Update blockchain_with_proof_of_work.rb
Update blockchain_with_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