HashThis is a lightweight, open-source dApp for proving data existence and integrity using the Nervos CKB blockchain. It allows users to generate cryptographic hashes locally, anchor those hashes on CKB testnet, and later verify that the same data existed at a specific point in time without revealing the original content.
The project focuses on simplicity, privacy, and verifiable timestamped proofs rather than data storage. No files are uploaded or stored by the application; only deterministic hashes are written on-chain. Verification is performed by re-hashing the same data locally and comparing it with the on-chain record.
HashThis is designed as a small, runnable prototype demonstrating a practical Web5-style use case for CKB: user-controlled data verification with minimal infrastructure.