Arqma Blockchain Explorer

(No Javascript | No Cookies | No Web Analytics Trackers | No Images | Open Sourced)

Server Time: 2026-09-05 19:55:15 | Transaction Pool | Autorefresh is OFF | Go to stagenet explorer | Go to mainnet explorer

Network difficulty: 108000098 | Hard fork: v19 | Hash rate: 900.000 kH/s | Staking Requirement: 100000.000000000 ARQ | Fee: 0.000000050/byte + 0.000090000/output | Median block size limit: 1024.00 kB | Data From 00:00:35 [h:m:s] ago

TX Types Legend: Registration: 🏁 | Contribution: ⚑ | Recommission: 👍 | Decommission: 👎 | Deregister: 🚫 | IP Change Penalty: 📋 | Stake Unlock: 🔓

Arqma emission (fees) is 40209485.239012659 (1053.906288059) as of 2018959 block

Transaction Pool

(No Of TXs: 0, Size: 0.0000 kB, Updated every 5 seconds)

Age [HH:MM:SS]

Type

Transaction Hash

Fee/Per kB

In/Out

TX Size [kB]

Transactions In Older Blocks

(Median size of 100 blocks: 1024.00 kB)

Height	Age [y:d:h:m:s]	Size [kB]	Type	Transaction Hash	Fee	Outputs	In/Out	TX Size [kB]
1354159	02:264:16:56:40	0.0996		06635b33450978235250dc6408727b824196838d98ff62fcad5da0ae8ad6af3b	N/A	12.060225677	0/1	0.0996
1354158	02:264:16:58:40	0.0996		c3fe776090efee2ac131b854d03d8711404ccbc7a56d000f7a448d02cb2b4259	N/A	12.060231428	0/1	0.0996
1354157	02:264:16:59:55	5.9697		75ba77241d1ecea27135c14900da5c9315939b264dd78f0e3c49fef8e596ddba	N/A	12.060243189	0/1	0.0996
				2845c6a02f33a4189bf9c1053699bd6523aaef7b13a3ade81e92e635584e0637	0.000006010	?	6/2	5.8701
1354156	02:264:17:02:13	2.7412		2184fbdd5ddb57967e15b9f03d7c13a095c9a0c044fc86a140b0892d3180c6ed	N/A	12.060245619	0/1	0.0996
				9926217a4c9b2ce58df36924d0c20a364e4ce31a7ff883421b5d83b7ad03d412	0.000002690	?	2/2	2.6416
1354155	02:264:17:03:52	0.0996		02a01422637068b5e4a6b700241315b726098976c0b999a6be23ed2245073add	N/A	12.060248680	0/1	0.0996
1354154	02:264:17:06:04	0.0996		8abccc81317e93e3ba7d2505ea23b305be6bd28f9cecae0ce676fc305a646f02	N/A	12.060254431	0/1	0.0996
1354153	02:264:17:06:48	4.3555		edf69447853fe65b41ff6e54f731039a66d0744925e98713a5be579d1648eb10	N/A	12.060264532	0/1	0.0996
				fa136716f1a6e7e8584ce6f1edcbe3d6b123ebea5829fbfc5b92e7f200b9bd8d	0.000004350	?	4/2	4.2559
1354152	02:264:17:08:19	0.0996		7759ca64496344a2502fdc7947f8a761c8bc6a51ab4697880eb63e0cc50009ba	N/A	12.060265932	0/1	0.0996
1354151	02:264:17:08:50	6.3906		077b76c1451b84d8b4b423e07822e55e99ba38f555e12fd9fd7dc545838f629a	N/A	12.060278073	0/1	0.0996
				85027a03608c149abdc01bf5deb81beb90f2d1891aef73ba95476d8dc21d457d	0.000002680	?	2/2	2.6289
				c10528bfe2f92f26d319e584c4e3125541e02d84b670f140ce17f841f3e73c79	0.000001850	?	1/2	1.8252
				408f9f8e979ce35e1c7e2456905daa28645c6e4a85e68e4f800b655de808e3a3	0.000001860	?	1/2	1.8369
