Deposit value fix #1969

ch1bo · 2025-04-26T21:13:03Z

This makes sure that the deposited value as claimed in the datum is actually available at the deposit script output to be incremented.

Related to this paragraph in the specification:

CHANGELOG updated or not needed
Documentation updated or not needed
Haddocks updated
No new TODOs introduced

github-actions · 2025-04-26T21:23:25Z

Transaction cost differences

No cost or size differences found

github-actions · 2025-04-26T21:24:49Z

Transaction costs

Sizes and execution budgets for Hydra protocol transactions. Note that unlisted parameters are currently using arbitrary values and results are not fully deterministic and comparable to previous runs.

Metadata
Generated at	2025-05-15 06:36:02.144858194 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	c8a101a5c8ac4816b0dceb59ce31fc2258e387de828f02961d2f2045	2652
νCommit	61458bc2f297fff3cc5df6ac7ab57cefd87763b0b7bd722146a1035c	685
νHead	be6ebc744208c660bf0fdc1cfbb5157477cd305de5b1777e575cbb4c	14665
μHead	1f47a42d1d6edc32ccd834acb19d5db3b2a5232f0bd7eaa8908dc519*	5284
νDeposit	ae01dade3a9c346d5c93ae3ce339412b90a0b8f83f94ec6baa24e30c	1102

The minting policy hash is only usable for comparison. As the script is parameterized, the actual script is unique per head.

`Init` transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	5836	10.44	3.31	0.52
2	6035	12.20	3.85	0.54
3	6236	14.68	4.64	0.58
5	6640	18.38	5.79	0.63
10	7646	29.09	9.17	0.79
43	14279	98.73	30.85	1.80

`Commit` transaction costs

This uses ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	561	2.44	1.16	0.20
2	740	3.38	1.73	0.22
3	923	4.36	2.33	0.24
5	1279	6.41	3.60	0.28
10	2174	12.13	7.25	0.40
54	10056	98.61	68.52	1.88

`CollectCom` transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	525	24.43	7.12	0.42
2	114	636	32.20	9.36	0.51
3	171	747	41.40	11.95	0.60
4	226	858	48.20	13.99	0.68
5	283	969	55.92	16.29	0.76
6	341	1081	66.15	19.14	0.87
7	393	1192	72.52	21.03	0.94
8	450	1303	90.33	25.80	1.12
9	505	1414	99.42	28.45	1.22

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1811	23.87	7.97	0.48
2	1981	26.43	9.50	0.52
3	2072	26.77	10.22	0.53
5	2479	33.24	13.75	0.63
10	3217	42.19	20.08	0.78
43	7914	99.94	60.61	1.74

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	602	22.73	7.33	0.41
2	749	24.28	8.43	0.44
3	866	24.98	9.27	0.46
5	1227	31.22	12.35	0.55
10	1954	38.50	17.72	0.68
42	6572	96.35	55.14	1.62

`Close` transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	598	28.33	8.94	0.47
2	841	29.11	10.02	0.49
3	914	32.54	11.67	0.54
5	1231	36.69	14.39	0.60
10	1985	47.19	21.15	0.77
36	6141	98.88	55.90	1.62

`Contest` transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	702	33.70	10.51	0.53
2	864	36.36	12.08	0.57
3	900	37.10	12.76	0.58
5	1314	42.87	16.17	0.67
10	2004	52.95	22.58	0.83
29	5045	99.37	50.40	1.54

`Abort` transaction costs

There is some variation due to the random mixture of initial and already committed outputs.

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	5754	26.89	9.01	0.69
2	5912	36.78	12.35	0.80
3	6021	45.37	15.24	0.89
4	5985	49.16	16.36	0.93
5	6323	65.95	22.21	1.12
6	6415	71.41	24.01	1.18
7	6475	79.85	26.70	1.27
8	6630	89.52	30.09	1.38
9	6769	99.48	33.41	1.49

`FanOut` transaction costs

Involves spending head output and burning head tokens. Uses ada-only UTXO for better comparability.

Parties	UTxO	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
10	1	57	5869	21.67	7.37	0.64
10	20	1136	6510	60.46	22.69	1.09
10	30	1707	6853	79.20	30.17	1.31
10	40	2278	7194	99.72	38.25	1.55

End-to-end benchmark results

This page is intended to collect the latest end-to-end benchmark results produced by Hydra's continuous integration (CI) system from the latest master code.

