Evaluate Rúnar compiler for on-chain contract logic

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Context

Rúnar is a multi-language Bitcoin Script compiler (MIT licensed) by @icellan (Siggi). Write contracts in TypeScript/Go/Rust/Python/Solidity/Move → compile to Bitcoin Script. All compilers produce byte-identical output.

Why this matters for $402

1. Payment contracts in TypeScript — write $402 payment verification as typed contracts instead of raw opcodes
2. Token contracts — BSV-21 token logic as proper TypeScript classes with IDE autocomplete
3. Multi-signer flows — prepareCall()/finalizeCall() enables Divvy revenue distribution escrow
4. BRC-100 wallet integration — WalletSigner delegates to BRC-100 wallets (HandCash compatible)
5. Post-quantum — hybrid ECDSA + WOTS+ wallets (~19KB) verified on-chain
6. Stateful contracts — state management + UTXO tracking for PoI mining state

Key features (v0.2)

• 6 input languages, 4 compiler implementations
• 4 deployment SDKs with real on-chain deployment
• Teranode integration (Docker Compose testing)
• 400+ integration tests on regtest
• ANF EC optimizer (saves ~1500 bytes per ecMul)
• Off-chain runtime simulation for testing without blockchain

Evaluation plan

• Install and test TypeScript compiler with simple P2PKH contract
• Prototype $402 payment verification contract
• Test deployment SDK against BSV testnet
• Evaluate integration path for @path402/client SDK
• Benchmark compiled script sizes vs hand-written opcodes

References

• GitHub: https://github.com/icellan/runar
• Author: @icellan (Siggi) — active BSV developer
• License: MIT
• Announcement: Rúnar v0.2 thread (Mar 9, 2026)