1354150	02:264:17:11:16	0.0996		2c761ad48262131219f1d284b7a452e42305532a79d447240b7f127b2c980008	N/A	12.060277434	0/1	0.0996
1354149	02:264:17:12:21	6.9844		f9d0669b539c300fb264e793910cd3e44c8630ca37bea12b2c62431fa6cd1d0e	N/A	12.060290225	0/1	0.0996
				9646ad6991aaf539000a55d07b92e53d96bcef006047524d3dff2a083d450fa5	0.000003520	?	3/2	3.4424
				b1daeaf136c17dd6d49b5b1fcffdbd90082f14c87c7016f28e2aa223b8a6dff7	0.000003520	?	3/2	3.4424
1354148	02:264:17:19:12	0.0996		92bdb3806563891463211f6658d9033253c260b612ea163a7b0cf400a743e1ef	N/A	12.060288936	0/1	0.0996
1354147	02:264:17:19:29	2.7285		7baeb194c4e744f093769f8ea1796850b73489604816a02095e3cb187e630047	N/A	12.060297366	0/1	0.0996
				20a01b81f38e5ff4ec90e61052ed9e5a56720fabb56da5447a4baffd6e1c4fbd	0.000002680	?	2/2	2.6289
1354146	02:264:17:25:04	0.0996		fa334298fb0001ac50a56821d567c8468f250721ca66f414953128ee0b15499a	N/A	12.060300437	0/1	0.0996
1354145	02:264:17:26:36	0.0996		f4550e33b54756f9de7fd2ae0a41381fe0c2b7e8f61c98a43c1843fd1946c645	N/A	12.060306188	0/1	0.0996
1354144	02:264:17:27:30	11.8408		f03fa19c7c32bf67536c67a55b4ad6ac03c65f33b5d913623b85824916eebf77	N/A	12.060323959	0/1	0.0996
				9774812ca6f314118ede29b3bb46068fa8c3ec886d504d2dea95de95425ad85f	0.000007670	?	8/2	7.4834
				f50319e13c58ad050ea8880f6ffd6744fc2131680c5a29cba5c4de78d129f395	0.000004350	?	4/2	4.2578
1354143	02:264:17:32:23	0.0996		dba297997af5f2c42453b72a4d6f5603092b21895d09a33c8ce1b862bb4e88d2	N/A	12.060317690	0/1	0.0996
1354142	02:264:17:33:13	0.0996		7256632061b487da7e684efa09e142d14d53db96588a51777976403894c72098	N/A	12.060323440	0/1	0.0996
1354141	02:264:17:34:44	0.0996		4b74a00f66255ca4b409a551e9aaf5eeb34d9140360d4bbcfa2ad16996651528	N/A	12.060329191	0/1	0.0996
1354140	02:264:17:35:09	0.0996		9e94398dc639c90bf82ade83e875ab303f463acb185cb9e6aad73332f36c3a3e	N/A	12.060334942	0/1	0.0996

Current Page: 33240/100948

0 service nodes awaiting contributions, 2 decommissioned service nodes, and 47 active service nodes.

Service Nodes Awaiting Contributions (0)

Public Key

Contributors

Operator Fee (%)

Contributed

Open For Contribution

Min. Contribution

Expiry Date UTC (Estimated)

Inactive/Decommissioned Service Nodes (2)

(These service nodes are currently decommissioned for failing network obligations, are not earning rewards, and face deregistration soon)

Public Key	Contributors	Operator Fee (%)	Decommission Height	Last Uptime Proof	Blocks until Dereg.
5a67c6e399571ec4665cc61cc19a5e84eeab60cf51c4f75fac5eea24a33d87e0	2/12	60	2001666	07:21:17:08	None (deregistration imminent!)
cf8f65a97c31057a45dec63b065e23d0763c1ea88c7282fafd738e3e090ef01b	2/12	70	2001666	06:21:29:47	None (deregistration imminent!)

