January 11, 2026 at 1:01:40 PM UTC Appchain Transaction Pool Autorefresh is OFF Go to stagenet explorer Go to testnet explorer Go to devnet explorer

2,021,670 420,238,787 v22 in 40 seconds 25,000 SESH 300kB/600kB 19.0GB

85,307,430.11 / 240,000,000 57,870,119.89 SESH

๐Ÿ Node Registration ๐Ÿšซ Node Deregistration ๐Ÿ”‘ Node Exit Request ๐Ÿ”“ Node Exit ๐Ÿงน Node Liquidation ๐ŸŽ Claim Rewards ๐Ÿ“œ Deploy Multicontrib. Contract ๐Ÿ“ฅ Set Multicontrib. Reserved Slots ๐Ÿงฎ Set Multicontrib. Fee ๐Ÿ“– Multicontrib. Open For Contrib. ๐Ÿชง Set Multcontrib. Keys ๐Ÿ–‹๏ธ Set Multicontrib. Finalize Flag ๐Ÿ“จ Multicontrib. Contrib. ๐Ÿ”œ Multicontrib. Finalized ๐Ÿ“€ Multicontrib. Filled โ™ป๏ธ Reset Multicontrib.

Arbitrum Events (Last 20 Events)

29,902

Prev
Current Page: 0/1495
Next
Showing events/page
L2 Height Type Action Transaction Hash Contract
420,239,318
๐Ÿ”‘ Node Stake Exit Request
0x7651.. requested exit on SN 2662 (bls: 0x1a7f.. 0x18ac..) 51d0c7c3e550eea025f1f7374fc9c8e426ca1d3b78cd4983238e19a4bb716b7f Session Node Rewards
420,238,942
๐Ÿ”‘ Node Stake Exit Request
0x7651.. requested exit on SN 2660 (bls: 0x7333.. 0x2c05..) 8dc9a821f38ff4adbd42a2fc220779fe85a1b12eb7b433ee85bd406fbe98cc35 Session Node Rewards
420,238,806
๐Ÿ”‘ Node Stake Exit Request
0x7651.. requested exit on SN 2583 (bls: 0x10c3.. 0x2589..) fa5e9f9c95b697e199974bc8a86527805fc8dcd4e1f2db23293cc618b1d72e5a Session Node Rewards
420,238,728
๐Ÿ”‘ Node Stake Exit Request
0x7651.. requested exit on SN 2582 (bls: 0x2e22.. 0x2019..) 88d2cfdf793b918398271cbbef77003300d164fa27dfc123355598961f7b4224 Session Node Rewards
420,220,298
๐ŸŽ Claim Rewards
0xDb38.. claimed 4.747088052 SESH 27596996df2e237234f18763a396a7da755d30bbcb168e239cc421093ebc4771 Session Node Rewards
420,218,643
๐ŸŽ Claim Rewards
0x20b9.. claimed 443.128067769 SESH 66b7951ec0a3c873dbdb38e81818b48ab690a85d2764666fced7d8f1f8658581 Session Node Rewards
420,207,351
๐ŸŽ Claim Rewards
0x900a.. claimed 0 SESH 9c3762b099994dc21d6fcb08be76c57e814668f77bbc3d048ba60711db7403b1 Session Node Rewards
420,207,189
