Bitcoin Script Has Two Distinct Architectures, Not One: A Technical Breakdown

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A technical essay published on DEV Community by Aaron Recompile on December 2, 2025 argues that most confusion around Bitcoin scripting stems from conflating two separate architectural models. The first is a universal commit-reveal philosophy, where every Bitcoin output type locks funds by committing to a condition and unlocks them by revealing a satisfying proof. The second is a dual-layer execution structure, which applies only to P2SH, P2WSH, and Taproot script-path transactions, separating an outer commitment layer from an inner script execution layer. Single-layer formats such as P2PKH and Taproot key-path spend do not involve a revealed inner script, making them architecturally simpler. The piece, companion notes to the book Mastering Taproot, contends that understanding this distinction clarifies longstanding questions about why certain locking scripts contain no opcodes and why SegWit moves logic into the witness.

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