Fanout: Always rely on observed utxo

[v0d1ch]

• Instead of relying on the local state to display information on fanned out UTxO always display what we actually observed on-chain.

---

• CHANGELOG updated or not needed
• Documentation updated or not needed
• Haddocks updated or not needed
• No new TODOs introduced or explained herafter

[github-actions]

Transaction cost differences

Script summary

Name	Size (Bytes)
νInitial	-
νCommit	-
νHead	-
μHead	-
νDeposit	-

Init transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
40	-	-	-	-

Commit transaction costs

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
54	-	-	-	-

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-	-
2	-	-	-	-	-
3	-	-	-	-	-
4	-	-	-	-	-
5	-	-	-	-	-
6	-	-	-	-	-
7	-	-	-	-	-
8	-	-	-	-	-

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	$${\color{green}-0.39}$$	$${\color{green}-0.09}$$	-
2	-	-	-	-
3	-	$${\color{green}-0.39}$$	$${\color{green}-0.09}$$	-
5	-	-	-	-
10	-	-	-	-
37	-	$${\color{green}-0.39}$$	$${\color{green}-0.09}$$	-

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
40	-	-	-	-

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
34	-	-	-	-

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
27	-	-	-	-

FanOut transaction costs

UTxO, Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
(0, 10)	-	-	-	-	-
(1, 10)	-	-	-	-	-
(5, 10)	-	-	-	-	-
(10, 10)	-	-	-	-	-
(20, 10)	-	-	-	-	-
(37, 10)	-	-	-	-	-

[github-actions]

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	2025-04-02 08:23:33.957771618 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	0e35115a2c7c13c68ecd8d74e4987c04d4539e337643be20bb3274bd	14756
μHead	57166715eadb8d3135964325c016eea546c21e1c0aae974ca67df9a5*	5541
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	6091	11.23	3.50	0.53
2	6294	13.56	4.22	0.57
3	6500	15.50	4.80	0.60
5	6897	20.56	6.38	0.67
10	7907	30.97	9.53	0.82
40	13935	98.88	30.39	1.78

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	738	3.38	1.73	0.22
3	919	4.36	2.33	0.24
5	1283	6.41	3.60	0.28
10	2177	12.13	7.25	0.40
54	10059	98.61	68.52	1.88

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	525	25.64	7.39	0.43
2	114	636	34.88	9.98	0.53
3	169	747	46.10	13.08	0.65
4	226	858	51.90	14.84	0.71
5	282	969	61.18	17.48	0.81
6	341	1085	67.80	19.50	0.89
7	393	1192	90.60	25.26	1.12
8	450	1303	96.32	27.07	1.18
9	506	1414	99.27	28.23	1.22

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1789	25.42	8.31	0.49
2	1886	25.59	8.99	0.50
3	2072	28.81	10.69	0.55
5	2380	32.93	13.37	0.62
10	3132	41.86	19.57	0.77
36	7138	94.40	53.92	1.62

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	623	23.71	7.55	0.42
2	730	24.89	8.50	0.44
3	873	27.26	9.84	0.48
5	1179	31.55	12.36	0.55
10	2186	46.23	19.71	0.76
38	6089	94.91	51.81	1.56

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	647	30.95	9.68	0.50
2	909	31.69	10.76	0.52
3	1011	33.48	11.96	0.55
5	1217	36.48	14.10	0.60
10	2106	48.16	21.43	0.79
32	5192	96.76	51.14	1.53

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	678	35.95	11.00	0.55
2	872	38.89	12.65	0.59
3	937	40.28	13.63	0.62
5	1285	45.17	16.54	0.69
10	1875	55.38	22.80	0.84
27	4557	97.73	47.73	1.48

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	5989	28.29	9.33	0.71
2	6090	37.31	12.30	0.81
3	6193	43.50	14.30	0.88
4	6389	56.76	18.78	1.03
5	6448	59.82	19.67	1.06
6	6697	77.36	25.60	1.25
7	6817	83.70	27.66	1.33
8	6768	90.01	29.62	1.39

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	0	0	6091	19.66	6.46	0.62
10	1	57	6125	22.18	7.42	0.65
10	5	285	6261	31.69	11.06	0.76
10	10	569	6430	40.50	14.57	0.87
10	20	1139	6770	63.18	23.30	1.13
10	37	2104	7347	99.40	37.34	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 2025-04-02 08:26:50.035122991 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	4.929723783
P99	15.320391379999995ms
P95	5.83018015ms
P50	4.399369ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-04-02 08:25:34.006161122 UTC	869M	3786M
2025-04-02 08:25:39.006266271 UTC	996M	3538M
2025-04-02 08:25:44.006159877 UTC	1027M	3506M
2025-04-02 08:25:49.006136283 UTC	1027M	3506M
2025-04-02 08:25:54.006086273 UTC	1026M	3506M
2025-04-02 08:25:59.006252727 UTC	1024M	3508M

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	31.885185432
P99	63.84329004999999ms
P95	49.61539439999999ms
P50	29.6065085ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-04-02 08:26:12.710579346 UTC	933M	3608M
2025-04-02 08:26:17.710586359 UTC	1198M	3342M
2025-04-02 08:26:22.712521185 UTC	1242M	3243M
2025-04-02 08:26:27.71181769 UTC	1255M	3176M
2025-04-02 08:26:32.710569965 UTC	1261M	3168M
2025-04-02 08:26:37.710544837 UTC	1261M	3167M
2025-04-02 08:26:42.710552625 UTC	1263M	3165M
2025-04-02 08:26:47.710545241 UTC	1275M	3152M

[ch1bo]

Looks good now. Only minor comments left