Building secure obfuscation has proved brutally hard. An ideal version was proven impossible in 2001, which sent researchers after the weaker iO target instead, a roughly two-decade effort littered with broken attempts. The recent good news is that iO can now be built under reasonable security assumptions.
However, the downside is that the runtimes are, in Buterin’s word, “galactic,” efficient on paper but absurdly slow in practice.
Buterin compared the moment to where SNARKs, the zero-knowledge proofs now central to Ethereum’s scaling, sat around 2010, before years of optimization turned them from a curiosity into working infrastructure. The suggestion is that obfuscation could travel the same road from theoretical breakthrough to usable tool, even if a single run today would be hopelessly expensive.
Privacy coins like Monero (XMR) already hide things on a live blockchain, so why does Buterin treat this as unsolved? Because they hide different things. Monero obscures transaction data, such as who paid whom and how much, through ring signatures, stealth addresses and confidential amounts.
Obfuscation in Buterin’s sense hides the program’s logic, the code itself, not the data flowing through it. As he puts it, iO hides the code, not the data. Monero has done transaction privacy for over a decade, but program obfuscation has never run in production anywhere, and closing that gap is what his post is about.