Active Service Nodes (47)

Public Key	Contributors	Operator Fee (%)	Staking Requirement	Last Reward Height	Last Uptimr Proof	Expiry Date UTC (Estimated)
0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb	1/12		100000.000000000	2018913	01:14:00:29	Staking Infinitely
139595b1c4670eb35a9cc6d32b6c351c53422d6ebf9405d0e2de6edb09afa5f2	1/12		100000.000000000	2018914	00:19:37	Staking Infinitely
3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7	2/12	44	100000.000000000	2018915	02:15:19	Staking Infinitely
4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21	1/12		100000.000000000	2018916	00:18:58	Staking Infinitely
5d21979e8b9332bfc583b3855b5e1b047080dce4609a21454595892ca797f514	1/12		100000.000000000	2018917	00:06:58	Staking Infinitely
81ea05da87ecfe7d707a13ded483e5a0ee257c3ff802cd01742185bc87d803d9	1/12		100000.000000000	2018918	00:43:57	Staking Infinitely
83b11eca71c4a2d77d256304fd422493ed4d290e3cb084bf76758d239fe9a0b4	1/12		100000.000000000	2018919	00:44:14	Staking Infinitely
a382ea37422bc7715fb954fd567ae77c7b8db3bf92a2d4ac48025e0122832641	2/12	60	100000.000000000	2018920	01:43:13	Staking Infinitely
bf84fec11377bd3f6a46c27484a8f46050274067047fefe4b15cfd566d68a671	1/12		100000.000000000	2018921	00:39:07	Staking Infinitely
c98ab9fca45aec5e9c8ea6f7dd0660b3567e3691d3cfbc4e4b035e737706160b	2/12	33	100000.000000000	2018922	00:00:54	Staking Infinitely
+ 37 more ↪

click here to see the full service node lists (at most only 10 of each list are shown here)

Uptime quorum for height 2018957)

Validators 10:
Public Key	Last Uptime Proof	Expiry Date UTC (Estimated)
0: ab1264fe8acaba585069c1fb0afe0804a97bc00ef269c17231b7994024851111	00:10:55	Staking Infinitely (N/A)
1: 3a695a55e9442573865950ec85b393e7ade3a76690b62d0e992f32f246943bd1	03:53:17	Staking Infinitely (N/A)
2: 3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7	02:15:19	Staking Infinitely (N/A)
3: 781efae048bb90829a0c7ce9f4c9c34e572d236955e91f4b3c86a85effa632d5	00:42:49	Staking Infinitely (N/A)
4: 2c9277494767de038291669f392ceb66b3889c23c574ab42db08e0b48ee8a7bf	00:29:07	Staking Infinitely (N/A)
5: 2f235e88eada0dcabd49b9f2ee0fcd1002dbfabfe7dc273dc445e1e8abc220c0	00:43:40	Staking Infinitely (N/A)
6: 53b13c3b12f633765fad6a3af5e9910067af666c8c35940a5d0190ef05e86016	00:15:12	Staking Infinitely (N/A)
7: 848ad910440f790d4a687cad83b333f99dec1fb47bae617c7a02db65b2f1c244	17:53:42	Staking Infinitely (N/A)
8: 80a869c7963e4c92ccd1032749e29b33e7e943f4e70cbe8d9a3110115a0a53e3	02:08:24	Staking Infinitely (N/A)
9: c338966f59c208f065e570e4631dced159118467b174e2cadc0bd59ff4768987	00:23:41	Staking Infinitely (N/A)
Nodes to test (39):
0: 45f9349a3ceee3a75d6142204286d37dacf81c1f9ec01a65e7b716269726635d	00:10:18	Staking Infinitely (N/A)
1: a382ea37422bc7715fb954fd567ae77c7b8db3bf92a2d4ac48025e0122832641	01:43:13	Staking Infinitely (N/A)
2: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab	01:46:17	Staking Infinitely (N/A)
3: c442b8c2be6b9175211390d4dbf3d3c6b9c8132517335eabbffce8b68da71b36	00:03:18	Staking Infinitely (N/A)
4: 33ef2ff577821dfc3e8ba0b6a7b62759f092c53d798cc1a9c5ba85f59f549efc	00:18:39	Staking Infinitely (N/A)
5: b98ee2847b18dc4e46be8e384d59157a67a5366ee8b03553c519b520e147ef65	00:22:03	Staking Infinitely (N/A)
6: afb246351ed7e9eadff997ae1ebcfcdd297bfabfc15398a8202ffcf1e3ceeb54	01:27:18	Staking Infinitely (N/A)
7: 4a9a479460d135c51723254462919ff51e4b692f2bc4aedafb26316494f45a64	00:31:30	Staking Infinitely (N/A)
8: af591de4390b7c96bab0312158a390b186bf4064e306538b51b5621bbc314185	00:31:36	Staking Infinitely (N/A)
9: 30f9c742e16707fb9b0c9c2078ed750595e297e4a0f75b972794766e25447cfc	00:18:09	Staking Infinitely (N/A)
+ 29 more ↪

