Update BITCOIN-CO2.md
Update BITCOIN-CO2.md
openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains