Arqma Blockchain Explorer

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

Server Time: 2026-09-08 07:50:12 | Transaction Pool | Autorefresh is OFF | Go to stagenet explorer | Go to mainnet explorer

Network difficulty: 205000139 | Hard fork: v19 | Hash rate: 1.708 MH/s | Staking Requirement: 100000.000000000 ARQ | Fee: 0.000000050/byte + 0.000090000/output | Median block size limit: 1024.00 kB | Data From 00:00:29 [h:m:s] ago

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

Arqma emission (fees) is 40258379.239012659 (1054.388937009) as of 2020645 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 [d:h:m:s] Size [kB] Type Transaction Hash Fee Outputs In/Out TX Size [kB]
1796205 338:18:32:58 0.3291 78eecd73e58771d11fffb70c4f4ffe69477c74eea48cf0f9ab6fddca738c6eb9 N/A 29.000000000 0/5 0.3291
1796204 338:18:33:00 0.3291 2471d706009715fef424fce5d91ed0368c361aa165819a4fcada919baf9992de N/A 29.000000000 0/5 0.3291
1796203 338:18:36:19 0.3691 752ad55766ca519842bddaed48c28366d6b2e25da2c8bcf8073e9df7de643a31 N/A 29.000000000 0/6 0.3691
1796202 338:18:36:48 0.3691 f823fa2825a31f1ee18f0c7b6844ddbc672e00d5131abb2edd0a1acace4abc5b N/A 29.000000000 0/6 0.3691
1796201 338:18:37:55 0.3291 b736590e345bdb924100cfb05a45b266ad2fc41eea2c60d9e5a4753bebffae92 N/A 29.000000000 0/5 0.3291
1796200 338:18:40:23 9.7871 5d455eb65c0d6690f3f0a4cedada8d07cda13849a89a5101475afa7063da5d8d N/A 29.000484250 0/5 0.3291
022ced82400ac1557461867fb6c0abe5c45fdfb42b595f7816dc7bff5e621e71 0.000088600 ? 1/2 1.7305
c14e90acf6f26f98d901d6416a89706cc29de8e1fb3a1eecd129ebabdc202601 0.000088550 ? 1/2 1.7295
62f226366a6f603df848808ac440d854a38ccc1c115bc5354e5410bdaa4098c5 0.000129750 ? 2/2 2.5342
76fed82fd7c64b3953eb6e1b30f6bde8f357dc56d66eed9fb464e23484ccad2b 0.000088650 ? 1/2 1.7314
bf42215bcf03e29ea85865b5f70f128aeb107d5f1875868e6d3043ccdfd09dbe 0.000088700 ? 1/2 1.7324
1796199 338:18:41:32 2.8721 d1c1bb23f92b1b322abd4570acf4b1860eec51452c710dbb6c7b809991403419 N/A 29.000651000 0/5 0.3291
b7c6c96bca83b92a0ede666ab04f30be0f80ea5184c8b5a2cde8b65f4fef8a5c 0.000651000 ? 2/2 2.5430
1796198 338:18:45:57 0.3291 db9bc0e33a0ad2f8f32e511942c59846c470a2f9418c9467a95c7afba2171feb N/A 29.000000000 0/5 0.3291
1796197 338:18:46:41 0.3691 0bbd1cdf845644dfa06ffde866f9979b7eea2f8c55a1808115f4a3f41818b4c2 N/A 29.000000000 0/6 0.3691
1796196 338:18:48:31 0.4092 592025252219144c9abce0725b0c7abb564c64ca8047ed494cdda4766cea1c7a N/A 29.000000000 0/7 0.4092
1796195 338:18:48:37 0.3291 7b5b16b2b5d6724ab054a04f912b506ae0506d5e353e9783b6cce20f5ee98198 N/A 29.000000000 0/5 0.3291
1796194 338:18:49:06 0.3691 38c2938e870bcecf74c91f82dea9a4b63950bca2b7181dcd9a84a0f8a76e871f N/A 29.000000000 0/6 0.3691
1796193 338:18:50:15 0.3291 cd9fcbfecc8382bd7718395bf71250b40e760a2802821165e38f0bcbac12c8c7 N/A 29.000000000 0/5 0.3291
1796192 338:18:50:49 0.3691 1e34bea0bf54dfce3e6161f2dc8381962b23712c6c815dee5c964fac228d0fba N/A 29.000000000 0/6 0.3691
1796191 338:18:52:42 13.9502 6540c8e9486f87da473aa54e189374c62fbe6884a210cac266a3bac7deb156f4 N/A 29.000697400 0/5 0.3291
8459a03a5f7996b1b1e0266289f9125cf3e575f3652c18272b58516408738029 0.000130100 ? 2/2 2.5410
200d28285ece219795724ceb4a449fcd7d57bf354205c5b0759f485171bfee80 0.000130100 ? 2/2 2.5410
976c205cd0239317f373e86594a5243b79be749dbe608737c7f177f60f77098b 0.000129950 ? 2/2 2.5381
a0fefe6714e7fb2eb62990f8941387105c538672b93dd334d9e568da6c9c4567 0.000088600 ? 1/2 1.7305
7806871bdc552bc8866f6b20189fbd3ea2dacb6e51ab567c2ef48b2682d93c88 0.000130050 ? 2/2 2.5400
d7f5dcb6e1f9e7d54d130f679f80dd088a72a9fe7222c840e594e7c52f1fff34 0.000088600 ? 1/2 1.7305
1796190 338:18:53:01 0.3691 c85dd9eb459a648e771fe627aae1afb034018207fd9de927b395d6ba36d7ebe6 N/A 29.000000000 0/6 0.3691
1796189 338:18:56:19 0.3291 4579353a71308775d17a3f9d8fa8653238e53f7088bd5778b21aad59aa79b75d N/A 29.000000000 0/5 0.3291
1796188 338:19:01:29 0.3291 2fa184135e1d62104d398dc8bcdf6bf41129fd40ecc7e57d212382b0dfafbe48 N/A 29.000000000 0/5 0.3291
1796187 338:19:01:54 0.3691 67c93ff1bf27fd4d3121596df96b30b51c45ea4100ab6b80702e31f596a56cef N/A 29.000000000 0/6 0.3691
1796186 338:19:05:10 0.3691 2e45b525276cd4c9a838566c9b32646268efe360a0cead9f3db9ead804b7a356 N/A 29.000000000 0/6 0.3691
Prev
Current Page: 11222/101032
Next