Uptime quorum for height 2018956)

Validators 10:
Public Key	Last Uptime Proof	Expiry Date UTC (Estimated)
0: d3e9da49cf45266c3a0270253b0e2921dcbf939cfa52e5de31130d9ef5fb921d	01:00:59:43	Staking Infinitely (N/A)
1: 5d21979e8b9332bfc583b3855b5e1b047080dce4609a21454595892ca797f514	00:06:58	Staking Infinitely (N/A)
2: c99d98eadc123984ca4f9042e6e2e3460e43467a7136f61f7f0960ef92fec01e	00:15:57	Staking Infinitely (N/A)
3: 30f9c742e16707fb9b0c9c2078ed750595e297e4a0f75b972794766e25447cfc	00:18:09	Staking Infinitely (N/A)
4: e9ce4cbc023dd13600dd1b84e811838cccc09a169ab6cb51f537481242bddb1a	00:11:49	Staking Infinitely (N/A)
5: 139595b1c4670eb35a9cc6d32b6c351c53422d6ebf9405d0e2de6edb09afa5f2	00:19:37	Staking Infinitely (N/A)
6: c6c5fce08eef76dca701248665f0586f83da2243ba13781899abc525b3572063	00:22:33	Staking Infinitely (N/A)
7: 81ea05da87ecfe7d707a13ded483e5a0ee257c3ff802cd01742185bc87d803d9	00:43:57	Staking Infinitely (N/A)
8: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab	01:46:17	Staking Infinitely (N/A)
9: 2083e7a16cef72aced08ba92106bf9cff6725bede937ff82c1156fd7fa2f3c7a	02:42:53	Staking Infinitely (N/A)
Nodes to test (39):
0: 3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7	02:15:19	Staking Infinitely (N/A)
1: b42fb5a319f9ef592ada30e483b64431d05386ba5692727d0e64a15802be3ef5	00:22:26	Staking Infinitely (N/A)
2: 848ad910440f790d4a687cad83b333f99dec1fb47bae617c7a02db65b2f1c244	17:53:42	Staking Infinitely (N/A)
3: 45f9349a3ceee3a75d6142204286d37dacf81c1f9ec01a65e7b716269726635d	00:10:18	Staking Infinitely (N/A)
4: b98ee2847b18dc4e46be8e384d59157a67a5366ee8b03553c519b520e147ef65	00:22:03	Staking Infinitely (N/A)
5: 76e3e01fe63166ca4e448a2d9353486dbf966804c0eb51437d135fdd93e3eb3f	00:18:59	Staking Infinitely (N/A)
6: 5a67c6e399571ec4665cc61cc19a5e84eeab60cf51c4f75fac5eea24a33d87e0	07:21:17:08	Staking Infinitely (N/A)
7: 4a9a479460d135c51723254462919ff51e4b692f2bc4aedafb26316494f45a64	00:31:30	Staking Infinitely (N/A)
8: f0e1913158cd650f98270490ded011fc138bb0a18bce9dcb796276b58f32340a	00:20:56	Staking Infinitely (N/A)
9: ca0113d6999df9187b7959b602c7557cf9658a274fd89948c5aead79eb95a510	00:19:48	Staking Infinitely (N/A)
+ 29 more ↪

Uptime quorum for height 2018955)

