Armory
The Only Open-Source Wallet With Cold Storage And Multi-Signature Support
Armory is an open-source Bitcoin wallet built around cold storage and multi-signature control. Private keys are generated and held on an air-gapped offline computer, while an online watching-only wallet is used to prepare transactions for signing and broadcast. The software is free to use, and the project also provides enterprise consulting for exchanges, trusts, hedge funds and other large Bitcoin holders.
Core capabilities include encrypted wallets, permanent one-time paper backups, distributed multi-signature addresses through Lockboxes, and transaction signing on the offline system. The project is designed to be extensible for developers building Bitcoin applications such as exchanges and crowdfunding platforms. The site lists video tutorials, an FAQ, and enterprise security consulting services. The homepage notes a repository update intended to make Armory usable as an iOS mobile app.
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