Service Nodes

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 10:09:12:05 None (deregistration imminent!)
cf8f65a97c31057a45dec63b065e23d0763c1ea88c7282fafd738e3e090ef01b 2/12 70 2001666 09:09:24:44 None (deregistration imminent!)

Active Service Nodes (47)

Public Key Contributors Operator Fee (%) Staking Requirement Last Reward Height Last Uptimr Proof Expiry Date UTC (Estimated)
64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab 4/12 66 100000.000000000 2020599 08:33:09 Staking Infinitely
c338966f59c208f065e570e4631dced159118467b174e2cadc0bd59ff4768987 4/12 50 100000.000000000 2020600 21:15:17 Staking Infinitely
d3e9da49cf45266c3a0270253b0e2921dcbf939cfa52e5de31130d9ef5fb921d 4/12 50 100000.000000000 2020601 23:32:36 Staking Infinitely
53b13c3b12f633765fad6a3af5e9910067af666c8c35940a5d0190ef05e86016 1/12 100000.000000000 2020602 00:34:39 Staking Infinitely
2083e7a16cef72aced08ba92106bf9cff6725bede937ff82c1156fd7fa2f3c7a 1/12 100000.000000000 2020603 14:55:07 Staking Infinitely
ca0113d6999df9187b7959b602c7557cf9658a274fd89948c5aead79eb95a510 1/12 100000.000000000 2020604 00:39:21 Staking Infinitely
0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb 1/12 100000.000000000 2020605 19:47:54 Staking Infinitely
139595b1c4670eb35a9cc6d32b6c351c53422d6ebf9405d0e2de6edb09afa5f2 1/12 100000.000000000 2020606 05:26:28 Staking Infinitely
3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7 2/12 44 100000.000000000 2020607 00:13:00 Staking Infinitely
4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21 1/12 100000.000000000 2020608 01:05:32:54 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 2020643)

