rbenv install 3.2.2
rbenv local 3.2.2
bundle install
bundle exec rspec
ruby main.rb -p 1910
curl -X POST http://localhost:1910/chain
curl -X POST -H 'Content-Type: application/json' -d '{"data": "your_data"}' http://localhost:1910/chain/:chain_id/block
curl -X POST -H 'Content-Type: application/json' -d '{"data": "your_data"}' http://localhost:1910/chain/:chain_id/block/:block_id/valid