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Zero-knowledge proofs are emerging as a key technology for scaling blockchain networks, moving beyond their original focus on privacy.
Speaking at ETHDenver, Alpen Labs co-founder and CEO Simanta Gautam said the technology allows complex computations to be verified without requiring every participant to process them.
How zero-knowledge proofs scale computation
Instead of each node validating large datasets, a single entity performs the computation and generates a proof that others can quickly verify.
A zero-knowledge proof changes the model. One server performs the heavy computation, then produces a small cryptographic proof that anyone else can verify quickly.
“What a zero-knowledge proof allows us to do is have some single server do that computation, generate a cryptographic proof, just like a signature, that could be verified by anyone,” Gautam said. “Your mobile phone can verify it without actually verifying 100,000 transactions.”
That ability is powerful because it turns expensive computation into a lightweight verification problem.
Instead of rerunning a huge program, a device only needs to check a compact proof. Gautam said that is important in environments with limited processing power, including phones and even Bitcoin itself, which is intentionally restrictive.
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Privacy, built in
The technology also has a privacy side. A system can prove that transactions are valid or that a condition is met without exposing the details behind it.
One example is identity, where a user could prove they are over 21 without handing over a full driver’s license.
“Someone can get a cryptographic guarantee that those transactions are valid without knowing the internal information,” he said.
So far, much of the adoption has happened around Ethereum rollups and layer 2 networks, where zero-knowledge proofs help compress activity and lower costs.
Gautam said the opportunity may be even more interesting on Bitcoin, where the base layer is more limited.
“And so these layer-2s that could be built with zero-knowledge proofs allow us to completely expand the horizon for the kinds of markets that could exist directly and be secured directly on Bitcoin,” he said.