๐ŸŽ Claim Rewards
0x900a.. claimed 7073.476118521 SESH 5a4b0907beba655653e099833b32cc329ea0170bdafe911be1a8c67fd3f52e9e Session Node Rewards
420,201,667
๐ŸŽ Claim Rewards
0x7080.. claimed 350.207360049 SESH e457ae3bd4eb5134fe04342b55b052e443c9f78d560415d54073e20d32c440b9 Session Node Rewards
420,200,370
๐Ÿ“€ Multicontributor Filled
Filled multicontrib contract 0x1D27.. 5fd341619f03eecc762f050b56d15e40abd74d6938b773f23596e2f03bdfb8eb
420,200,370
๐Ÿ“จ Multicontributor Contribution
0x3F7D.. contributed 152.928726192 SESH to multicontrib contract 0x1D27.. 5fd341619f03eecc762f050b56d15e40abd74d6938b773f23596e2f03bdfb8eb
420,200,370
๐Ÿ”œ Multicontributor Finalized
Finalized multicontrib contract 0x1D27.. 5fd341619f03eecc762f050b56d15e40abd74d6938b773f23596e2f03bdfb8eb
420,200,370
๐Ÿ Node Registration
New SN 0x81c6d4.. w/ ID 3612 and 6 contributors registered 5fd341619f03eecc762f050b56d15e40abd74d6938b773f23596e2f03bdfb8eb Session Node Rewards
420,194,534
๐ŸŽ Claim Rewards
0x2A3f.. claimed 0 SESH 58b1330bf767ef0484edcaf655a42a160486c9b0cf6789891609468da67c4e00 Session Node Rewards
420,194,490
๐ŸŽ Claim Rewards
0x2A3f.. claimed 30.74012311 SESH 25e90e4c095cd1a4cbed5396f51f3ace4f635b05a4595a67e6262354223391b0 Session Node Rewards
420,194,441
๐ŸŽ Claim Rewards
0xBBaf.. claimed 302.762845224 SESH c88f2e21861c74246a0d48ffd0614ecf507352c2b06ec7595b2eacd904bf653b Session Node Rewards
420,194,225
๐Ÿ“จ Multicontributor Contribution
0xB954.. contributed 2084 SESH to multicontrib contract 0xb7a6.. ea8a41287fee2c9352bebdc05b6161c1641b49059d44ba70a654a83a9ecbfd00
420,146,142
๐ŸŽ Claim Rewards
0x5F2f.. claimed 259.524726446 SESH 5778c7a57321c7802295b1e49cfc849e208c385edb2b95aaebc97f77e0fa0431 Session Node Rewards
420,145,949
๐ŸŽ Claim Rewards
0x5F2f.. claimed 0 SESH de7db39f600a3219eb795a5b8b2dc96ce110ae86f532b44b5cf10be90fb5eccf Session Node Rewards
420,131,399
๐ŸŽ Claim Rewards
0x35a7.. claimed 114.60438522 SESH 6391f5385d95bfd11514ad26c25ac1b5aabc9baab704f0c4d4e7403cd6a58bf3 Session Node Rewards
Prev
Current Page: 0/1495
Next
Showing events/page

