Experiment with Bitcoin smart contracts in your browser. Andrew Poelstra of nostr:nprofile1qyvhwumn8ghj7urjv4kkjatd9ec8y6tdv9kzumn9wshsz9nhwden5te0wfjkccte9ec8y6tdv9kzumn9wsqzpy3fg4melylapvm4nug40c7...