feat: Use poseidon for structs hashing

[sirasistant]

Use poseidon2 instead of pedersen for hashing structs in the protocol

[github-actions]

Changes to circuit sizes

Generated at commit: ae9cfddd41ea9f89c5f93223236f2ab3d9a78592, compared to commit: 832b86e65f84e00c3ea9892df4b7c3eeb7eaf5ea

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	+32 ❌	+0.01%	-1,399 ✅	-0.04%
rollup_root	+38 ❌	+0.88%	-1,242 ✅	-0.04%
public_kernel_teardown	+1 ❌	+0.00%	-7,807 ✅	-0.46%
public_kernel_setup	+1 ❌	+0.00%	-7,807 ✅	-0.49%
public_kernel_tail	+1 ❌	+0.00%	-37,109 ✅	-0.76%
public_kernel_app_logic	+1 ❌	+0.00%	-7,813 ✅	-1.25%
private_kernel_inner	+6 ❌	+0.01%	-2,617 ✅	-3.74%
private_kernel_reset_tiny	+1 ❌	+0.00%	-5,985 ✅	-4.94%
private_kernel_reset_small	+1 ❌	+0.00%	-11,849 ✅	-6.97%
private_kernel_reset_medium	+1 ❌	+0.00%	-23,577 ✅	-8.81%
private_kernel_reset_big	+1 ❌	+0.00%	-47,033 ✅	-10.15%
private_kernel_reset	+1 ❌	+0.00%	-93,945 ✅	-10.99%
private_kernel_init	+24 ❌	+0.08%	-8,024 ✅	-16.98%
private_kernel_tail	+6 ❌	+0.03%	-188,458 ✅	-34.93%
private_kernel_tail_to_public	+6 ❌	+0.01%	-188,458 ✅	-40.97%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	341,470 (+32)	+0.01%	3,836,394 (-1,399)	-0.04%
rollup_root	4,336 (+38)	+0.88%	3,147,991 (-1,242)	-0.04%
public_kernel_teardown	295,878 (+1)	+0.00%	1,680,007 (-7,807)	-0.46%
public_kernel_setup	216,955 (+1)	+0.00%	1,599,449 (-7,807)	-0.49%
public_kernel_tail	1,001,454 (+1)	+0.00%	4,848,907 (-37,109)	-0.76%
public_kernel_app_logic	294,268 (+1)	+0.00%	619,121 (-7,813)	-1.25%
private_kernel_inner	50,018 (+6)	+0.01%	67,308 (-2,617)	-3.74%
private_kernel_reset_tiny	57,745 (+1)	+0.00%	115,195 (-5,985)	-4.94%
private_kernel_reset_small	61,157 (+1)	+0.00%	158,125 (-11,849)	-6.97%
private_kernel_reset_medium	67,984 (+1)	+0.00%	244,164 (-23,577)	-8.81%
private_kernel_reset_big	81,637 (+1)	+0.00%	416,449 (-47,033)	-10.15%
private_kernel_reset	108,941 (+1)	+0.00%	761,017 (-93,945)	-10.99%
private_kernel_init	28,620 (+24)	+0.08%	39,241 (-8,024)	-16.98%
private_kernel_tail	20,709 (+6)	+0.03%	351,016 (-188,458)	-34.93%
private_kernel_tail_to_public	76,161 (+6)	+0.01%	271,516 (-188,458)	-40.97%

[AztecBot]

Benchmark results

Metrics with a significant change:

• proof_construction_time_sha256_100_ms (16): 7,080 (+23%)
• app_circuit_input_size_in_bytes (Token:transfer_public (avm)): 61,614 (+31%)
• app_circuit_input_size_in_bytes (AuthRegistry:consume (avm)): 41,719 (+56%)
• protocol_circuit_simulation_time_in_ms (private-kernel-tail-to-public): 3,374 (-25%)
• avm_simulation_time_ms (Token:mint_public): 89.3 (+57%)
• avm_simulation_time_ms (FPC:pay_refund): 64.8 (-32%)
• avm_simulation_bytecode_size_in_bytes (Token:constructor): 31,107 (+90%)
• avm_simulation_bytecode_size_in_bytes (FPC:constructor): 24,011 (+158%)
• avm_simulation_bytecode_size_in_bytes (Token:transfer_public): 47,374 (+45%)
• protocol_circuit_proving_time_in_ms (base-parity): 2,066 (+51%)
• app_circuit_proving_time_in_ms (AuthRegistry:consume (avm)): 8,093 (+70%)

Detailed results

All benchmarks are run on txs on the Benchmarking contract on the repository. Each tx consists of a batch call to create_note and increment_balance, which guarantees that each tx has a private call, a nested private call, a public call, and a nested public call, as well as an emitted private note, an unencrypted log, and public storage read and write.

