10 September 2025 at 4:26:22 am UTC Transaction Pool Autorefresh is OFF Connect via Lokinet Go to stagenet explorer Go to testnet explorer (via Lokinet) Go to devnet explorer (via Lokinet)

1932852 377560387 v22 now 25000 SENT 0.005 OXEN/output + 0.000122 OXEN/kB 0.015 OXEN/output + 0.000366 OXEN/kB 300kB/600kB 19.4GB

: 72787124.829288483 OXEN 73550099.600870982 OXEN 81209.871557533 OXEN 762974.771582493 OXEN 37113732.233787097 SENT

* — The circulating supply may exclude any currently publicised locked OXEN; otherwise it is equal to the coinbase minus the number of burned coins. Fees include paid transaction fees minus any portion that was burned.

🏁 Session Node Registration ⚑ Contribution 👍 Recommission 👎 Decommission 🚫 Deregistration 📋 IP Change Penalty 🔓 Stake Unlock 🎫 Oxen Name System Purchase 💾 ONS Update

Transaction Pool

0 transactions, 0B

Age [h:m:s] Type Transaction Hash Fee/Per kB In/Out TX Size

Transactions in Blocks 4416–4430 🔗

(Min. / Median / Average / Max. weights of these blocks: 172B / 145kB / 159kB / 316kB)

