An open-source application to create self-spend BTC transactions with a custom output. The custom output can hold up to 80 bytes as a message. You can write anything up on the blockchain.
git clone https://github.com/NotesOnBlockchain/WriteUpApp.git
cd WriteUpApp
dotnet build && dotnet runIf a transaction contains:
OP_RETURN 48656c6c6f20576f726c64The decoded message will be:
"Hello World"