Public Key Last Uptime Proof Expiry Date UTC (Estimated)
Validators 10:
0: c442b8c2be6b9175211390d4dbf3d3c6b9c8132517335eabbffce8b68da71b36 00:22:45 Staking Infinitely (N/A)
1: b42fb5a319f9ef592ada30e483b64431d05386ba5692727d0e64a15802be3ef5 00:40:45 Staking Infinitely (N/A)
2: f9e9aa7608c8c134ff9c14ef92488c122b947fd27d8cfe31d6745546c462665b 00:51:14 Staking Infinitely (N/A)
3: 4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21 01:05:32:54 Staking Infinitely (N/A)
4: 30f9c742e16707fb9b0c9c2078ed750595e297e4a0f75b972794766e25447cfc 00:37:32 Staking Infinitely (N/A)
5: 781efae048bb90829a0c7ce9f4c9c34e572d236955e91f4b3c86a85effa632d5 11:51:03 Staking Infinitely (N/A)
6: c98ab9fca45aec5e9c8ea6f7dd0660b3567e3691d3cfbc4e4b035e737706160b 00:14:41 Staking Infinitely (N/A)
7: ca0113d6999df9187b7959b602c7557cf9658a274fd89948c5aead79eb95a510 00:39:21 Staking Infinitely (N/A)
8: 81ea05da87ecfe7d707a13ded483e5a0ee257c3ff802cd01742185bc87d803d9 01:02:11 Staking Infinitely (N/A)
9: 76e3e01fe63166ca4e448a2d9353486dbf966804c0eb51437d135fdd93e3eb3f 00:38:27 Staking Infinitely (N/A)
Nodes to test (39):
0: 28f7c771d9cd63b4c3d5c8261c153f7e05f23f67a562dc5c39635445e1d1d268 00:40:28 Staking Infinitely (N/A)
1: af591de4390b7c96bab0312158a390b186bf4064e306538b51b5621bbc314185 09:28:18 Staking Infinitely (N/A)
2: afb246351ed7e9eadff997ae1ebcfcdd297bfabfc15398a8202ffcf1e3ceeb54 01:41:27 Staking Infinitely (N/A)
3: 5d21979e8b9332bfc583b3855b5e1b047080dce4609a21454595892ca797f514 00:25:15 Staking Infinitely (N/A)
4: 848ad910440f790d4a687cad83b333f99dec1fb47bae617c7a02db65b2f1c244 04:04:42 Staking Infinitely (N/A)
5: 361f463346d3409705042d85617b51e1c61f8821cc3c21f16ce9034d5b761c1f 00:36:42 Staking Infinitely (N/A)
6: a382ea37422bc7715fb954fd567ae77c7b8db3bf92a2d4ac48025e0122832641 12:26:27 Staking Infinitely (N/A)
7: c9839bdce086483c6fae8ede8600e4410c5dcd2a431148689480ddfd4c6c9363 04:26:32 Staking Infinitely (N/A)
8: 30f3281710c23bb2c9b11a8bc0a3f63876ad2d974a55f08db00dde2f1fce4f3e 01:02:23 Staking Infinitely (N/A)
9: d3e9da49cf45266c3a0270253b0e2921dcbf939cfa52e5de31130d9ef5fb921d 23:32:36 Staking Infinitely (N/A)
+ 29 more ↪

Uptime quorum for height 2020642)

Public Key Last Uptime Proof Expiry Date UTC (Estimated)
Validators 10:
0: 53b13c3b12f633765fad6a3af5e9910067af666c8c35940a5d0190ef05e86016 00:34:39 Staking Infinitely (N/A)
1: 5d21979e8b9332bfc583b3855b5e1b047080dce4609a21454595892ca797f514 00:25:15 Staking Infinitely (N/A)
2: 4a407bb5161d9ad488e4feb1ce4870d5076d223d24160476275f2e292c290d21 01:05:32:54 Staking Infinitely (N/A)
3: c6c5fce08eef76dca701248665f0586f83da2243ba13781899abc525b3572063 00:36:51 Staking Infinitely (N/A)
4: 050e45639e86a90ca465c5194642d9fee300ac170acdbb2c0144fc8ebaaf6b82 04:04:32 Staking Infinitely (N/A)
5: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab 08:33:09 Staking Infinitely (N/A)
6: 2c9277494767de038291669f392ceb66b3889c23c574ab42db08e0b48ee8a7bf 02:53:32 Staking Infinitely (N/A)
7: c99d98eadc123984ca4f9042e6e2e3460e43467a7136f61f7f0960ef92fec01e 00:35:31 Staking Infinitely (N/A)
8: f0e1913158cd650f98270490ded011fc138bb0a18bce9dcb796276b58f32340a 00:39:15 Staking Infinitely (N/A)
9: b42fb5a319f9ef592ada30e483b64431d05386ba5692727d0e64a15802be3ef5 00:40:45 Staking Infinitely (N/A)
Nodes to test (39):
0: 30f3281710c23bb2c9b11a8bc0a3f63876ad2d974a55f08db00dde2f1fce4f3e 01:02:23 Staking Infinitely (N/A)
1: 75ed97a747c6b790917a62befd733ec67df8a7b5a9861baa432521eaa788d2e2 11:28:12 Staking Infinitely (N/A)
2: af591de4390b7c96bab0312158a390b186bf4064e306538b51b5621bbc314185 09:28:18 Staking Infinitely (N/A)
3: 5a67c6e399571ec4665cc61cc19a5e84eeab60cf51c4f75fac5eea24a33d87e0 10:09:12:05 Staking Infinitely (N/A)
4: c442b8c2be6b9175211390d4dbf3d3c6b9c8132517335eabbffce8b68da71b36 00:22:45 Staking Infinitely (N/A)
5: 80a869c7963e4c92ccd1032749e29b33e7e943f4e70cbe8d9a3110115a0a53e3 14:19:00 Staking Infinitely (N/A)
6: 4a9a479460d135c51723254462919ff51e4b692f2bc4aedafb26316494f45a64 09:28:16 Staking Infinitely (N/A)
7: e9ce4cbc023dd13600dd1b84e811838cccc09a169ab6cb51f537481242bddb1a 00:30:05 Staking Infinitely (N/A)
8: ca0113d6999df9187b7959b602c7557cf9658a274fd89948c5aead79eb95a510 00:39:21 Staking Infinitely (N/A)
9: 0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb 19:47:54 Staking Infinitely (N/A)
+ 29 more ↪