Prev
Current Page: 128561/128856
Next
Showing blocks/page
Height Age [h:m:s] Size Type Transaction Hash Fee Rewards In/Out TX Size
4430 2681d 11:49:58 116k 5457800762481523ac1e00fc428f43a40dc3d7e8eeb90c2df943e3585e620a8c 122.78 0/2 163
5c36a2c7f01a7addd1d6c2fb540890ca1e46e09f322d9424e5d56684222a7e30 0.0782 4/2 15.7k
99942900cb2888cc3d0ee4f59fc8782e69d2f7cb559ef77c0463f576de4a98e6 0.0684 2/2 14.2k
6e16c2aa53958daa9fd4781da345d633953254180622c1915e7264ec8dd05e5b 0.0684 2/2 14.2k
3b2ac2207376bf8fc2b918075ffce614271609b72b0c6302e3bbab4ce6f5f4dd 0.0684 2/2 14.2k
bc7de29503a9fa12f5b3d4259113d285f6fae9922c896c6b0ec9b34109060e90 0.0684 2/2 14.2k
310a499ec372d255e13826098c40f24a32e80c70c47b3f0cf2856172c3077068 0.0684 2/2 14.2k
ffa11643cc03cb1e7fb64357edf9d464121fa3d8c393c5da3ac5c7f69631aeb7 0.0684 2/2 14.2k
fcd510eae3dab61a6a2b8c0563f67f2babeeeca4ca72516a1b21a8e20faa23bd 0.0684 2/2 14.2k
4429 2681d 11:51:29 109k 98f0371056ea8d45a13c8d88857c12f4251e3fac29d7417844de61bcb83b028b 122.98 0/2 163
06d5958233087bb6404f282a6fc626082bc4ae572abac6d5d7c81a2c7aa70e39 0.2738 1/2 13.4k
6bc434cbc7b709efd2183cbdc4684f4ae04f489de2f9a9203620f98185879c85 0.0684 1/2 13.4k
ed4820801b7642cc4a3866ce8990f415fc7d90873c4910b2584ea9363e77370c 0.0684 1/2 13.4k
890be8f3c595bfba2eae8aa84000d540c9b876217a56e1d3cd01eae262cfd8fd 0.0684 1/2 13.4k
80d0279a63f795510bc02299ceb6fa7b770b6f068420663dde5bc4e8396fd8a0 0.0684 1/2 13.4k
0ee2916a3118627ac755a95f05643400a472f062c9bf2a878b9422c82d4ac9bf 0.0684 1/2 13.4k
5f483272a4e62a74dd54f5ca1594a8e5e72a1060466258d5d3a4c10ef6029b7b 0.0684 2/2 14.2k
8a57c83fd078c582e7bf205e87b5c61d4e1f61175b2e269cf5097ef996ceb6a8 0.0684 2/2 14.2k
4428 2681d 11:52:22 212k cdcc948947be2c27549c03e6de931fb6ea0325610059069ab0e290081e15a0bb 123.24 0/2 172
5d69226a8a138d21ce480d06bea3a2f197c06ab62e8d49edbc2fe39edb11eb60 0.5818 2/19 121k
076f6a4a2b09e634ffe3e944655779800b87dece4f8a46dc042670fb06203119 0.4302 2/14 89.8k
4427 2681d 11:53:11 264k c07c4f0b051b7896a47a9ccf0bf8f6b8ed9246c5622ff5d1f291e0c731acc437 123.73 0/2 172
19f2998f2eee0b040ef2bb18d4e6285e398c4b5c623a4066dfa8fe6c80eea564 0.2738 2/2 14.2k
7d18045d06103e6c218969d9df090d84c1b84de905771c026e33612231e0d7e6 0.0684 1/2 13.4k
c65bd2748925fd0f882b2a758b9278a3ff37b696bba775fa743bedb5316187ff 0.0684 1/2 13.4k
14185f0fe534fdd06a06e338461409676afeafdad08f3d883b8fd8b51a969fa9 0.0684 1/2 13.4k
3b91780b87ef35e5f168b5ff3d515a3bfe4b6202be1ffeb6e5f1495bb44918fe 0.0684 1/2 13.4k
0c6b1885f065eb9648ed536e9718455e2b642e946dfcf7a2d772f98f8fc3a802 0.0684 1/2 13.4k
de5e09c114f47ee0585f3cc2b8d0acd7cbd9faae28c3cccf83c52683237636ed 0.0684 1/2 13.4k
fef0ce281459d820e952e6acac156d64b4230ec3a70f7537d9e84dc2941bffd9 0.0684 1/2 13.4k
766bd204af9182a359cdc5444fca15bf3774596b1a31e3cf2781adad3b8b5814 0.0684 1/2 13.4k
76afced98c6588f9c169f970422609d2fd2b186d0d631ec739b2c1ef55f026ad 0.0684 2/2 14.2k
6cb075d9dac91fa41819f63eb1dbc57d53c4a62dfe560027201ff3c7e15589b2 0.0684 2/2 14.2k