Please note that these results are approximate as they are currently produced from limited cloud VMs and not controlled hardware. Rather than focusing on the absolute results, the emphasis should be on relative results, such as how the timings for a scenario evolve as the code changes.

Generated at 2025-05-15 06:39:36.830006724 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	4.390839993
P99	5.824176459999995ms
P95	5.142898000000001ms
P50	4.2591245ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-05-15 06:38:14.901501146 UTC	770M	6927M
2025-05-15 06:38:19.901483168 UTC	865M	6789M
2025-05-15 06:38:24.901369414 UTC	871M	6783M
2025-05-15 06:38:29.9014035 UTC	873M	6780M
2025-05-15 06:38:34.901397707 UTC	875M	6779M
2025-05-15 06:38:39.901385394 UTC	875M	6778M

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	34.376261433
P99	59.162663559999984ms
P95	51.68715844999999ms
P50	32.211393ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-05-15 06:38:53.717296684 UTC	791M	6897M
2025-05-15 06:38:58.717368974 UTC	1009M	6600M
2025-05-15 06:39:03.717932036 UTC	1069M	6490M
2025-05-15 06:39:08.717958744 UTC	1091M	6413M
2025-05-15 06:39:13.717338732 UTC	1090M	6405M
2025-05-15 06:39:18.717291264 UTC	1091M	6404M
2025-05-15 06:39:23.717349791 UTC	1094M	6400M
2025-05-15 06:39:28.717336811 UTC	1096M	6398M
2025-05-15 06:39:33.717271229 UTC	1096M	6397M

hydra-tx/test/Hydra/Tx/Contract/Deposit.hs

hydra-tx/test/Hydra/Tx/Contract/Increment.hs

ch1bo · 2025-04-29T07:21:16Z

Tested and fixed generators now to get this passing consistently. Probably worth a re-review

noonio · 2025-04-30T08:44:13Z

hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs

@@ -14,6 +14,13 @@ import PlutusLedgerApi.V3 qualified as Plutus

 -- * Extras

+-- | Check whether left contains right.
+containsValue :: Value -> Value -> Bool


This function is probably worth a property test or so. At an immediate glance I can't tell if it's correct; so would be nice to check :)

Can you state me a property you would like to see here; in english is fine? (I struggled without repeating the implementation)

a < b => containsValue b a && not containsValue b a ?

or maybe

one where each individual value is smaller than the requested, but the sum is greater? (does Value work that way?)

basically:

what if you forgot to call negateValue ?

what if you forgot to write positive ?

what if instead of all you wrote any ?

hydra-tx/src/Hydra/Tx/Deposit.hs

noonio · 2025-05-01T06:26:35Z

hydra-tx/test/Hydra/Tx/Contract/Deposit.hs

+          testNetworkId
+          (mkHeadId testPolicyId)
+          CommitBlueprintTx{blueprintTx = txSpendingUTxO healthyDepositUTxO, lookupUTxO = healthyDepositUTxO}
+          depositDeadline -- TODO: should generate


Any reason to not resolve this todo now? Seems like it should be easy now it's the Num?

It's not a Num in this PR, but can resolve this, yes.

hydra-tx/testlib/Test/Hydra/Tx/Gen.hs

noonio

Lovely.

I wonder if it's worth being a bit more explicit with the tests that we write to capture potential attacks; just so we know to be extra extra mindful of those if they fail? I.e. group or tag them in some way?

ch1bo · 2025-05-01T09:12:03Z

Lovely.

I wonder if it's worth being a bit more explicit with the tests that we write to capture potential attacks; just so we know to be extra extra mindful of those if they fail? I.e. group or tag them in some way?

Aren't you mindful on each failing test? :)

noonio · 2025-05-01T10:48:18Z

Aren't you mindful on each failing test? :)

😂

hydra-tx/testlib/Test/Hydra/Tx/Gen.hs

Any change to the deposit output value without also updating the recorded commit in the datum should invalidate the deposit observation.

This makes sure that the deposited value as claimed in the datum is actually available at the deposit script output to be incremented.

This makes sure we test a wider range of transactions and we can easily switch to this approach for deposits as the mutations are fully defined on the mutated tx/utxo.

The ada in values generated by cardano-ledger is often using maxBound of Word64 and this goes quickly out of bounds when summed up. This changes genTxOut to only produce realistic ada values (<< max supply).

generateWith uses size 30 and this is too big of utxo to deposit.