Validators 10:
Public Key	Last Uptime Proof	Expiry Date UTC (Estimated)
0: 53b13c3b12f633765fad6a3af5e9910067af666c8c35940a5d0190ef05e86016	00:15:12	Staking Infinitely (N/A)
1: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab	01:46:17	Staking Infinitely (N/A)
2: afb246351ed7e9eadff997ae1ebcfcdd297bfabfc15398a8202ffcf1e3ceeb54	01:27:18	Staking Infinitely (N/A)
3: 94b370885630009cbe68165b641e51343bcb90aba151434230424f6e3ec4a6d2	15:13:11	Staking Infinitely (N/A)
4: e9ce4cbc023dd13600dd1b84e811838cccc09a169ab6cb51f537481242bddb1a	00:11:49	Staking Infinitely (N/A)
5: 45f9349a3ceee3a75d6142204286d37dacf81c1f9ec01a65e7b716269726635d	00:10:18	Staking Infinitely (N/A)
6: 80a869c7963e4c92ccd1032749e29b33e7e943f4e70cbe8d9a3110115a0a53e3	02:08:24	Staking Infinitely (N/A)
7: 4a9a479460d135c51723254462919ff51e4b692f2bc4aedafb26316494f45a64	00:31:30	Staking Infinitely (N/A)
8: 30f3281710c23bb2c9b11a8bc0a3f63876ad2d974a55f08db00dde2f1fce4f3e	00:44:05	Staking Infinitely (N/A)
9: c6c5fce08eef76dca701248665f0586f83da2243ba13781899abc525b3572063	00:22:33	Staking Infinitely (N/A)
Nodes to test (39):
0: 4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21	00:18:58	Staking Infinitely (N/A)
1: 28f7c771d9cd63b4c3d5c8261c153f7e05f23f67a562dc5c39635445e1d1d268	00:20:54	Staking Infinitely (N/A)
2: b98ee2847b18dc4e46be8e384d59157a67a5366ee8b03553c519b520e147ef65	00:22:03	Staking Infinitely (N/A)
3: 2083e7a16cef72aced08ba92106bf9cff6725bede937ff82c1156fd7fa2f3c7a	02:42:53	Staking Infinitely (N/A)
4: 3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7	02:15:19	Staking Infinitely (N/A)
5: 5d21979e8b9332bfc583b3855b5e1b047080dce4609a21454595892ca797f514	00:06:58	Staking Infinitely (N/A)
6: 0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb	01:14:00:29	Staking Infinitely (N/A)
7: 2f235e88eada0dcabd49b9f2ee0fcd1002dbfabfe7dc273dc445e1e8abc220c0	00:43:40	Staking Infinitely (N/A)
8: b42fb5a319f9ef592ada30e483b64431d05386ba5692727d0e64a15802be3ef5	00:22:26	Staking Infinitely (N/A)
9: 5a67c6e399571ec4665cc61cc19a5e84eeab60cf51c4f75fac5eea24a33d87e0	07:21:17:08	Staking Infinitely (N/A)
+ 29 more ↪

Checkpoint quorum for height 2018956 (determined by block 2018945)