6ca62c1123e80f05add3ac94f9c08324f96a267f746ca10141dc3a6448124e76 0.0684 2/2 14.2k
dc1a13016922f1b15714a2f5c03eb81d5e59421f87cce5804ea4a55b604f0848 0.0684 2/2 14.2k
9c708ccb07d01456cf8440f69d4909aecaedef3292d4ebd7a33d1a71916983bd 0.0684 2/2 14.2k
b982a4316b327325f594a447c5c88a3670bbe05e35d77edf68e2804c0fdf4c3b 0.0684 2/2 14.2k
0c20b57e7d87254c1e9d71068045a67dd81150205202799e868927c219f35c3f 0.0684 2/2 14.2k
d4c1c506bad0d6788d6bc694cef1c3b8063adbac0d75425633b36df1337939b6 0.0684 2/2 14.2k
595c1d159b6198daa5464363930a0b3efd14457a76fc8c2e6096f9fe3963ab54 0.0684 2/2 14.2k
82e6aab4c783a1a03fdb981e84c16b8bb0d5467afbf68a01bd82bc3aeea73370 0.0684 2/2 14.2k
4426 2681d 11:54:53 388 85c62ddfe3793e669ee36a0fd5cf8792b07711e05b4e1d868b5eef4a55d35122 122.23 0/2 172
4425 2681d 11:54:58 44.6k 8b370d5f2fc8d8a01762c04db1843fd5b2bc9da0e5ddc0acc99ae72878b1bd71 122.68 0/2 172
93cd525d7243fb7e4f362935220269026857bc6388c47619c3ed354e22158156 0.3129 4/2 15.7k
eb8b3e0999c9a92c37a034bd5a690e55ae5a55b8b2fcd08b7fb631f54550cb5b 0.0684 2/2 14.2k
ef23e7fb356d2b967a096b85c60d29e6f4067ac3ab511f8dd921f3ca384ccc1c 0.0684 2/2 14.2k
4424 2681d 11:55:18 43.1k d4cb0248cb6afc3468d711937f053ac2a0b73bb37cac75c13468d642524b1f7c 122.43 0/2 163
04fff933501b7b225ba545e54b9d954aa24d024577ff0301c5188d9c5c3e3cc0 0.0684 2/2 14.2k
a42fa93c35ebd36b7ccfb83d45b7319c2b1aca149b370a5a003997121c6d6150 0.0684 2/2 14.2k
0facaa121abf2f3d351641f34cc3f828cdda80c1603c978e55740cac1571190e 0.0684 2/2 14.2k
4423 2681d 11:56:06 100k 7c2f2aca5b1804924695618d8a811fcc9c1cda8821b20086c6206f1d918d8d54 122.70 0/2 163
4803d6bf402fcd7561802288f5c80e1ab2a7050aa7fa9b21336f9d7726d9d3c7 0.0684 2/2 14.2k
0e8e7d083d8e108d0b2315bfa95b1314909ff0fc0e773c0624bd137e025a460b 0.0684 2/2 14.2k
121cb91518795faa98de53b098e66b21bdf541d8e4856f715cc253a40a3305c9 0.0684 2/2 14.2k
02e49028faf8e3c68f6dfc818ee1514e572b5c59fbaacd34642440fc0be1f2f3 0.0684 2/2 14.2k
bc29517f950a85436d525d7b8e5645b22c7f127c4a9dedccbe228ace3f04b132 0.0684 2/2 14.2k
55f093935b0ad278addb59a4bca83ed38e4e9b7debb9461a3495ab98a103f328 0.0684 2/2 14.2k
eec93ace18819c4ea4a980a0222d2149ac5d9e9fd95a89b73ded0a2e49e82f2e 0.0684 2/2 14.2k
4422 2681d 11:57:57 62.8k b69c8a0978128ee0d691ef519f65a7b5ea69044a51b634f55c1b39d960114b55 122.53 0/2 172
e012fd6807a550e0d28d7554b4df7d019ddbf0f5c5333f6f6a068a54c83cc4ff 0.0978 1/3 19.7k
247515164a80be0a89794aea01f4af454ff9c654410401d2c18f8481fe98b966 0.0684 2/2 14.2k
3cb25d89cf5651fea468aef1fcca5136fdfcae3b92ebed5e899a7347c9721aa2 0.0684 2/2 14.2k
aee3f05185270d94d3f24715239105748ee81a0eec2c8ac4f288d0bac0e773b7 0.0684 2/2 14.2k
4421 2681d 11:58:41 146k bb24442a6ff0327f92a585bff01667971f2e522c6443b60a96e25f0a9d44a9d5 123.48 0/2 163
16d384fc8f2b53ec4a25ffb8d90f206c0dffe5e1ad56101863249fcf94e8da8b 0.4107 11/2 21.0k
5399a8e899303f7c81828f6768b189a66839eed612ed6e98ffec7b73c525f816 0.3325 6/2 17.2k
0db436bef996baad52f1b85019afc8bf0442a35b911082e3d853b0c7228fe9d2 0.0684 2/2 14.2k
3855efa0f7d34382916b7686373347f3e9b089db138467a0fac4d360727bbfe5 0.0684 2/2 14.2k