This benchmark source data is available in JSON format on S3 here.

Proof generation

Each column represents the number of threads used in proof generation.

Metric	1 threads	4 threads	16 threads	32 threads	64 threads
proof_construction_time_sha256_ms	5,736 (-1%)	1,537 (-2%)	707	733 (-4%)	761 (-1%)
proof_construction_time_sha256_30_ms	11,748 (-1%)	3,175 (-1%)	1,418	1,426 (-2%)	1,469
proof_construction_time_sha256_100_ms	44,004 (-1%)	12,591	⚠️ 7,080 (+23%)	5,721 (+2%)	5,565
proof_construction_time_poseidon_hash_ms	78.0 (-1%)	34.0	34.0	59.0 (+4%)	88.0 (+2%)
proof_construction_time_poseidon_hash_30_ms	1,515 (-1%)	417 (-1%)	200	222 (-6%)	267
proof_construction_time_poseidon_hash_100_ms	5,611 (-1%)	1,516 (-1%)	677	722 (+1%)	753

L2 block published to L1

Each column represents the number of txs on an L2 block published to L1.

Metric	4 txs	8 txs	16 txs
l1_rollup_calldata_size_in_bytes	740	740	740
l1_rollup_calldata_gas	6,716	6,728	6,728
l1_rollup_execution_gas	611,983	612,146	612,297
l2_block_processing_time_in_ms	754	1,413 (-3%)	2,653
l2_block_building_time_in_ms	10,369 (-3%)	20,090 (-4%)	40,089 (-5%)
l2_block_rollup_simulation_time_in_ms	10,369 (-3%)	20,090 (-4%)	40,088 (-5%)
l2_block_public_tx_process_time_in_ms	8,625 (-3%)	18,171 (-4%)	38,068 (-6%)

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 8 txs.

Metric	3 blocks	5 blocks
node_history_sync_time_in_ms	6,984 (-12%)	9,880 (+1%)
node_database_size_in_bytes	12,779,600 (+1%)	16,937,040 (+1%)
pxe_database_size_in_bytes	16,254	26,813

Circuits stats

Stats on running time and I/O sizes collected for every kernel circuit run across all benchmarks.

Circuit	simulation_time_in_ms	witness_generation_time_in_ms	input_size_in_bytes	output_size_in_bytes	proving_time_in_ms	proof_size_in_bytes	num_public_inputs	size_in_gates
private-kernel-init	107 (-9%)	391 (-2%)	21,845	44,858	N/A	N/A	N/A	N/A
private-kernel-inner	173 (-5%)	681 (-1%)	72,544	45,005	N/A	N/A	N/A	N/A
private-kernel-tail	685 (-9%)	819 (-10%)	53,523 (+1%)	49,801	N/A	N/A	N/A	N/A
base-parity	6.63 (+4%)	653 (+5%)	160	96.0	⚠️ 2,066 (+51%)	13,188	19.0	131,072
root-parity	113 (+2%)	124 (+1%)	69,084	96.0	31,840 (+2%)	13,188	19.0	4,194,304
base-rollup	3,297 (-3%)	4,983 (+3%)	182,288	664	44,944 (+1%)	14,020	45.0	4,194,304
root-rollup	150 (-4%)	127 (+5%)	54,525	716	29,271 (+3%)	13,988	44.0	4,194,304
public-kernel-setup	91.1	2,776 (+1%)	102,617	69,814	17,850 (-3%)	127,172	3,581	2,097,152
public-kernel-app-logic	105 (-3%)	4,100 (+3%)	102,617	69,814	10,928 (-2%)	127,172	3,581	1,048,576
public-kernel-tail	632 (-2%)	27,078 (-6%)	402,342	10,878	67,648	26,436	433	8,388,608
private-kernel-reset-tiny	227 (-7%)	907 (+3%)	68,578	44,750	N/A	N/A	N/A	N/A
private-kernel-tail-to-public	⚠️ 3,374 (-25%)	1,524 (-5%)	977,330 (+5%)	1,697	N/A	N/A	N/A	N/A
public-kernel-teardown	86.2 (-2%)	4,127 (+2%)	102,617	69,814	18,643 (-2%)	127,172	3,581	2,097,152
merge-rollup	60.7 (-1%)	N/A	35,742	664	N/A	N/A	N/A	N/A
undefined	N/A	N/A	N/A	N/A	159,032 (+1%)	N/A	N/A	N/A

