ChainCatcher report: Mert, CEO of Helius, a Solana infrastructure company, posted that Anthropic and Claude are using the same cryptographic technology pioneered by Zcash.
According to Anthropic’s official website, Anthropic open-sourced the research prototype FlashProve on November 2, enabling "provable reasoning" using zero-knowledge proofs (zkSNARKs)—allowing model providers to prove that a given response was genuinely generated by their stated model without revealing the model weights.
According to the information provided, the provider first publishes a commitment to the model weights offline, then generates a proof for each request, which users can verify in seconds on a standard CPU. For example, with Llama 4 Maverick, which has 400 billion parameters, a single H100 GPU can generate approximately 110 tokens of proof per second, with each proof for a 1024-token request being about 19 MB. The system was optimized with input from Claude, and its security properties are formally specified using Lean.
Anthropic states that the current proof cost is approximately 70–95 times that of standard inference GPU time, and it remains a research prototype, not yet production-ready.
Anthropic Uses Zcash's Pioneering Cryptography in FlashProve Prototype
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Summary
Anthropic is using Zcash’s elliptic curve cryptography in its FlashProve prototype, announced on November 2. The open-source system employs zkSNARKs to enable provable reasoning, allowing model providers to verify outputs without exposing model weights. On-chain data transparency is a key benefit, though Anthropic notes that proof generation costs are 70–95 times higher than standard GPU inference. The project remains a research prototype.
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