Module script 

Script execution engine from Orange Paper Section 5.2

Performance optimizations (VM):

• Secp256k1 context reuse (thread-local, zero-cost abstraction)
• Script result caching (production feature only, maintains correctness)
• Hash operation result caching (OP_HASH160, OP_HASH256)
• Stack pooling (thread-local pool of pre-allocated Vec)
• Memory allocation optimizations

Enums

SigVersion

Script version for policy/consensus behavior (BIP141/BIP341 SigVersion)

Functions

batch_verify_signatures

Spec-locked to Orange Paper Section 5.2: BatchVerifySignatures

cast_to_bool

CastToBool: truthiness check for stack elements (BIP62/consensus). Returns true if ANY byte is non-zero, except for “negative zero” (0x80 in last byte, rest zeros).

clear_all_caches

Clear all caches

clear_hash_cache

Clear hash operation cache

clear_script_cache

clear_stack_pool

Clear thread-local stack pool

disable_caching

Disable caching for benchmarking

eval_script

Spec-locked to Orange Paper Section 5.2: EvalScript

p2sh_push_only_check

Spec-locked to Orange Paper Section 5.2.1: P2SHPushOnlyCheck

reset_benchmarking_state

Reset all benchmarking state

to_stack_element

Convert bytes to StackElement (for tests and callers needing explicit conversion).

try_verify_p2pk_fast_path

Spec-locked to Orange Paper Section 5.2: TryVerifyP2pkFastPath

try_verify_p2pkh_fast_path

P2PKH fast-path. Returns Some(Ok(bool)) if script is P2PKH and we handled it; Returns None to fall back to full interpreter.

verify_p2pk_inline

P2PK (Pay-to-Public-Key) inline verify.

verify_p2pkh_inline

Fully inlined P2PKH verification for the rayon fast path. Caller MUST have already verified script_pubkey is a valid P2PKH (25 bytes, correct opcodes). Eliminates: redundant pattern check, Option unwrapping for precomputed values (always None), assumevalid lookup, sighash cache overhead. Returns Ok(true/false) directly — no Option wrapping.

verify_pre_extracted_ecdsa

Verify pre-extracted ECDSA (P2PKH/P2PK) inline without re-parsing script_sig.

verify_script

Spec-locked to Orange Paper Section 5.2: VerifyScript

verify_script_with_context

Spec-locked to Orange Paper Section 5.2: VerifyScriptWithContext

verify_script_with_context_full

Spec-locked to Orange Paper Section 5.2: VerifyScriptWithContextFull

Type Aliases

StackElement

Stack element: inline up to 80 bytes when production (sigs, pubkeys, hashes), else Vec.