๐Ÿ Node Registration ๐Ÿ‘ Recommission ๐Ÿ‘Ž Decommission ๐Ÿšซ Deregistration ๐Ÿ”จ Purge ๐Ÿ”“ Stake unlock ๐ŸŽ Block Reward ๐Ÿ“‹ IP Change Penalty ๐ŸŽซ Name Service Purchase ๐Ÿ’พ Name Service Update

Appchain Transaction Pool

2 transactions, 162B

Age [h:m:s] Type Transaction Hash Fee/Per kB In/Out TX Size
0:01:46 ๐Ÿ”‘ 1280237694e7a0522abbdbd73856c42ea525eac0227a32e59b548c3b9a854498 N/A 0/0 81B
0:01:46 ๐Ÿ”‘ 77397e9f9b5518bf86fc7e06f1cfe42bd766122e7cd53202b40abbe529f17258 N/A 0/0 81B

Appchain Transactions in Blocks 5226โ€“5239 ๐Ÿ”—Permanent link to this block range

(Min. / Median / Average / Max. weights of these blocks: 172B / 108kB / 111kB / 267kB)

Prev
Current Page: 144031/144404
Next
Showing blocks/page
Height Age [h:m:s] Size Type Transaction Hash Fee In/Out TX Size
5,239 2803d 17:19:26 203k 02dae9930dbc657da75a778d83081c8c5769d4503070f65be1ad8695ccdf1fcc 0/2 172
3b60a07c5c8d6c4dcb006bd21771bef8136e7042a3d8fe4c716fef2affda56a6 0.2736 1/2 13.4k
d3ebc2ab72759f1b4e6c489598254dd59a4a4e65bb66c75a5c7342e68558193b 0.2736 1/2 13.4k
5b6d807615fc5646d70b866bd827581c20f4331ca81a2be9921d3c90814dc6aa 0.2736 2/2 14.2k
7bcc7ce2044567de62fb72819133f73d3daf2774f5702cc9e60b92dd97b89229 0.2736 2/2 14.2k
cd441c57cd1810971f749b3f25178de0341ab3fcd34b6ce97fc5de65a83ba8fa 0.0684 1/2 13.4k
8e5e38597236e71a15d4aa3ba80d2955e18d8705d4cba108a5deac7ff42b1bb9 0.0684 1/2 13.4k
ac1f2f379b373e967a37d6c8782cc668a3c42ce16784223db19dc1e38086a895 0.0684 1/2 13.4k
3d04a49df6135fcf29e5b6bfe1eebfc2150a41d84bda18f29a2accb96c032014 0.0684 1/2 13.4k
2e427dd578faabb88d2c423d05bce7ae0d01cbe144f753cff9f51b07fd74403c 0.2638 55/2 54.5k
1a1b2de8adbeb295edaeef544319f6772bf7b2ac90b2cf81ce92a844c5c66f07 0.1856 1/6 38.6k
5,238 2803d 17:26:59 212k 929d03436cafb2f7fb85f78fed8b3e675f5eb3589cf6f63e8ef3796061388266 0/2 163
d9ebb7e3aa6de3db51f74db04bb92c4710f5db7db0894635658c03a7e927a7bc 0.0684 1/2 13.4k
b7e2ab8c0d3a0a82e46c79403a6b1466324e6d0edf453312504b2f72bcfcda9c 0.0684 1/2 13.4k
9f6f08b653a08c2fe65d6c782b889efb67bc3a3fe1d21542dbdfe4a3d6339430 0.0684 1/2 13.4k
ca9bb13391da2763a09b4c342a0c109d68d56ef75c7ec19c8f22ffd65ec8b752 0.0684 1/2 13.4k
eb09dee209754d9a0a1bf2e7cfc787502128dc5fb4ef1db8082c8f42ecb82158 0.0684 1/2 13.4k
13f9ba56eb27e6cf91bceb7f6daba923025302a5a837b605e1cfd7a15fead88d 0.0684 1/2 13.4k
d7ef4b9721f5ad34463f643a588366e8f7f87c8ca8c42beb63a08ae41a212fa2 0.0684 1/2 13.4k
183d09a7047a136d1dea2d99cd64f21215d07b5c172ad0c337f80916e10269c9 0.0684 1/2 13.4k
b1995635f9af1481af1b9c0140171b5a1ff8e3f8775ed8ca8229091e415f35d3 0.0684 2/2 14.2k
61a374fcd0f207175972d7ea2c170099aafe382690010cee292ffba8b8940615 0.4299 2/14 89.8k
5,237 2803d 17:27:35 95.1k b6605a6fc9c3e54576412f69d221239feb8b76b80112c1dd5c3d718fdf049af0 0/2 172
