Mobile payment startup Square open sources its Bitcoin cold storage

posted 7 months ago
Mobile payments startup Square is making its Bitcoin cold storage solution open source. Alok Menghrajani, a security engineer at Square, said the documentation, code, and tools of the company's Subzero Bitcoin cold storage solution are now publicly available on Github. Subzero is the same technology Square has been using to store encrypted keys for its other payments services.

Menghrajani said Subzero is "programmable" & that it can send Bitcoin from a hot wallet to the cold storage at any time. When doing the opposite, however, the program requires multi-party signatures to initiate a transaction to bring Bitcoin storage from offline to online. Square, founded by the co-founder and CEO of Twitter Jack Dorsey, operates Bitcoin trading in all 50 states in the US.
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