Migrate to lifted STARK backend by adr1anh · Pull Request #2798 · 0xMiden/miden-vm

adr1anh · 2026-03-06T16:48:02Z

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Repo forked and branch created from next according to naming convention.
Commit messages and codestyle follow conventions.
Commits are signed.
Relevant issues are linked in the PR description.
Tests added for new functionality.
Documentation/comments updated according to changes.
Updated `CHANGELOG.md'

adr1anh

These are mostly notes to myself to be stored either into small patches or issues to be addressed later.

air/src/config/mod.rs

crates/ace-codegen/src/symbolic.rs

crates/ace-codegen/src/tests/basic.rs

miden-vm/tests/integration/prove_verify.rs

processor/src/trace/utils.rs

processor/src/trace/row_major_adapter.rs

air/src/trace/mod.rs

verifier/src/lib.rs

huitseeker

I may have misunderstood something re: public inputs.

air/src/config/mod.rs

air/src/lib.rs

verifier/src/lib.rs

- Migrate ProcessorAir from LiftedAir to MidenAir trait with split impls - Fix program_hash_message and kernel_proc_message to use alpha+beta encoding (was using old multi-alpha pattern causing index out of bounds) - Fix periodic_columns to return actual hasher + bitwise columns - Update ace-codegen builder and tests for new trait signatures - Clean up unused imports across constraint files - Update prove_verify integration tests for new prover API Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

These tests fail with ProgramVerificationError due to a pre-existing issue in the lifted STARK migration, not related to the trait refactor. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Verifier: replace `ProgramVerificationError(Word)` with `StarkVerificationError(Word, Box<config::VerificationError>)` to preserve the inner error instead of discarding it. - Prover: replace `ProofSerializationError(String)` with `ProvingError(Box<config::ProvingError>)` for structured errors. - Move `.map_err()` after the hash function match in both prover and verifier to reduce duplication. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Move enforce_bus_balance after get_responses_at in the trait definition to reflect its role as a debug-only assertion rather than a core method. Add explicit implementations returning true for the 3 bus builders that balance to identity (AuxTraceBuilder, BlockStackColumnBuilder, OpGroupTableColumnBuilder), and reorder the method consistently across all 6 implementors to appear after get_responses_at. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add a public_inputs() method that returns PublicInputs directly, and simplify to_public_values() to delegate to it. Update the prover and integration tests to use trace.public_inputs() instead of manually constructing PublicInputs::new(...). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add TODO comments in prove() and verify() noting that var_len_public_inputs and the ACE commitment should be observed in the Fiat-Shamir transcript. The var-len change also requires updating the recursive verifier. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Replace ace-codegen's custom RecordingAirBuilder and SymExpr/SymVar types with plonky3's upstream SymbolicAirBuilder and SymbolicExpression types. This aligns constraint capture with the canonical representation and removes ~430 lines of duplicated symbolic algebra. Also updates miden-crypto imports for the reorganized module layout (AirBuilder trait changes, hasher/symmetric paths, prover/verifier submodules). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Adapt prove/verify to new API where transcript management is internal to prove_single/verify_single. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Move the trace height validation into `config::verify` (the shared STARK verification entry point) instead of the VM-specific verifier. Reject proofs where `log_trace_height` exceeds the two-adic order of the Goldilocks field (32). Also narrow the parameter type from `usize` to `u32` to match `ExecutionProof::log_trace_height`. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…2550 Replace `debug_assert_eq!` in `kernel_reduced_from_var_len` with a proper runtime check that returns `ReductionError`, preventing panics on malformed input in release builds. Add issue #2550 reference comments near bincode serialize/deserialize calls in `config::prove` and `config::verify`. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Remove the intermediary `row_major_adapter` module from the processor crate. `AuxTraceBuilders` now implements the upstream `AuxBuilder` trait directly, with row-major/column-major conversion inlined using p3's cache-blocked transpose. Add `MainTrace::to_row_major()` for converting back to row-major format. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Move `prove()` and error types from `air::config` into `prover` as `prove_stark()`, de-generified to use concrete `ProcessorAir` and `AuxTraceBuilders` - Move `verify()` and error types from `air::config` into `verifier` as `verify_stark_proof()` - Remove `log_trace_height` from `ExecutionProof`; instead serialize it alongside the STARK proof as a `(u8, StarkProof)` tuple via bincode - Simplify `ExecutionError::ProvingError` to wrap a `String` instead of depending on `miden_air` error types - Remove `bincode` and `serde` dependencies from `air` crate Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ProcessorAir previously stored periodic columns and the kernel procedure count, requiring callers to pass it through prove/verify functions. Since the AIR definition is fully determined at compile time, these fields are unnecessary: - Periodic columns are now generated inline in `periodic_columns()` instead of being cached. - Kernel digests are flattened into a single `Vec<Felt>` slice (via `Word::words_as_elements`) rather than N separate `Word` slices, so `num_var_len_public_inputs()` always returns 1. - `prove_stark` and `verify_stark_proof` no longer take an `air` parameter; they construct `ProcessorAir::default()` internally. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Merge per-hash config modules into a single `air/src/config.rs` with shared type aliases and parameterized factory functions. Update miden-crypto to rev 87e63e6a9 and upgrade Plonky3 to 0.5.0 (crates.io). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Al-Kindi-0