814e379f0555250e389e7851bec69bf48044b17153efe83da7d725c09437bf69 0.0684 1/2 13.4k
f45c76ccf9c28bb25043bc43d323ff428ea114edba5d41b3f9873c91f1aa388d 0.0684 1/2 13.4k
5af0ac7ea8fba4575689d2bc3f5991e8ef3309f7dc990013d41d546a25f76e8e 0.0684 1/2 13.4k
04d081551a4c434c08588598d45b98bd376182d08b3c152da06999edcc8f7f8b 0.0684 1/2 13.4k
22b96c59920f012649f8429478cf7584a37d91cd618798a1d752876e6eafed1a 0.0684 1/2 13.4k
b39992df7d5b5193d799606b5b8823a72b15b531f5482be93ceefda7c0b26f5f 0.0684 1/2 13.4k
8ecce5c730cad70b614742ebc887f424406e5138871b417f490300711ac80628 0.0684 2/2 14.2k
5,236 2803d 17:29:00 13.8k a55918b19cb52cc59de86e849d6921d162fe62d12fb726c2bd67a2ccbfbc1751 0/2 163
07872edb873cb698bbe2ca6626acda58499f60c79e8b4af87740c8abeed2b61d 0.0684 1/2 13.4k
5,235 2803d 17:30:32 122k f7c678a556484e31d723f785b7c6e995526e7067143741c9cbd72a659229fb06 0/2 172
7eb7fe58c249734f3218795425936b23f56aa55d131545a4b47e5788da9754f0 0.0684 1/2 13.4k
61d197e23ab5c4fedeace3b80b74081988916b706fc331e2cf5b2a93e6eaf61a 0.0684 1/2 13.4k
3e86d301b6f96c30b8d4d91bfd59d3cae8a40366d84bb854b71e0b07d0b6d9be 0.0684 1/2 13.4k
9aadb919fd70cad716ef56de8e5372d19c7629e54e7ba580ff91added8e7e944 0.0684 1/2 13.4k
d480765bcea0d86bdc36a408f80869b1e90fcfcbbc4b22d306c75022de226c3d 0.0684 1/2 13.4k
2cd817555f68feb76343808ab57e21cb33356228b4293123ce9578ce189179f4 0.0684 1/2 13.4k
7fd0a401bb3de75ce0a56a649166998b163d4c8ee244771fd72f76fc7a5a4b0d 0.0684 1/2 13.4k
1736046dd7cbaf6e5e79c5dce58ec14b75bb8d9c0764f901884b8086c0e6757a 0.0684 1/2 13.4k
088a53f0a9ad7c5b29fa3a32f2d275fafa5f940b02c8133b9a556bf5c32a7262 0.0684 2/2 14.2k
5,234 2803d 17:31:48 213k b08a6589d71c6fc89f3a11939906ebc3c5f2ba40eaf51d1b0d6682e96b44017f 0/2 172
34d020e8d6a1ca1314f0688075f3cdefc0169d892ba545e9cd988a996e7f38cc 0.2736 1/2 13.4k
1533c1647e6fa3ca5b762c72e705bc7c5fd78a1506bb8c02c5f02e93209c306b 0.3908 1/3 19.7k
3ae67e3cb36c00fc2e3a689611a1ad132d6bf3451c791add1f6a029d10f7d5aa 0.0684 2/2 14.2k
7dbd40e645e6c7e5e026aabde02f151994b660493814d2911a4724a46fffbb76 0.7914 2/26 166k
5,233 2803d 17:36:31 259k 8c5d251ed3064f72897a19c6c7c7126c0e336729d0dc7ea88958727e6326e755 0/2 172
7175a0f50ab340d62090a2f1da85c33bf116d180c0b388e3715f962651c849d4 0.0684 1/2 13.4k
418bb64ca9651b0f86ad9e794720154ac97d894667ec577d1bdef1b1d34564ea 0.0684 1/2 13.4k
059c769c03f61caebfd67c35976362aa55a6207939cbcd2b4df83759ce258aef 0.0684 1/2 13.4k
ddd59a429d0a4072494b9ffc5a15e5873d05431f3fbdd3adccb3ebf1f0d80405 0.0684 1/2 13.4k
6405216dd2d822be2b7524879a5b242281cc11312abc774a5f0e82bf953e44fd 0.0684 1/2 13.4k
09d6b88513846193ed8483359f91dbbc60001af9b91012e4bd7ed59278a4de65 0.0684 1/2 13.4k
697a3fcb337fa8615bd8c3d4641e7d325acd32ceacdd6b94f48feb49d3e937a9 0.0684 1/2 13.4k
a11166f316f3f62083d528fdbef619ea84516be92bac37c7f64afe628ea97871 0.0684 1/2 13.4k
