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The Canaan AvalonMiner 721 is hardware blockchain securing hardware technology built using Open Source software. The latest hardware AvalonMiner 721 contains 72 customized ASIC processors named Canaan A3212 which are harmonized together and then across potentially thousands of other AvalonMiners, to do SHA-256 hashing calculations.From the software toolchain all the way to OpenWrt used in Canaan's AvalonMiner Controller, this presentation describes the entire process from start to finish how the software is built, developed, launched and maintained. Of specific interest are the contributions by Canaan back to the Open Source community, including to CGMiner, OpenWRT and other projects.