Also ensures the minimum lovelace in an output using default pparams.

github-project-automation bot added this to ☕ Hydra Team Work Apr 26, 2025

github-project-automation bot moved this to Triage 🏥 in ☕ Hydra Team Work Apr 26, 2025

ch1bo requested a review from a team April 26, 2025 21:13

ch1bo self-assigned this Apr 26, 2025

ch1bo force-pushed the deposit-value-fix branch from 4dc17a4 to d1e24e3 Compare April 26, 2025 21:17

ch1bo force-pushed the deposit-value-fix branch from 1719628 to 14f66be Compare April 26, 2025 22:36

ch1bo commented Apr 26, 2025

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ch1bo force-pushed the deposit-value-fix branch from 14f66be to debbf91 Compare April 27, 2025 18:05

ch1bo moved this from Triage 🏥 to In review 👀 in ☕ Hydra Team Work Apr 27, 2025

v0d1ch approved these changes Apr 28, 2025

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ch1bo force-pushed the deposit-value-fix branch from debbf91 to 538d3d1 Compare April 28, 2025 19:07

ch1bo commented Apr 28, 2025

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ch1bo requested review from v0d1ch and a team April 29, 2025 07:21

ch1bo force-pushed the deposit-value-fix branch from 434db29 to b5e188b Compare April 29, 2025 08:57

ch1bo mentioned this pull request Apr 29, 2025

Fix deposit observation of deadlines that are too soon #1974

Merged

4 tasks

ch1bo enabled auto-merge April 29, 2025 10:02

ch1bo disabled auto-merge April 29, 2025 10:02

ch1bo added the stacked Stacked diff. Review it, but leave merging to the author. label Apr 29, 2025

noonio reviewed Apr 30, 2025

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ch1bo mentioned this pull request Apr 30, 2025

Fix observation of deposits to be settled #1978

Open

6 tasks

ch1bo linked an issue Apr 30, 2025 that may be closed by this pull request

Check deposit deadline before incrementing #1951

Closed

noonio reviewed May 1, 2025

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ch1bo force-pushed the deposit-value-fix branch 10 times, most recently from eebbf1a to 63029ec Compare May 14, 2025 07:23

ch1bo added 9 commits May 15, 2025 08:08

Write a mutation test for deposit observation

dd6873f

Any change to the deposit output value without also updating the recorded commit in the datum should invalidate the deposit observation.

Check deposit value on observation

1f88d4e

This makes sure that the deposited value as claimed in the datum is actually available at the deposit script output to be incremented.

Update a few haddocks on utxo generators

cc9d56b

Generate healthy deposit transactions

95c5d1a

This makes sure we test a wider range of transactions and we can easily switch to this approach for deposits as the mutations are fully defined on the mutated tx/utxo.

Define genUTxO in terms of genTxOut and bound ada

448b3a8

The ada in values generated by cardano-ledger is often using maxBound of Word64 and this goes quickly out of bounds when summed up. This changes genTxOut to only produce realistic ada values (<< max supply).

Fix mutation tests

457098a

Fix lints

ab307e2

Make deposit UTxO smaller in increment mutation tests

8d13c23

generateWith uses size 30 and this is too big of utxo to deposit.

Define capped realistic ada using size and max supply

650fd4b

Also ensures the minimum lovelace in an output using default pparams.

ch1bo force-pushed the deposit-value-fix branch from 63029ec to 650fd4b Compare May 15, 2025 06:29

ch1bo added a commit that referenced this pull request May 15, 2025

Deposit fixes with deadline too soon (#1969 #1974 #1977)

83de1f5

ch1bo merged commit 650fd4b into master May 15, 2025
20 checks passed

ch1bo deleted the deposit-value-fix branch May 15, 2025 12:42

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Deposit value fix #1969

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Transaction cost differences

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Transaction costs

Script summary

Init transaction costs

Commit transaction costs

CollectCom transaction costs

Cost of Increment Transaction

Cost of Decrement Transaction

Close transaction costs

Contest transaction costs

Abort transaction costs

FanOut transaction costs

End-to-end benchmark results

Baseline Scenario

Memory data

Three local nodes

Memory data

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`Init` transaction costs

`Commit` transaction costs

`CollectCom` transaction costs

`Close` transaction costs

`Contest` transaction costs

`Abort` transaction costs

`FanOut` transaction costs

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