Uptime quorum for height 2020641)

Public Key Last Uptime Proof Expiry Date UTC (Estimated)
Validators 10:
0: c442b8c2be6b9175211390d4dbf3d3c6b9c8132517335eabbffce8b68da71b36 00:22:45 Staking Infinitely (N/A)
1: 3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7 00:13:00 Staking Infinitely (N/A)
2: 139595b1c4670eb35a9cc6d32b6c351c53422d6ebf9405d0e2de6edb09afa5f2 05:26:28 Staking Infinitely (N/A)
3: 75ed97a747c6b790917a62befd733ec67df8a7b5a9861baa432521eaa788d2e2 11:28:12 Staking Infinitely (N/A)
4: 0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb 19:47:54 Staking Infinitely (N/A)
5: c93716c955d7ced8be22fb112a0344fabde019949f2b26fedff327172ba6a973 01:31:11 Staking Infinitely (N/A)
6: ab1264fe8acaba585069c1fb0afe0804a97bc00ef269c17231b7994024851111 00:14:43 Staking Infinitely (N/A)
7: 2c9277494767de038291669f392ceb66b3889c23c574ab42db08e0b48ee8a7bf 02:53:32 Staking Infinitely (N/A)
8: f0e1913158cd650f98270490ded011fc138bb0a18bce9dcb796276b58f32340a 00:39:15 Staking Infinitely (N/A)
9: 3a695a55e9442573865950ec85b393e7ade3a76690b62d0e992f32f246943bd1 16:06:36 Staking Infinitely (N/A)
Nodes to test (39):
0: aa78babccc4e6e29d3becac648489e6da5c375ae22566dd9cc65880210d81539 00:28:20 Staking Infinitely (N/A)
1: d3e9da49cf45266c3a0270253b0e2921dcbf939cfa52e5de31130d9ef5fb921d 23:32:36 Staking Infinitely (N/A)
2: 30f3281710c23bb2c9b11a8bc0a3f63876ad2d974a55f08db00dde2f1fce4f3e 01:02:23 Staking Infinitely (N/A)
3: 45f9349a3ceee3a75d6142204286d37dacf81c1f9ec01a65e7b716269726635d 00:27:40 Staking Infinitely (N/A)
4: c6c5fce08eef76dca701248665f0586f83da2243ba13781899abc525b3572063 00:36:51 Staking Infinitely (N/A)
5: cf8f65a97c31057a45dec63b065e23d0763c1ea88c7282fafd738e3e090ef01b 09:09:24:44 Staking Infinitely (N/A)
6: c9839bdce086483c6fae8ede8600e4410c5dcd2a431148689480ddfd4c6c9363 04:26:32 Staking Infinitely (N/A)
7: 64704fc7e91c0d73d5a05f608f0899b45e99fa711383057dcc59064a98c257ab 08:33:09 Staking Infinitely (N/A)
8: c338966f59c208f065e570e4631dced159118467b174e2cadc0bd59ff4768987 21:15:17 Staking Infinitely (N/A)
9: 361f463346d3409705042d85617b51e1c61f8821cc3c21f16ce9034d5b761c1f 00:36:42 Staking Infinitely (N/A)
+ 29 more ↪

Checkpoint quorum for height 2020644 (determined by block 2020633)

