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fix(core): bump WITNESS_OVERHEAD_BYTES from 128 to 256

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128 underbid by ~144 bytes on a 3-input plutus_mint with inline V2
policy CBOR (preprod_test2 governor bootstrap 2026-05-08, hit
FeeTooSmallUTxO 6353 lovelace short). The original constant covered
the vkey witness alone but missed redeemer ex_units final-pass
inflation + CBOR length-prefix shifts between unsigned (def-length)
and signed (often indef-length) witness-set arrays.

256 is plenty for any single-vkey case and still cheap fee-wise
(56-lovelace difference at the Cardano per-byte rate). For multi-sig
flows we'd revisit, but plutus_mint's only signer is the wallet's
own payment key.
This commit is contained in:
Kayos 2026-05-08 07:12:04 -07:00
parent 5235a5d4c3
commit 4472007dae
1 changed files with 7 additions and 1 deletions
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8
crates/aldabra-core/src/plutus_mint.rs
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@ -191,7 +191,13 @@ fn hash_to_hex_32(h: &[u8; 32]) -> String {
s
}
const WITNESS_OVERHEAD_BYTES: u64 = 128;
// Generous overhead for the vkey witness + redeemer ex_units inflation +
// CBOR length-prefix flips between unsigned (def-length) and signed
// (indef-length) array tags. Original 128 underbid by ~144 bytes on a
// 3-input + inline-V2-policy mint (preprod_test2 governor bootstrap
// 2026-05-08, FeeTooSmallUTxO @ 6353 lovelace short). 256 is plenty
// for any single-vkey signing case.
const WITNESS_OVERHEAD_BYTES: u64 = 256;
/// Build + sign a Plutus-policy mint with a fully-specified output.
///