da024d34998660c695a71a55667fe8a9666a760d99afc3cfd292bc200b34c80d 0.0684 2/2 14.2k
70f3ed5ab18cdf5bde6cbb4424848b71bccf4a5b71e3492678c2f5db7300aa7a 0.0684 2/2 14.2k
4d54f19d98637ddd1f8a3f9c4a3664df5f0b8077043d1da73708772200a77d99 0.2396 49/2 49.9k
4420 2681d 12:00:50 179k e2c902fe7cbed6a2b64b1a6220d9c6fa798a2e819b75148628bea78c028475b6 123.52 0/2 172
7ab93f9d22d9dbd4d9436145311f47d2570c2b2646e27ffbb0703b43dcd6fa1f 0.2933 3/2 14.9k
7c6300d5a8cf9eaf8ed52b0ba4947a1ba6a7f4b691f7d142dfc3f3bc1899890d 0.2738 2/2 14.2k
afa61c454838164694492ddf0b22b0da54a7e0240c94835de3ccb18e5aa3e180 0.0684 1/2 13.4k
c7f8470b6a0290dd2629a0eff94bd3cfc29f8cca779e0fc164707e21cbd125c7 0.0684 1/2 13.4k
445448f0386765b7b422cc7c81bfc62d6e73cd6e8335eaaa779b8af8db7c9e01 0.0684 2/2 14.2k
317ac3b09d52450078b6e63ee778e5ff5e4c4ae6c28184f45c9390b659c3092f 0.5231 2/17 109k
4419 2681d 12:04:39 259k d89f8c6dbc2d9ed75e874275dffcdfce30840599059702574c1938c471d31fbd 123.96 0/2 172
768e0bea07ad49843e06ae95412a185ad371c25107f32d5e3db5acbd6202e7e2 0.3520 7/2 18.0k
a42eb3400511e2a0d6e29567141640d4095cbb3cbb606f3b7ae2e8b67b559752 0.2738 2/2 14.2k
99a64856f7ccb998eac915e3eb16b297f7eb90c299a07bb6477a621920f8c35a 0.0684 1/2 13.4k
b08a3febe8d6e8812c8d7c0f05bbd641959163aa9930a170cd0fe2f2811b9410 0.0684 1/2 13.4k
faf38761af2bd0e2e208c107ddf0711fde0adc717e7dde2d51496a8a00c76244 0.0684 1/2 13.4k
ea534b1f5b848251d3f3cddca82e68b6b050f770a37250c63dc748a7813c74d4 0.0684 1/2 13.4k
36ab3f06af909dfd2a274621a11b4d9c0d0c7a07671830c0bd84e9fd53df964f 0.0782 4/2 15.7k
0a38c3a3beba7ddd447b8f3fddba8690021b727bcf56678ad18aa3557b014c99 0.0929 8/2 18.7k
5765971dfbdb43699d0dd6004e612c9b1622acf1bad5b23a17e044a60efd097d 0.1564 1/5 32.3k
19f962a119e895b5324a69d4df81a872161f1d2b179d5258e38364d1b0eba27d 0.0684 2/2 14.2k
f65de72037ec9929f6ad6c38da019bdd4388369463c18941685e93b1a98d297f 0.0684 2/2 14.2k
01a589aa20076442f888d2815198b7611d022789d8c636ec1a19a566b61b7d51 0.0978 10/2 20.3k
741b6d498964cc9c0a32d4f94602e4b78454890302a3b9ceadbedb461d4ad155 0.0684 2/2 14.2k
f4a3bc101f49eebcd5d96b50536a259a07fa152b944f1c34c5ca03f7ccf49e9a 0.0684 2/2 14.2k
65ed787d1c738b2bef2bceafd9eb3921f393bc7d75b590b4a7ff61f9161df306 0.0684 2/2 14.2k
8162b27eb870848833f24880360be87c917116a0d74f3798cefdc0daae5c0c15 0.0684 2/2 14.2k
4418 2681d 12:09:41 316k 7e0bb457b7a8e1cff565dff16ce5cc099472d5091488842277b5924c92701d78 123.40 0/2 172
66671a9303edddf16fb8a88c924ec2e857fd09a85a207aec2ec4f27742d41eed 0.0684 1/2 13.4k
364c061a341fea1cc92937e9ba9ffe3ac72651eec9c9307ddf2c62a1b6cdda5d 0.1027 11/2 21.0k
f719a9a3d720ef8074d6a0ba5a1d49938f12c1710d922c1033c24815498f8703 0.7920 2/26 166k
0f091acc6b49e7bc568c7544b2546a9b6743f9c736ede7b47ee559c315cc7afd 0.5525 2/18 116k
4417 2681d 12:11:05 245k 6fceb02291c0f65f019f53f5a09487671585ac7b2f01f760ddd5e621a25da31c 123.83 0/2 172
70715bd6e71869105fbcfa394420d05df9191351dc175f509c74fa8b3f1dc019 0.2738 1/2 13.4k
2eaaf1c6ac96ad0def066ddf2c5a6fef94fdc3469dfd17a13d52325b77be0d38 0.2738 2/2 14.2k