af0b159bc3cbaf045ee2b0f7cb375522b8bf1097d6b29797214df6c8138f74db 0.0684 1/2 13.4k
eb28a03074013a09c4ea62036f1086cb5b4ec79848b8b6a52f4b925400825621 0.0684 1/2 13.4k
69c802ee92474e37e81e9b99341a9143578f8ef97c3f766cfcea5ca5673e2948 0.0684 1/2 13.4k
285d8bb71f633681d268feda25055de437fabcd133d7f10c4e76be7954d81de4 0.0684 1/2 13.4k
fc5d6136b67986e971f28ed8cefaff92de10b2496044f157c8db0a507388cd36 0.0684 1/2 13.4k
8d8fb933b0e06b1339af4e80eb14a73dc6be4fd247207d12f95dc0f414878413 0.0684 1/2 13.4k
2d5b9f5422627ae5cd46b6f97c3360fba8dc6fda5ee999d2a66ea5cdfb648ba6 0.0684 2/2 14.2k
f9bf68c28289e5d4e101a5ccceb369a4e5a1911996f8e40a7fb81ddfe340b5c3 0.0684 2/2 14.2k
e49d82fa31fa47a4e791991a8c53bede594c2f4b83ffde6315d78c23af1b3085 0.0684 2/2 14.2k
02d87c25390b868e0034fc41dfde53573f255b7dd70ad28deed641910b1e554a 0.0684 2/2 14.2k
76af17e1562bb34771f37bc3261544dd43cca97287ae081d4315d6666cb65226 0.0684 2/2 14.2k
5,232 2803d 17:38:48 19.9k 0e2a588b33bfad5f2fe3b89887f1acbbd410c192ac719d63a4a5847eaa0672eb 0/2 172
6f85daf36a961c5ca3ad36241bff4249b4533905b5c81842c173e794c84e0dbd 0.0977 9/2 19.5k
5,231 2803d 17:39:04 388 dcc41c63e63a29fc3f47c7875a073c7de1015b70689857ae90f65584d9d2c6ad 0/2 172
5,230 2803d 17:40:02 124k dc19ca391b41ab50f9bedfe5fb7a252720cf57c2ea04c0a5bc0a4b5d3c8877e9 0/2 163
52f51a467954bd138e3990ac1a9ee159eb2c2f03698c55826525f25cf0abe507 0.3420 2/11 71.3k
629ad943d66e30f1b1bfb264a47d2bb11a856ef8be9dfb8c4c1e1bced064ebd0 0.2491 2/8 52.0k
5,229 2803d 17:43:11 388 be02545a5ed3f30828b1abcb294e38ce263ffc02d2aef9e8905d7840ddb2f7e7 0/2 172
5,228 2803d 17:43:15 15.4k be8d4b9d569507ee468d42a3ff65a896a8f653f399346bf0c0a3a674321b759e 0/2 172
2282745169b7bb2028bd696a4951f3d509511cc689865b3b017054800589d8e8 0.0733 3/2 14.9k
5,227 2803d 17:44:55 13.8k 8105bbd47a36728eda7f2b7b515fcdff2f74a0b1b09889e8bf1502bf8ade970f 0/2 172
61c97d9404f46805edfa463b93301f6c89a40a6f7bee6ab72e45f77200c8541a 0.0684 1/2 13.4k
5,226 2803d 17:45:24 268k ec80de8419e58d1da798cb06002338fdb1b18fd46dc16af1712d289b42f7c6ea 0/2 172
561d86c719fd52fbd68ad813e419387d1a06b7c33c7c03ab053a18ebd7428a14 0.2736 1/2 13.4k
7cb6cc61daf104cbe748c54c3c1379ba14c5af4d292e97326bb4039fece5c0a5 0.2736 1/2 13.4k
30325c214f2b2193a5662ffdccc04bf767db08fe84c08df64693791f7652c47c 0.0684 1/2 13.4k
e8fc5a05888a49ce6f662482d05397d5a33e1cff7841785024867384d65e5ee5 0.0684 1/2 13.4k
cc419a7f2e6005046ad5ec9a4e089cf15571599362a278609724314ec2a5cba4 0.0684 2/2 14.2k
8c69fae6dd5ea929b3a696ee1d181bfe0a29845c6766924e401790f561877a00 0.0684 2/2 14.2k
47261b0476c8e7614a73d8aea96e83637637a819dea79986be52a7a982daa0f5 0.0684 2/2 14.2k
9cb022ab6ce10ebe7bdfce13e78cb5687d9f62003443f2416e6e927b4a40c25d 0.8207 1/27 171k
Prev
Current Page: 144031/144404
Next
Showing blocks/page

