fiatjaf.com/nostr mod for TinyGo/Wasm has started working. There are likely some trade-offs. I still need to check whether everything I need will actually run.

GitHub

GitHub - nosuta/nostr

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Comparison with standard Go/Wasm: - Binary size: < 0.1x - Execution speed: similar or slightly slower (with opt=2) - Memory usage: ~0.75x