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feat: Use full IPA recursive verifier in root rollup #10962

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@lucasxia01 lucasxia01 commented Dec 24, 2024

Modifies the root rollup circuit to use different recursion proof type, ROOT_ROLLUP_HONK and processing of honk_recursion_constraints, so the backend knows to run the full IPA recursive verifier.

Resolves AztecProtocol/barretenberg#1183.

@lucasxia01 lucasxia01 self-assigned this Dec 24, 2024
@@ -270,9 +273,8 @@ void build_constraints(Builder& builder, AcirProgram& program, const ProgramMeta
// final recursion output.
builder.add_pairing_point_accumulator(current_aggregation_object);
}
// TODO(https://github.com/AztecProtocol/barretenberg/issues/1183): This assertion should be true, except for
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honk_recursion is 2 for the tube, base, merge, block root, block merge circuits, but NOT the root rollup.

This assert previously wasn't true because the root rollup wasn't running the full verifier and therefore still spit out an ipa claim and proof, but now that it does run full verification, it will output nothing.

@@ -379,13 +381,17 @@ HonkRecursionConstraintsOutput<Builder> process_honk_recursion_constraints(
size_t idx = 0;
std::vector<OpeningClaim<stdlib::grumpkin<Builder>>> nested_ipa_claims;
std::vector<StdlibProof<Builder>> nested_ipa_proofs;
bool is_root_rollup = false;
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this bool checks to see if any of the honk recursion constraints set the proof type to be ROOT ROLLUP HONK and that's how we know whether to run the full IPA recursive verifier or not.

@@ -400,6 +406,7 @@ HonkRecursionConstraintsOutput<Builder> process_honk_recursion_constraints(
gate_counter.track_diff(constraint_system.gates_per_opcode,
constraint_system.original_opcode_indices.honk_recursion_constraints.at(idx++));
}
ASSERT(!(is_root_rollup && nested_ipa_claims.size() != 2) && "Root rollup must accumulate two IPA proofs.");
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just checking to make sure that if its the root rollup, we have 2 nested IPA claims to accumulate

// do full IPA verification
auto accumulated_ipa_transcript =
std::make_shared<StdlibTranscript>(convert_native_proof_to_stdlib(&builder, ipa_proof));
IPA<stdlib::grumpkin<Builder>>::full_verify_recursive(
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if root rollup, run full IPA recursive verifier, otherwise return the ipa claim and proof as output

@@ -635,7 +635,7 @@ void handle_blackbox_func_call(Program::Opcode::BlackBoxFuncCall const& arg,
// be the only means for setting the proof type. use of honk_recursion flag in this context can go
// away once all noir programs (e.g. protocol circuits) are updated to use the new pattern.
if (proof_type_in != HONK && proof_type_in != AVM && proof_type_in != ROLLUP_HONK &&
proof_type_in != ROLLUP_ROOT_HONK) {
proof_type_in != ROOT_ROLLUP_HONK) {
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just a renaming

impl Verifiable for PreviousRollupBlockData {
fn verify(self) {
impl PreviousRollupBlockData {
fn verify(self, proof_type_id: u32) {
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adding an extra argument because this function is shared between the root rollup and the block merge

self.previous_rollup_data[0].validate_in_vk_tree(ALLOWED_PREVIOUS_CIRCUITS);

self.previous_rollup_data[1].verify();
self.previous_rollup_data[1].verify(PROOF_TYPE_ROOT_ROLLUP_HONK);
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core change: this is the ROOT_ROLLUP_HONK type

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LGTM

@lucasxia01 lucasxia01 enabled auto-merge (squash) December 24, 2024 22:50
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Use Rollup Root proof type for root rollup circuit
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