Onion Monero Blockchain Explorer

(no javascript - no cookies - no web analytics trackers - no images - open sourced)

Autorefresh is OFF

Tx hash: 20bd1a835d91ff46960edaf98331090265b620662700a109c29cf6ea41227f5b

Tx prefix hash: 2beb9e25c6adcec2b3314bbf65be989feaa9b6a926febb593097b9cd4bf8231c
Tx public key: 5929330f56fc8e7371cfa796cf7d61dbb86d72e6db975d09456b76758bb0511a
Timestamp: 1688439202 Timestamp [UTC]: 2023-07-04 02:53:22 Age [y:d:h:m:s]: 01:136:06:22:53
Block: 2922012 Fee (per_kB): 0.000137980000 (0.000040942196) Tx size: 3.3701 kB
Tx version: 2 No of confirmations: 360475 RingCT/type: yes/6
Extra: 015929330f56fc8e7371cfa796cf7d61dbb86d72e6db975d09456b76758bb0511a

16 output(s) for total of ? xmr

stealth address amount amount idx tag
00: 81fa4fd123f9768350b7238c134c039f129ba8135a907c2389190fb2ca55ffcb ? 76319198 of 119511405 <95>
01: ef723b1825479c3431fda85c07436cb399e66218c8073aacc5d990f314c009ec ? 76319199 of 119511405 <34>
02: 34ac0d7a65fa5d6c3a5c9f9611edeabb711f60f70150eb4d1de2ddaca3e2e245 ? 76319200 of 119511405 <8b>
03: f326ffc226d1ac1fb89b9afcbc13cdf9eff209a3d768c6011ff795b8f489f4d4 ? 76319201 of 119511405 <af>
04: bc2ad3f63f21cb9454306ce400df945f722ac63e7fbd25a81b87fc79d0f93cfe ? 76319202 of 119511405 <63>
05: 99fe5e32f484cb73ce7aa37f7cc6d1dd6acc732c7f697888db71975a942c1b91 ? 76319203 of 119511405 <d5>
06: 2a678860650689d051e6b6cf8a6447ebf97f39de4b82b64d450aa69fe9e6ff87 ? 76319204 of 119511405 <c1>
07: f3341b4193daf388abb5d58186a7351f28d64f45d5011c523bb1b7b57ee9ef2e ? 76319205 of 119511405 <33>
08: a164daab46a97d9e58a14e2166e42d0df2c3e376a399dee9cbd881a5c80b6bd1 ? 76319206 of 119511405 <95>
09: 9fff93399fa3cd33b604b0152ba237b9c381d197400b501a2b485e78552f6e20 ? 76319207 of 119511405 <fa>
10: 06781e78ea08b3a7f7c9f4a5498120dc06a95effbc89bd827ef781a9e61d5119 ? 76319208 of 119511405 <5d>
11: a27d8769301cbebccbb8cda07c494baee756428cf43571ae65ce606aa7cbadce ? 76319209 of 119511405 <99>
12: a62142c5214c7c5b91d7462acb35a42b74274680996adfa1c055f315edc716eb ? 76319210 of 119511405 <b5>
13: a9416b9c369c9e8bac5df12c129cfde583b7988294df11d5ce76f2386150c8ff ? 76319211 of 119511405 <7a>
14: 17c109cbd17fbe2a2bd1672e6456b868f20bd36d27ff89ad41ac37c38770ce9f ? 76319212 of 119511405 <87>
15: b0ffcd6805e748f814af7ee24f44605dbdbfe406c39bde7f58d9007ad7a60d9c ? 76319213 of 119511405 <3d>

Check which outputs belong to given Monero address/subaddress and viewkey

For RingCT transactions, outputs' amounts are also decoded
Note: address/subaddress and viewkey are sent to the server, as the calculations are done on the server side



Prove to someone that you have sent them Monero in this transaction

Tx private key can be obtained using get_tx_key command in monero-wallet-cli command line tool
Note: address/subaddress and tx private key are sent to the server, as the calculations are done on the server side



Inputs' ring size time scale (from 2020-06-18 10:09:02 till 2023-07-04 03:23:27; resolution: 6.53 days)

  • |______________________________________________________________________________________________________________*__________________*_____________________________________***|
  • |_*_______________________________________________________________________________________________________________________________________*____________________________****|