0f10db0d152dd67c8af3c284cc2b41c4b1e8e1d4ab8be403b641bc75510d9385 0.0684 1/2 13.4k
77eab0d3702ab5103815d206c27d41b50774f1e69171299c791268f0589232ff 0.0684 1/2 13.4k
6aa6bd991344aea6754a3de9d5832940dcd23d1086c269d6b71f5e945f8a645a 0.0684 1/2 13.4k
3c353cc7b16721aebdcd958dfbc06f8852b6a8b0d2a20f8760c0eb9f9e963207 0.0684 1/2 13.4k
149f112b9be5bacdf344553179c94f60f3cc0a8e4bf8d76f6c1a84b6a064e9af 0.0978 1/3 19.7k
ec4de0f19440c7d95a653921e2f1bb5346990cc2586232e169df642b4b8e091c 0.0684 2/2 14.2k
11967a3f65ed2ba134185b62410cce0c26b0152dba3f4e7f11be62b7b8f0637c 0.0684 2/2 14.2k
7319c935bebbb95f6426e284a15c37007b6839de3381695e85e8dbfc607a1f39 0.0684 2/2 14.2k
7a26d885b4b0ba8da1148903226b80aa12fe4e5f9280f53197484218da534f52 0.0684 2/2 14.2k
e58c56da5a91ffe14fc71d63363cd7ff67f58578f72bf536552ba57c722dc943 0.0684 2/2 14.2k
388cb52a32c022f31fa28daf11e35a2b961b30b6c85f487a0fd9e6d66d180446 0.0684 2/2 14.2k
b522955921a0cd95573013ed21f8f3dc1d2550ba14b0d3393ab8555ba88b3f62 0.2787 2/9 58.3k
4416 2681d 12:16:30 297k 75af7e25a2b657f2bb4f32ff7f5eda5a06ae15a98f40434ce733126823026d20 123.94 0/2 172
4704eb2224f22943e8d69f160b7c11730427895ed55b3c86fe1a76e0ebf1f9a2 0.2738 2/2 14.2k
819be5e24097355f63b8cf0f911677e048f6a90d48531c39ea18dc726de8a7b0 0.0684 1/2 13.4k
375d5e20e0d827e1d982190e909eb519c7605144968eaea8ec9c31b1ff2bab53 0.0684 1/2 13.4k
59f3fa0c2b55b50806ca0040ab66df990ae215257a2d406d575bf895b4c21d65 0.0684 1/2 13.4k
3428160fc6ce71198ddfd3d4c4be2e9d7a5e4f24da4accf6f603125f909e24dd 0.0684 1/2 13.4k
1bada1f66dd1a2254d2b8336a8a38b1d60fef045bcca213c5ac62b1d6a36e5df 0.0684 1/2 13.4k
6e51885365dc7a4d4f5c7deaa23c1dcf5d66e4742e1eaf7254f679ecd3a1fed8 0.0684 1/2 13.4k
8fc49c25842635d4268c56ee572c1ee5e334d23f4b434e5b7466c4f2909bd486 0.0684 1/2 13.4k
6c63bdf88645ee1b097bfe8258c97b1e5ef54ca55f846f473c9aaacf7cb6aac6 0.0684 1/2 13.4k
d556b5744d7cd151835a1ff563932dfaaec9b5816d2d99d4f8154af0143d49a3 0.0684 1/2 13.4k
3656da1f8604a636cb8da689b04ad57e4f3098cb810ccba1f373d0fc88fa8c2d 0.0684 1/2 13.4k
b3348259a5ef7e274ba87ea0c5ed57e614e62c9932e3433656b29f53f93b7a8c 0.0684 1/2 13.4k
879fe14e60adaaa3551a2b944cfe3a5eee509011e93fbd44517d7a2314ec6ebc 0.0684 1/2 13.4k
2bfa58ef3e02f19e2ce94b335ee76015b09040ef634877a46720e7aac5205842 0.0684 1/2 13.4k
cf3dfa274515a8b7fbb7ecaa4980d4dbb473453cfa67bd667d1c95281ba9ed48 0.0684 1/2 13.4k
97393c7dcffc1f40b6b53a21f5e349bd1b410364ae6ae85f4b5bb6937f733a5e 0.0684 1/2 13.4k
06c04d9e3f7cad188792845d63cd3647212334dc7e76746711b8d65bd8fceebf 0.0684 1/2 13.4k
2c71de3341e0144caab818516f306cfef735e17f87e64efd4b554749d755cdb4 0.0684 1/2 13.4k
2a205c1ac52038083a5df244bc292308ff09c6641fb005e9001f1e87067ffd43 0.0684 1/2 13.4k
7a9de571c491469bb70f35e7cb3a5659988462b087a31a53f4bea6925a99f539 0.0684 1/2 13.4k
4b6cb8ee6bd221544ca18167151d7fc99beeca66e5c6c0aba233f5538ef35ffd 0.0684 1/2 13.4k
d5cc4c5b194733668075f013b2e00c90b19188ed5b6816cfc6c48e58e827bd13 0.0684 1/2 13.4k
Prev
Current Page: 128561/128856
Next
Showing blocks/page