Public Key	Last Uptime Proof	Expiry Date UTC (Estimated)
0: c442b8c2be6b9175211390d4dbf3d3c6b9c8132517335eabbffce8b68da71b36	00:03:18	Staking Infinitely (N/A)
1: b42fb5a319f9ef592ada30e483b64431d05386ba5692727d0e64a15802be3ef5	00:22:26	Staking Infinitely (N/A)
2: 30f3281710c23bb2c9b11a8bc0a3f63876ad2d974a55f08db00dde2f1fce4f3e	00:44:05	Staking Infinitely (N/A)
3: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab	01:46:17	Staking Infinitely (N/A)
4: 30f9c742e16707fb9b0c9c2078ed750595e297e4a0f75b972794766e25447cfc	00:18:09	Staking Infinitely (N/A)
5: 53b13c3b12f633765fad6a3af5e9910067af666c8c35940a5d0190ef05e86016	00:15:12	Staking Infinitely (N/A)
6: ab1264fe8acaba585069c1fb0afe0804a97bc00ef269c17231b7994024851111	00:10:55	Staking Infinitely (N/A)
7: 28f7c771d9cd63b4c3d5c8261c153f7e05f23f67a562dc5c39635445e1d1d268	00:20:54	Staking Infinitely (N/A)
8: 80a869c7963e4c92ccd1032749e29b33e7e943f4e70cbe8d9a3110115a0a53e3	02:08:24	Staking Infinitely (N/A)
9: f9e9aa7608c8c134ff9c14ef92488c122b947fd27d8cfe31d6745546c462665b	00:31:53	Staking Infinitely (N/A)
10: af591de4390b7c96bab0312158a390b186bf4064e306538b51b5621bbc314185	00:31:36	Staking Infinitely (N/A)
11: 848ad910440f790d4a687cad83b333f99dec1fb47bae617c7a02db65b2f1c244	17:53:42	Staking Infinitely (N/A)
12: c6c5fce08eef76dca701248665f0586f83da2243ba13781899abc525b3572063	00:22:33	Staking Infinitely (N/A)
13: 4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21	00:18:58	Staking Infinitely (N/A)
14: 76e3e01fe63166ca4e448a2d9353486dbf966804c0eb51437d135fdd93e3eb3f	00:18:59	Staking Infinitely (N/A)
15: 83b11eca71c4a2d77d256304fd422493ed4d290e3cb084bf76758d239fe9a0b4	00:44:14	Staking Infinitely (N/A)
16: c99d98eadc123984ca4f9042e6e2e3460e43467a7136f61f7f0960ef92fec01e	00:15:57	Staking Infinitely (N/A)
17: 75ed97a747c6b790917a62befd733ec67df8a7b5a9861baa432521eaa788d2e2	00:23:01	Staking Infinitely (N/A)
18: c93716c955d7ced8be22fb112a0344fabde019949f2b26fedff327172ba6a973	01:14:38	Staking Infinitely (N/A)
19: aa78babccc4e6e29d3becac648489e6da5c375ae22566dd9cc65880210d81539	00:08:57	Staking Infinitely (N/A)

Note: The quorum shown here is the currently active voting height which is not necessarily the latest quorum. Quorums can only be voted on after a number of blocks have transpired.

Click here to see the last 1hrs worth of the stored quorum states

Last 5 checkpoints

Height	Block hash	Checkpoint Quorum
2018956	5743009046a8e55d3f4d7fb6474d3ef4f5a17d76ba3f1bde0c062e5a7c151a1f	2018956; 11/20 signatures: ✓ ✓ ✓ x ✓ ✓ x ✓ x ✓ x x x x ✓ ✓ ✓ x x ✓
2018952	bbd773a34b82efb435175cc7595b5fad70c1db7829367f12d43e1f3784bc3daa	2018952; 8/20 signatures: x x x x x ✓ ✓ ✓ x x ✓ x ✓ x x x x ✓ ✓ ✓
2018940	890f8ebcc22ff4584c343a71be6c91c56ac629d7cdbb329deea988642936ef71	2018940; 11/20 signatures: x ✓ ✓ x x ✓ ✓ x ✓ x ✓ ✓ x x x ✓ ✓ ✓ x ✓
2018880	ac28cd543c20b1be180ddb350eb6df2ef97ab9f81102718c0979dc5843851e8a	2018880; 9/20 signatures: ✓ x ✓ x x x x ✓ ✓ x x x ✓ x ✓ x ✓ x ✓ ✓
2018820	116c31e8bafa040fa07a17bb7dfd1c8b21f049ea6631a797f092d8604d81e0ee	2018820; 8/20 signatures: ✓ x ✓ x ✓ x x ✓ x ✓ ✓ x x x ✓ x x x x ✓

Check here to see the last 50 checkpoints

No javascript / No web analytics trackers / No cookies / No external resources / Open Sourced
Explorer Version (api): patches-2025-08-25-05fdb31 (8.0) Arqma Version: 10.0.0-4b067e8c_Release
Latest source code
Forked from: onion-monero-blockchain-explorer
Copyright (C), 2019-2025 arqma.com