2 input(s) for total of ? xmr

key image 00: 85a4757c096aefd133724c31d6bf0c9f19127d252572a160d7871ebbe89ba483 amount: ?
ring members blk ring size in/out timestamp age [y:d:h:m:s]
- 00: 448fb75e3c1af29a052ba92fbd84a66b90c09c0e8c88998e50256a91081fb99c 02638768 0 0/299 2022-06-05 01:02:12 02:165:08:14:03
- 01: d846c0f46f581cc2d4909da3553c64506cbe1f87c328e18722dcec43f8802b79 02728823 16 17/10 2022-10-08 06:03:38 02:040:03:12:37
- 02: 64f108662ce728cee9cfc7ffc394e2c4746231d83acdfdf4c730580c44a07c92 02912545 16 2/2 2023-06-20 21:41:17 01:149:11:34:58
- 03: b2b69109ed09a3d6e9322b8f48b2868fa8dad079d4ad2187bd94144f9a98eb1f 02915282 16 1/5 2023-06-24 17:34:06 01:145:15:42:09
- 04: e6649b2ceb2efad214ed15038d8b2e82e17a872c828352cfe84cf350783fe652 02918602 16 1/4 2023-06-29 10:21:58 01:140:22:54:17
- 05: 086e9a69f1b146dc4b724faae5509d4445ae78c2205d0a1f6b892352d313791d 02919950 16 1/2 2023-07-01 05:52:09 01:139:03:24:06
- 06: 1cad9ca93062dbafaf2e1124de35f170dee47eb665bd5a64c7b5936c9097ce13 02921167 16 1/2 2023-07-02 21:57:24 01:137:11:18:51
- 07: f26ab3945cda0efb4975e9d715baa386ec495afd0ba6c55507b0d38a6d6ab4ae 02921547 16 1/2 2023-07-03 10:56:12 01:136:22:20:03
- 08: cf5e9df20508eb92c7d8c0f28ae1cb02abb4653f04fbb47b6e4d3b7b8a53cfe9 02921955 16 1/2 2023-07-04 00:40:53 01:136:08:35:22
- 09: 00199a553355660fd0b7c52fe9c58b538f4bff85dc7411738bbed866f4ba8e61 02921960 16 1/2 2023-07-04 00:54:24 01:136:08:21:51
- 10: 84c6d5aa91ba5c5e67f5881c1e6abde6dfa150ea86f64649d2d8a9dd4407f35e 02921983 16 1/2 2023-07-04 01:40:48 01:136:07:35:27
- 11: e580dcf3d141e3b934c6e8402a12376a285163e9ad3fa503695f723b32754d09 02921983 16 1/16 2023-07-04 01:40:48 01:136:07:35:27
- 12: dfdb5210b7cdd6b18a7a6dcb0f361376426bd0d65a3d71632dab7f1f3ef0cb9b 02921984 16 1/2 2023-07-04 01:48:11 01:136:07:28:04
- 13: bee6f4f11f58345d660c4faa1d1b1bca0b115a70732faaeec4019c45aa23b314 02921997 16 1/2 2023-07-04 02:17:33 01:136:06:58:42
- 14: 4440fb989d5381432f6292170076f568b6b6daa5adf9f48b609fccf8019f1679 02921997 16 2/2 2023-07-04 02:17:33 01:136:06:58:42
- 15: 525a0b6cbf3516b60c79487db740590dce189a6c5a1658c6964ac62817ec165d 02921999 16 2/2 2023-07-04 02:23:27 01:136:06:52:48
key image 01: 31ee34d9517f512c0bffa705c8a65d82b594dd0370e925034347e4d2e8ba71ab amount: ?
ring members blk ring size in/out timestamp age [y:d:h:m:s]
- 00: d3aadbb88ddb905dac7941746e56e5b10c553af3f27480d986331da878ff9464 02123266 11 9/2 2020-06-18 11:09:02 04:151:22:07:13
- 01: f8aa3ccc49d4eb9547c1f1be40045df26e473440d1f328e235e008d9c4fb43d0 02770644 16 2/2 2022-12-05 11:38:48 01:346:21:37:27
- 02: 1e90718ede6c4f0ce11e0b89074c6697f954546cbf0b80996d8ef0cc8feae2be 02903612 16 2/9 2023-06-08 12:37:49 01:161:20:38:26
- 03: 31c09e70b33c49c0d111feb9d424f7738e8a3534a24b4ee6b33b7e0f4ec6697f 02903690 16 2/3 2023-06-08 15:14:07 01:161:18:02:08
- 04: 135250d9cd58682ec6f249dc7b711895593dfa6da3b08c368a3e3a2e0847f20b 02910975 16 1/2 2023-06-18 18:45:29 01:151:14:30:46
- 05: 16bc1587023f5c05a92c8d63b0b7db4301c61b0da168396bd38def542d732ae3 02914898 16 1/2 2023-06-24 04:54:19 01:146:04:21:56
- 06: 81beceef848a8faf4bcefcb1bb86f8b5c84bfb6becae45308076a698591fe7d2 02915915 16 2/2 2023-06-25 15:29:46 01:144:17:46:29