Stats on running time collected for app circuits

Function	input_size_in_bytes	output_size_in_bytes	witness_generation_time_in_ms	proof_size_in_bytes	proving_time_in_ms
ContractClassRegisterer:register	1,344	11,731	344 (+1%)	N/A	N/A
ContractInstanceDeployer:deploy	1,408	11,731	18.1 (-18%)	N/A	N/A
MultiCallEntrypoint:entrypoint	1,920	11,731	575 (-4%)	N/A	N/A
GasToken:deploy	1,376	11,731	401 (+5%)	N/A	N/A
SchnorrAccount:constructor	1,312	11,731	405 (-4%)	N/A	N/A
SchnorrAccount:entrypoint	2,304	11,731	765 (-5%)	N/A	N/A
Token:privately_mint_private_note	1,280	11,731	474 (-4%)	N/A	N/A
FPC:fee_entrypoint_public	1,344	11,731	61.6 (-2%)	N/A	N/A
Token:transfer	1,312	11,731	1,219 (-2%)	N/A	N/A
AuthRegistry:set_authorized (avm)	18,491	N/A	N/A	147,456	2,615
FPC:prepare_fee (avm)	22,958	N/A	N/A	147,520	3,390 (+3%)
Token:transfer_public (avm)	⚠️ 61,614 (+31%)	N/A	N/A	147,520	20,380 (+13%)
AuthRegistry:consume (avm)	⚠️ 41,719 (+56%)	N/A	N/A	147,488	⚠️ 8,093 (+70%)
FPC:pay_refund (avm)	26,227	N/A	N/A	147,488	7,879 (+1%)
Benchmarking:create_note	1,344	11,731	395 (-7%)	N/A	N/A
SchnorrAccount:verify_private_authwit	1,280	11,731	28.2 (-11%)	N/A	N/A
Token:unshield	1,376	11,731	1,049 (+1%)	N/A	N/A
FPC:fee_entrypoint_private	1,376	11,731	1,336 (+1%)	N/A	N/A

AVM Simulation

Time to simulate various public functions in the AVM.

Function	time_ms	bytecode_size_in_bytes
GasToken:_increase_public_balance	95.6 (+1%)	8,139
GasToken:set_portal	11.7 (-11%)	2,362
Token:constructor	123 (+4%)	⚠️ 31,107 (+90%)
FPC:constructor	96.6 (+6%)	⚠️ 24,011 (+158%)
GasToken:mint_public	80.2	6,150
Token:mint_public	⚠️ 89.3 (+57%)	11,720
Token:assert_minter_and_mint	55.3 (+1%)	8,028
AuthRegistry:set_authorized	46.2 (+8%)	4,537
FPC:prepare_fee	249 (+5%)	8,812
Token:transfer_public	45.6 (-3%)	⚠️ 47,374 (+45%)
FPC:pay_refund	⚠️ 64.8 (-32%)	12,114
Benchmarking:increment_balance	1,012 (-2%)	7,450
Token:_increase_public_balance	10.1 (-15%)	8,960
FPC:pay_refund_with_shielded_rebate	146 (+6%)	12,663

Public DB Access

Time to access various public DBs.

Function	time_ms
get-nullifier-index	0.158 (+5%)

Tree insertion stats

The duration to insert a fixed batch of leaves into each tree type.

Metric	1 leaves	16 leaves	64 leaves	128 leaves	256 leaves	512 leaves	1024 leaves
batch_insert_into_append_only_tree_16_depth_ms	10.3 (-1%)	16.5 (-1%)	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.7	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.594 (-1%)	0.508 (-1%)	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	47.7	74.4 (-2%)	129 (-1%)	246 (-6%)	462
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	95.9	159	287	543	1,055
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.487	0.457 (-2%)	0.444	0.445 (-6%)	0.431
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	59.1	110 (-9%)	181 (+1%)	348 (-6%)	681
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	109	207	355	691	1,363
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.498	0.493 (-9%)	0.479 (+1%)	0.471 (-6%)	0.468
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	71.8 (-1%)	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	133	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	0.511 (-1%)	N/A	N/A	N/A	N/A

Miscellaneous

Transaction sizes based on how many contract classes are registered in the tx.

Metric	0 registered classes	1 registered classes
tx_size_in_bytes	62,729	664,455

Transaction size based on fee payment method

| Metric | |
| - | |

[LeilaWang]

Let's go~~~ 🚀