Session Nodes

26 session nodes awaiting contributions, 8 decommissioned session nodes, and 1471 active session nodes.

Inactive/Decommissioned Session Nodes (8)

These session 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.
754c3d80f407db59656f895fee6092c477589b65d07468e1c653886cdba5a542 2/10 24.8 2020577 1d 14:34:40 348 (in 11.6 hours)
1a855224581cb9634cedc0c1dad96141234a989788d9e2d7dfe3a10908960df3 2/10 25 2020578 1d 14:33:57 349 (in 11.6 hours)
3aea158387f81dec94ef9ce47c16333bd2061d15eb72a5edc57692ad084fc4e9 2/10 24.8 2020598 1d 14:34:33 369 (in 12.3 hours)
f18373cba32a1e33b569623f94161d7f9a9c666ad6723fa59aab8a72d5b5d0e8 2/10 20 2020996 1d 0:37:40 767 (in 25.6 hours)
915f066e9424e92663cb2fdcc9086bb028b0367bd6c8807a569ade237bd91da5 2/10 25 2020998 1d 0:35:30 769 (in 25.6 hours)
75077cf371cc6b0844e10b4e3442b19171a86866a7590cd338563b6868b5f578 2/10 22.9 2020998 1d 0:31:29 769 (in 25.6 hours)
5e1fe3e00d1b4834922c0ddc97b8fbffffa52bfd16286432c062b9b007528788 2/10 20 2021007 1d 0:25:06 778 (in 25.9 hours)
982f54b09c8a817489c0b9a68a023182415a4d0a14a4beeabae54be8b10c8d80 2/10 21.99 2021015 1d 0:26:08 786 (in 26.2 hours)

Active Session Nodes (1471)

Current storage swarm count: 265

Public Key Contri­butors Operator Fee (%) Staking Requirement Last Reward Height Last Uptime Proof Expiry Date UTC (Estimated)
e34245544f2dd7b0ad4c9e2b3fe31a2d614b4342f7af02218644bd193bbfbfe2 2/10 30 25000 2020202 0:47:39 Staking Infinitely
887e42dd8254412253ad32a24264a23f8e4049d94c0cc320e394c9c3588a73dd 1/10 25000 2020203 0:39:19 Staking Infinitely
1e4d90d3520964828ff03617f0bef200c2d6704ddcfa33556454a7da75c0a6c6 2/10 48 25000 2020204 0:49:56 Staking Infinitely
634bd4b5b520e17a9a616e2edc2c6d09fc87a1668d646b045b6933429961ce3c 1/10 25000 2020205 0:43:40 Staking Infinitely
71f50ce7206019e8f81528d52d20df28c5a18097637d1844d6249b15146a2865 1/10 25000 2020206 0:05:19 ๐Ÿ”“ 1/15/26, 10:33 AM (in 3.9 days)
a64f4e45218281c8a0e3c910b0d503ea2af1ca5277e0ec34915be060d4bb3f64 1/10 25000 2020207 0:34:16 Staking Infinitely
68bfd9c95e854e195d1ecf227514ef754ac4dcfc1a87150fb51e769789023f89 1/10 25000 2020208 0:34:06 Staking Infinitely
191c854219fba4405c244c7c750fff910f6ce669b0e72c444b8912a29cac1806 1/10 25000 2020209 0:34:25 Staking Infinitely
c273254c2a9bfb3cb2adc9d616400fd792b366810a468e3fa4c3adba766c0acf 1/10 25000 2020210 0:27:08 Staking Infinitely
56dbd878d0e82730967ac7aba31f56debb3e30179888a4b21cb647d4a4d46793 1/10 25000 2020211 0:14:26 Staking Infinitely
+ 1461 more โ†ช

Click here to see the full session node list (at most 10 are shown here)

Last 3 Appchain checkpoints

Height Block hash Checkpoint Quorum
2021668 78dcabeba7367c39f7610da82d390dd05c7a872131b7ba7f3279b0fdc8685659 20/20 signatures: โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“
2021664 e1eba4d77eede24f9fae8e91969c889123cd2a8cc31fa028ef1e26d81d940f09 20/20 signatures: โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“
2021660 6f459cfe411055338511d39526c60a4013c7062671d56c74c9efe394a154de88 20/20 signatures: โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“ โœ“

View recent stored testing/checkpoint/blink/pulse quorums