- 07: 7e69c21e969391b5e7698d376b40aa4059c40de56ecdc1755cd7fdaad9cf3a19 02918433 16 2/2 2023-06-29 04:18:33 01:141:04:57:42
- 08: 719c71fe97b90f94f39bf7cd89ce1e867711e0b778279bfd7a9cac8ce5148611 02919979 16 1/2 2023-07-01 06:53:29 01:139:02:22:46
- 09: 9886d3f363827b1d1c52bf810ce14a86c5fc7618a83ec5a42fb95473f80c450f 02921389 16 1/2 2023-07-03 06:00:07 01:137:03:16:08
- 10: 096b9d21b223fced86a0afed00999bc4ec2d9169b5c80196310017ec254fa90e 02921572 16 1/2 2023-07-03 11:47:01 01:136:21:29:14
- 11: a215dca80af7c242fb1c412547dd281e7c72197669edd4843de62c97910d7205 02921619 16 1/2 2023-07-03 13:41:05 01:136:19:35:10
- 12: 541bbe3cbc007397d6dc09f3105db32f07ab61f2999e9adbca6f62988e9f36b4 02921685 0 0/526 2023-07-03 15:29:46 01:136:17:46:29
- 13: 37dc6bf1a84f2922f2352b3b7fce9857e7681aabc09c6b6232ec22e14887c1ca 02921939 16 1/2 2023-07-04 00:01:56 01:136:09:14:19
- 14: 94fcc3fda276b5be9490162e2fa4c82875493fe12e251e321b1861c776106d5d 02921941 16 1/2 2023-07-04 00:09:21 01:136:09:06:54
- 15: 820100d5745efc2e4f756641a070180e94f9d390ed23607ba42154a048376623 02921984 16 1/2 2023-07-04 01:48:11 01:136:07:28:04
{ "version": 2, "unlock_time": 0, "vin": [ { "key": { "amount": 0, "key_offsets": [ 54438338, 7801453, 13289107, 193190, 334191, 103210, 87744, 26607, 40494, 817, 1504, 189, 133, 875, 10, 117 ], "k_image": "85a4757c096aefd133724c31d6bf0c9f19127d252572a160d7871ebbe89ba483" } }, { "key": { "amount": 0, "key_offsets": [ 18224216, 47067392, 9601087, 6895, 512673, 286606, 78299, 266414, 117980, 100441, 14415, 5445, 6057, 25203, 275, 3644 ], "k_image": "31ee34d9517f512c0bffa705c8a65d82b594dd0370e925034347e4d2e8ba71ab" } } ], "vout": [ { "amount": 0, "target": { "tagged_key": { "key": "81fa4fd123f9768350b7238c134c039f129ba8135a907c2389190fb2ca55ffcb", "view_tag": "95" } } }, { "amount": 0, "target": { "tagged_key": { "key": "ef723b1825479c3431fda85c07436cb399e66218c8073aacc5d990f314c009ec", "view_tag": "34" } } }, { "amount": 0, "target": { "tagged_key": { "key": "34ac0d7a65fa5d6c3a5c9f9611edeabb711f60f70150eb4d1de2ddaca3e2e245", "view_tag": "8b" } } }, { "amount": 0, "target": { "tagged_key": { "key": "f326ffc226d1ac1fb89b9afcbc13cdf9eff209a3d768c6011ff795b8f489f4d4", "view_tag": "af" } } }, { "amount": 0, "target": { "tagged_key": { "key": "bc2ad3f63f21cb9454306ce400df945f722ac63e7fbd25a81b87fc79d0f93cfe", "view_tag": "63" } } }, { "amount": 0, "target": { "tagged_key": { "key": "99fe5e32f484cb73ce7aa37f7cc6d1dd6acc732c7f697888db71975a942c1b91", "view_tag": "d5" } } }, { "amount": 0, "target": { "tagged_key": { "key": "2a678860650689d051e6b6cf8a6447ebf97f39de4b82b64d450aa69fe9e6ff87", "view_tag": "c1" } } }, { "amount": 0, "target": { "tagged_key": { "key": "f3341b4193daf388abb5d58186a7351f28d64f45d5011c523bb1b7b57ee9ef2e", "view_tag": "33" } } }, { "amount": 0, "target": { "tagged_key": { "key": "a164daab46a97d9e58a14e2166e42d0df2c3e376a399dee9cbd881a5c80b6bd1", "view_tag": "95" } } }, { "amount": 0, "target": { "tagged_key": { "key": "9fff93399fa3cd33b604b0152ba237b9c381d197400b501a2b485e78552f6e20", "view_tag": "fa" } } }, { "amount": 