Entropylab

Offline, air-gapped Bitcoin key and wallet calculator for cold storage and recovery.

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Entropylab is a free, open-source, fully offline, air-gapped Bitcoin key and wallet calculator that turns entropy, seed phrases, or private keys into BIP39 seeds, addresses, and recovery data, and can build watch-only multisig wallets without exposing keys online. It's aimed at Bitcoin holders setting up cold storage who need to generate or verify keys offline.

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