Public Key Last Uptime Proof Expiry Date UTC (Estimated)
0: afb246351ed7e9eadff997ae1ebcfcdd297bfabfc15398a8202ffcf1e3ceeb54 01:41:27 Staking Infinitely (N/A)
1: 0a23d89cbd41b85c5bffec0f53289536393e1a91a6537caf7b2064d97f92f7bb 19:47:54 Staking Infinitely (N/A)
2: 33ef2ff577821dfc3e8ba0b6a7b62759f092c53d798cc1a9c5ba85f59f549efc 00:38:13 Staking Infinitely (N/A)
3: 75ed97a747c6b790917a62befd733ec67df8a7b5a9861baa432521eaa788d2e2 11:28:12 Staking Infinitely (N/A)
4: 83b11eca71c4a2d77d256304fd422493ed4d290e3cb084bf76758d239fe9a0b4 01:02:31 Staking Infinitely (N/A)
5: 781efae048bb90829a0c7ce9f4c9c34e572d236955e91f4b3c86a85effa632d5 11:51:03 Staking Infinitely (N/A)
6: d3e9da49cf45266c3a0270253b0e2921dcbf939cfa52e5de31130d9ef5fb921d 23:32:36 Staking Infinitely (N/A)
7: 28f7c771d9cd63b4c3d5c8261c153f7e05f23f67a562dc5c39635445e1d1d268 00:40:28 Staking Infinitely (N/A)
8: b98ee2847b18dc4e46be8e384d59157a67a5366ee8b03553c519b520e147ef65 00:40:24 Staking Infinitely (N/A)
9: f9e9aa7608c8c134ff9c14ef92488c122b947fd27d8cfe31d6745546c462665b 00:51:14 Staking Infinitely (N/A)
10: af591de4390b7c96bab0312158a390b186bf4064e306538b51b5621bbc314185 09:28:18 Staking Infinitely (N/A)
11: c9839bdce086483c6fae8ede8600e4410c5dcd2a431148689480ddfd4c6c9363 04:26:32 Staking Infinitely (N/A)
12: 3cb0bba8f15c0902db46604f9fb6badeb0f611a645e4b29fb899342107c1f8c7 00:13:00 Staking Infinitely (N/A)
13: 3a695a55e9442573865950ec85b393e7ade3a76690b62d0e992f32f246943bd1 16:06:36 Staking Infinitely (N/A)
14: 81ea05da87ecfe7d707a13ded483e5a0ee257c3ff802cd01742185bc87d803d9 01:02:11 Staking Infinitely (N/A)
15: 45f9349a3ceee3a75d6142204286d37dacf81c1f9ec01a65e7b716269726635d 00:27:40 Staking Infinitely (N/A)
16: c338966f59c208f065e570e4631dced159118467b174e2cadc0bd59ff4768987 21:15:17 Staking Infinitely (N/A)
17: a382ea37422bc7715fb954fd567ae77c7b8db3bf92a2d4ac48025e0122832641 12:26:27 Staking Infinitely (N/A)
18: aa78babccc4e6e29d3becac648489e6da5c375ae22566dd9cc65880210d81539 00:28:20 Staking Infinitely (N/A)
19: e9ce4cbc023dd13600dd1b84e811838cccc09a169ab6cb51f537481242bddb1a 00:30:05 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
2020644 c11ae287ae5e36d178a5fef9d653d812ea036a404c06b68904dfbda6babc7fa5 2020644; 9/20 signatures: x x ✓ x ✓ x x ✓ ✓ ✓ x x x x ✓ ✓ x x ✓ ✓
2020640 ece802c53b5c49a872bde84ab4c8d9f9a240a49b11dc426103c5f0f6962f9c4f 2020640; 10/20 signatures: x ✓ x x ✓ ✓ ✓ x x x x ✓ x ✓ ✓ x x ✓ ✓ ✓
2020620 593399eecd3471edac80c838dc8e55ebbe7662888e45e299149085bbbafc4cfe 2020620; 11/20 signatures: ✓ ✓ ✓ x ✓ x x ✓ ✓ ✓ x x ✓ x x ✓ x x ✓ ✓
2020560 9f5a7e2436ac91820359813283ce0ec98544e2ac242d6f862fecebc34989cb37 2020560; 10/20 signatures: x ✓ ✓ ✓ ✓ x x x ✓ ✓ x ✓ x x x ✓ x ✓ x ✓
2020500 9c2d283deba56d16c3c9043b476ffabe4f86052a72853c915bab8aee87ef06eb 2020500; 11/20 signatures: ✓ ✓ 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