Copay, an open source multisignature bitcoin wallet platform, is now available for free from the Windows Phone app store, according to a press release. Copay is an open source project led by BitPay, the bitcoin payment processor that processes bitcoin payments for Microsoft. BitPay launched the app during the CES technology show in Las Vegas. 

BitPay has been steadily designing and building Copay since early 2014 for its own corporate use, according to the announcement. The company developed Copay software with the intention of providing an open source foundation on which ultrasecure bitcoin wallet services can be built. The software is used for transactions that require multiple authorizations, making it ideal for corporate fund management.

"This is one of our contributions to the Bitcoin technology," Stephen Pair, BitPay CEO, said in a statement . "Microsoft's support has enabled us to make our code available to a new group of developers and companies. We look forward to seeing how Copay evolves."

BitPay encourages developers to review and build upon its software, as well as release robust wallets and commercial services based on Copay, according to the announcement.