Create proof_of_work.rb
Create proof_of_work.rb
openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains,openblockchains/awesome-blockchains