’s use cases could expand massively.

[The_Walking_Dead]

OP_CAT is basically the gateway to bringing Bitcoin into the zk era. Once you add native programmability + privacy, the entire design space blows open.

[Abdul Khan]

Privacy upgrades are overdue—this could be a game-changing primitive.

[Capybara_Capybara]

If OP_CAT actually enables zk primitives on BTC, that’s a game-changer. Privacy + scalability on the base layer is a whole new chapter.

[Revenant]

OP_CAT could be Bitcoin’s bridge into zk-tech. That’s when the real adoption wave starts.