feat: Inject fee payment update in base rollup

[spalladino]

Implements the fee payment update spec by charging the user's fee in the base rollup circuit. Involves the following changes:

• Transactions now have a set of protocol-public-data-writes, which are data writes triggered by the protocol and not the user. We populate this in the base rollup circuit to charge the fee_payer. Note that if no fee_payer is sent, the tx goes through without paying (this will change once we enforce fees).
• The base rollup circuit now needs a public data read hint to be able to read the fee_payer's current balance.
• The GasToken contract now has no pay_fee function anymore. The pay_fee functions in the FPC are now renamed to pay_refund
• The GasToken address is now a constant, since the base rollup circuit needs to know it to derive the slot for users balances. Because of this, the portal_address is removed from the GasToken constructor, so the address of the GasToken does not depend on its L1 counterpart, which would have made deployments more cumbersome.
• Added an ACVM_FORCE_WASM flag to tests to force using acvm wasm instead of binary, since the binary failed to report the assertion failed messages.
• The sequencer now validates that the fee_payer (if set) has enough balance to pay for the tx before picking it up, assuming it consumes all its gas limits.

Coming up on future PRs:

• Reenable the native fee payment method and set up a non-bench test for it
• Handle fee payments and gas token claims on the same tx ([fees] Consume gas token bridged on the same tx #6562)

[github-actions]

Changes to circuit sizes

Generated at commit: 8cccc4cb2d63e0c9587adedb40a5bf7f1cc28c7e, compared to commit: d3c3d4a565568329ca55f24e7f5e8d3e293e1366

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	+9,914 ❌	+5.47%	+29,611 ❌	+1.67%
private_kernel_tail	-2 ✅	-0.00%	-4 ✅	-0.00%
private_kernel_tail_to_public	-4 ✅	-0.00%	-8 ✅	-0.00%
public_kernel_teardown	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_setup	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_app_logic	-200 ✅	-0.08%	-360 ✅	-0.05%
private_kernel_tail_to_public_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_app_logic_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_setup_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_teardown_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_tail	-2,126 ✅	-0.21%	-4,928 ✅	-0.13%
private_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%
public_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	191,041 (+9,914)	+5.47%	1,806,511 (+29,611)	+1.67%
private_kernel_tail	195,031 (-2)	-0.00%	1,316,885 (-4)	-0.00%
private_kernel_tail_to_public	621,552 (-4)	-0.00%	2,147,286 (-8)	-0.00%
public_kernel_teardown	223,363 (-160)	-0.07%	667,581 (-300)	-0.04%
public_kernel_setup	223,157 (-160)	-0.07%	667,288 (-300)	-0.04%
public_kernel_app_logic	251,697 (-200)	-0.08%	796,596 (-360)	-0.05%
private_kernel_tail_to_public_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_app_logic_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_setup_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_teardown_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_tail	1,027,305 (-2,126)	-0.21%	3,704,913 (-4,928)	-0.13%
private_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%
public_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%

[AztecBot]

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[spalladino]

@LeilaWang do you know if this is a missing check or it's indeed not needed?

[LeilaWang]

It doesn't necessary have to be sorted in increasing order. But the values need to be arranged in a way that the low leaf will be inserted before a value if both are pending. It's on the prover to decide how to create the array, as long as it's a permutation of values_to_insert, which is checked above.

[LeilaWang]

We probably need better names cause I was confused for a bit 😂

[spalladino]

Makes sense, thanks! I'll remove this comment on the next PR.

[LeilaWang]

LGTM! 🚀

[just-mitch]

Nice!

[spalladino]

• feat: Claim and pay fee on the same tx #6579
• feat: Reenable native fee payment #6571
• feat: Inject fee payment update in base rollup #6403 👈
• master

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[AztecBot]

Benchmark results

No base data found for comparison.

