Built a free tool that scores whether an Ethereum address is already quantum-harvestable

Been thinking about the post quantum migration for a while and built a small tool that scores exposure risk for any Ethereum address.

How it works: every ECDSA signed transaction reveals the signer's public key on chain. Once you have sent one transaction from an address, that public key is on chain permanently. If a sufficiently capable quantum computer arrives, it can derive the private key from that public key using Shor's algorithm.

The tool takes any EVM address or ENS name and returns:

- Whether the public key is already on chain (exposed)

- The value at risk

- How long the exposure has existed

- A 0 to 100 exposure score

Read only. No wallet connection. No signup.

claak.io/scan

Vitalik.eth is prefilled as a demo.

The scanner is free and standalone. Full disclosure: I contribute to Claak, but this post is about the scanner as an open piece of crypto tooling for the community. Google's March paper cut the qubit threshold to roughly 1,152 logical qubits. Eigen Labs' open ecdsa.fail benchmark is past Google. NSA has set 2030 as the migration deadline.

Happy to walk through methodology if anyone is curious. What score

did you get on your main address?