LGTM

adr1anh changed the base branch from next to al-constraints-staging March 6, 2026 16:48

huitseeker mentioned this pull request Mar 6, 2026

Introduce FastProcessor safe stack access methods #2797

Merged

Al-Kindi-0 marked this pull request as ready for review March 7, 2026 12:10

Al-Kindi-0 changed the title ~~Adr1anh/lifted stark v2 fixes~~ Migrate to lifted STARK backend Mar 7, 2026

adr1anh commented Mar 7, 2026

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adr1anh force-pushed the al-constraints-staging branch from 2fb2285 to 838a11c Compare March 9, 2026 14:18

adr1anh force-pushed the adr1anh/lifted-stark-v2-fixes branch from d01099e to c6909bb Compare March 9, 2026 14:18

huitseeker requested changes Mar 9, 2026

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Base automatically changed from al-constraints-staging to tracking-migration-work March 9, 2026 16:16

Al-Kindi-0 mentioned this pull request Mar 10, 2026

Proof size increase after migration to P3 #2515

Open

Al-Kindi-0 mentioned this pull request Mar 10, 2026

Ensure global bus property #2824

Closed

adr1anh and others added 15 commits March 11, 2026 16:37

test: ignore 3 pre-existing prove-verify failures in core-lib

59e87d8

These tests fail with ProgramVerificationError due to a pre-existing issue in the lifted STARK migration, not related to the trait refactor. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

wip: fix bug in trace length and aux values usage

49e8ed2

fix lints

de513ee

update minimal trace length to be 64

2bc4bbf

use arity 4 FRI

6136abf

update dep

436eea2

fix CI issues

060a837

fix rand multi version issue

77487f0

fix: typo in reduced_aux_values comment ("dibling" -> "sibling")

21a187e

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

adr1anh and others added 10 commits March 11, 2026 16:39

chore: update miden-crypto to rev f931d8499

071d62f

Adapt prove/verify to new API where transcript management is internal to prove_single/verify_single. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

chore: link Fiat-Shamir transcript binding issue #2822 in TODOs

0e69154

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

wip: factor out Challenges computation

fef7fad

unify Challenges structs and simplify API

f718ca3

adr1anh force-pushed the adr1anh/lifted-stark-v2-fixes branch from 2393234 to 5507b88 Compare March 11, 2026 16:09

Al-Kindi-0 approved these changes Mar 11, 2026

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Al-Kindi-0 requested review from bobbinth, huitseeker and plafer March 11, 2026 16:36

chore: fix air/config docs

1a92150

adr1anh merged commit fc8ffbf into tracking-migration-work Mar 11, 2026
13 checks passed

adr1anh deleted the adr1anh/lifted-stark-v2-fixes branch March 11, 2026 17:10

Al-Kindi-0 mentioned this pull request Mar 11, 2026

Tracking migration work for lifted STARK 0xMiden/crypto#881

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Migrate to lifted STARK backend#2798

Migrate to lifted STARK backend#2798
adr1anh merged 26 commits intotracking-migration-workfrom
adr1anh/lifted-stark-v2-fixes

adr1anh commented Mar 6, 2026

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adr1anh commented Mar 6, 2026

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