Session Nodes

0 session nodes awaiting contributions, 0 decommissioned session nodes, and 1594 active session nodes.

Session Nodes Awaiting Contributions (0)

Public Key Contributors Operator Fee (%) Contributed Open For Contribution Min. Contribution Expiry Date UTC (Estimated)

Inactive/Decommissioned Session Nodes (0)

(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.

Active Session Nodes (1594)

Current storage swarm count: 274

Public Key Contri­butors Operator Fee (%) Staking Requirement Last Reward Height Last Uptime Proof Expiry Date UTC (Estimated)
1136bbc129c6a8ad791551f096f542fbf9955db465b7cf5103a2e90205f69c55 2/10 25 25000.000000000 1931299 0:03:32 🔓 23/9/25, 12:14 pm (in 13.3 days)
1e450bd2261361a0c0f9497c14ae7424f9f2587450f487468660a01fda8d2646 1/10 25000.000000000 1931300 0:39:25 Staking Infinitely
9aeab67aa26c531e6ee877273dc043f4a53fc7c9346b4b2d3f2531f44668e07f 2/10 25 25000.000000000 1931301 0:58:22 Staking Infinitely
10a4d8acf7e3ad406d91555b26016f0fa4f032ef5f40be33f72aa7662407c161 2/10 20 25000.000000000 1931302 0:49:58 Staking Infinitely
316097df512640737bb5c840daa632a0a8f32ba96c4bf816e59ad5fa4e8f3dc4 1/10 25000.000000000 1931303 0:47:47 Staking Infinitely
3a830c260d8045dbea6bc4cbc94ef1410edc6469c4228cf407a5a5203ed779e7 1/10 25000.000000000 1931304 0:53:58 Staking Infinitely
3d940eb1f9384984541045253b0e1786c1a99dddfaff384f9497766889f5bd1f 2/10 29.9 25000.000000000 1931305 0:16:33 Staking Infinitely
536a81ca3bd15e0d9e31b24f95495adbfe62d2adbb2ef74051590a5e1d4faade 2/10 25 25000.000000000 1931306 0:41:43 Staking Infinitely
434e0dcf0d56ffa262b3aaa46b2e1e43e4c03a3d9c41e32d45a443b8909ff80d 1/10 25000.000000000 1931307 0:48:05 Staking Infinitely
8c673b74801ba27a2c23596d681ddfe77fbe17ff852a922f93de410b23721eaa 1/10 25000.000000000 1931308 0:54:40 Staking Infinitely
+ 1584 more ↪

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

Last 3 checkpoints

Height Block hash Checkpoint Quorum
1932848 bbaa078e11f1d88b06bc5b1479a70be3afd8f9b05b5257d91e8afd1bf6c46181 20/20 signatures: ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
1932844 40a3ddabaa9a964a2b4088af4dc234e9eab59a0cb7f7ee4055e4528151aa5b6f 20/20 signatures: ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
1932840 b3a128814e0f115a8d8390f19dbf9192a917c34dbd40adfe01bcb1e302c62b83 20/20 signatures: ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

View recent stored testing/checkpoint/blink/pulse quorums