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	5,681	1,543	715	749	777

L2 block published to L1

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

Metric	8 txs	32 txs	64 txs
l1_rollup_calldata_size_in_bytes	772	772	772
l1_rollup_calldata_gas	6,868	6,880	6,880
l1_rollup_execution_gas	587,408	587,420	587,420
l2_block_processing_time_in_ms	1,355	5,101	10,130
l2_block_building_time_in_ms	32,315	127,003	253,779
l2_block_rollup_simulation_time_in_ms	32,142	126,371	252,530
l2_block_public_tx_process_time_in_ms	16,838	69,146	141,952

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 16 txs.

Metric	5 blocks	10 blocks
node_history_sync_time_in_ms	15,100	28,226
node_database_size_in_bytes	21,221,456	37,896,272
pxe_database_size_in_bytes	29,868	12,535

Circuits stats

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

Circuit	protocol_circuit_simulation_time_in_ms	protocol_circuit_witness_generation_time_in_ms	protocol_circuit_proving_time_in_ms	protocol_circuit_input_size_in_bytes	protocol_circuit_output_size_in_bytes	protocol_circuit_proof_size_in_bytes	protocol_circuit_num_public_inputs	protocol_circuit_size_in_gates
private-kernel-init	158	3,686	21,825	19,985	61,999	86,720	2,643	1,048,576
private-kernel-inner	602	4,784	41,001	89,053	61,999	86,720	2,643	2,097,152
private-kernel-reset-small	571	2,386	23,098	117,961	61,999	86,720	2,643	1,048,576
private-kernel-tail	526	3,905	37,750	86,849	78,838	10,624	265	2,097,152
base-parity	6.53	1,043	3,164	128	64.0	2,208	2.00	131,072
root-parity	49.2	62.2	40,377	27,064	64.0	2,720	18.0	2,097,152
base-rollup	720	2,553	43,775	112,602	957	3,136	31.0	2,097,152
root-rollup	93.2	48.8	8,357	11,518	821	3,456	41.0	524,288
public-kernel-app-logic	241	135	745	96,850	84,967	116,320	3,568	4,096
public-kernel-tail	861	668	1,160	388,084	7,691	10,112	249	512
public-kernel-setup	218	220	918	143,141	84,967	116,320	3,568	4,096
public-kernel-teardown	224	239	1,151	143,141	84,967	116,320	3,568	4,096
merge-rollup	6.45	19.8	1,615	2,760	957	3,136	31.0	65,536
private-kernel-tail-to-public	N/A	9,744	72,039	N/A	N/A	116,832	3,584	4,194,304

Stats on running time collected for app circuits

Function	app_circuit_proof_size_in_bytes	app_circuit_proving_time_in_ms	app_circuit_size_in_gates	app_circuit_num_public_inputs
SchnorrAccount:entrypoint	16,128	47,755	2,097,152	437
Test:emit_nullifier	16,128	2,786	65,536	437
FPC:fee_entrypoint_public	16,128	16,708	524,288	437
FPC:fee_entrypoint_private	16,128	9,005	524,288	437
Token:unshield	16,128	48,097	2,097,152	437
SchnorrAccount:spend_private_authwit	16,128	2,690	131,072	437
Token:transfer	16,128	35,047	2,097,152	437

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	512 leaves	1024 leaves	2048 leaves	4096 leaves	32 leaves
batch_insert_into_append_only_tree_16_depth_ms	11.2	18.2	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.7	31.8	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.654	0.561	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	52.2	80.5	261	502	989	1,960	N/A
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	95.9	159	543	1,055	2,079	4,127	N/A
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.534	0.497	0.475	0.469	0.469	0.468	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	62.4	119	378	737	1,474	2,932	N/A
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	106	208	692	1,363	2,707	5,395	N/A
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.543	0.534	0.511	0.507	0.510	0.509	N/A
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	67.4
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	108
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0.591

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	84,613	664,966

Transaction size based on fee payment method

| Metric | |
| - | |

Transaction processing duration by data writes.

Metric	0 new note hashes	1 new note hashes	2 new note hashes
tx_pxe_processing_time_ms	27,546	4,239	122,868

Metric	0 public data writes	1 public data writes	2 public data writes	3 public data writes	4 public data writes	8 public data writes
tx_sequencer_processing_time_ms	1,370	2,205	1,509	4,068	1,691	1,989