EntropyLab has released the first release candidate of its self-contained Bitcoin key and wallet calculator, v1.0rc1. According to ChainCatcher, the application runs as a single HTML file, requires no internet connection, and does not generate entropy on its own, allowing users to supply their own entropy and compute keys and wallets in a fully offline environment.

The tool supports multisignature, PSBT, BIP-85, Silent Payments, vanity addresses, watch-only wallet export, and random number analysis. The release is reproducible and can be verified through signatures from four independent signers. The team said users should download and verify the file before moving it to an air-gapped computer, and that the final v1.0 release will follow after testing of the candidate version is completed.