0, "target": { "tagged_key": { "key": "06781e78ea08b3a7f7c9f4a5498120dc06a95effbc89bd827ef781a9e61d5119", "view_tag": "5d" } } }, { "amount": 0, "target": { "tagged_key": { "key": "a27d8769301cbebccbb8cda07c494baee756428cf43571ae65ce606aa7cbadce", "view_tag": "99" } } }, { "amount": 0, "target": { "tagged_key": { "key": "a62142c5214c7c5b91d7462acb35a42b74274680996adfa1c055f315edc716eb", "view_tag": "b5" } } }, { "amount": 0, "target": { "tagged_key": { "key": "a9416b9c369c9e8bac5df12c129cfde583b7988294df11d5ce76f2386150c8ff", "view_tag": "7a" } } }, { "amount": 0, "target": { "tagged_key": { "key": "17c109cbd17fbe2a2bd1672e6456b868f20bd36d27ff89ad41ac37c38770ce9f", "view_tag": "87" } } }, { "amount": 0, "target": { "tagged_key": { "key": "b0ffcd6805e748f814af7ee24f44605dbdbfe406c39bde7f58d9007ad7a60d9c", "view_tag": "3d" } } } ], "extra": [ 1, 89, 41, 51, 15, 86, 252, 142, 115, 113, 207, 167, 150, 207, 125, 97, 219, 184, 109, 114, 230, 219, 151, 93, 9, 69, 107, 118, 117, 139, 176, 81, 26 ], "rct_signatures": { "type": 6, "txnFee": 137980000, "ecdhInfo": [ { "amount": "2f1439bae80e6524" }, { "amount": "a16ee55f3c2e7a2a" }, { "amount": "7d0e7b314ef5e240" }, { "amount": "113c834f8b231477" }, { "amount": "f757477ae9d0ecfb" }, { "amount": "ec6ac937cd3357e3" }, { "amount": "3e0d07d6b86aa0a9" }, { "amount": "bffd71957882f647" }, { "amount": "299373191a47bf23" }, { "amount": "878e11366ef21f63" }, { "amount": "d68d91764f9fd064" }, { "amount": "fbd5b45293fcd4d3" }, { "amount": "dbe2751788058289" }, { "amount": "2ba0f45b0ff54b44" }, { "amount": "de766ff1bf800289" }, { "amount": "7ca6f6571f01047b" }], "outPk": [ "17801c81ead8d1003fc9c6fefe39b34a479d2c7aa557a8b819cd0bcfa080499c", "d2b80ac7f4602a98bd2f83841d282f74e336a6cb0a0a35e2108b7d85cf117447", "6948d4ed1f88d79b30d6a10291148cc04950ab234b2b1bb0a523a550a57b1141", "0892c3600c4141132a1ecb511fbeb105b8bb81739d3eb0d59f43b3733a52b67f", "02778c2492ca10d50b0a5eef4f49a209479a637b5f33fa3fd462253f1ceae00d", "38dc2d715dfd7935344edb71f57a4268957f5fea0ef153b60aed84d5e096764b", "259beb2734cd2a9e1e0f8352b1b25104199bf6abc2373c47183e02b2b63d0ff9", "efb6105f3d71d3d08a0653f1c13041d964852b05a6f13568f09ab2187fbf3035", "9c2b5532b9696217aa99c6cfdfd573a58537cdff1ffe07856b9d67cb8b88a627", "1b022a3bdde19c643ccf59e76776e7a9d850f716fe48597d0dad55fc620242ba", "0c4b285179e376b2f231477651abb213b89f70a939c6b06bc48b544be4812980", "e4c6ab7022226473d89c7267d8e0baa772904ac2fe095c0fe567847ccb949b46", "e1b3f40c7605561ea89719b4b8d461770868237999bf76a42c1df10c90a26982", "7099f36fa839e62865d79dad23fe9cd87ed7b1d974a77db059a542b5afe1a502", "cd317009e27af1dd48f2cee3694e89c3402d0838a75e1f9f4cfcb83a90c00ada", "3381edf5d558356bcf2faee608a8a00ffac63cbe1988615dee3d0959a8b15491"] }, "rctsig_prunable": { "nbp": 1, "bpp": [ { "A": "4439e5ea84ba17494ca9892baa180274ed0f9190a03463e293ece2a9b58b9aab", "A1": "254555e0bff41e97924541aea9dbfd0c4dc2794dd1ec7bb4d0ffdf1b991cc191", "B": "81ef451f2a1d26fd87ae0b56c89654c65c8875b4a2bf3c2a810998cdf5c55a06", "r1": "077f7acb2021f8bcb33adb16049d44c21191116a39a5bfabcc18b2a49683bd00", "s1": "3d0d039b871b36f0a3f290feb2aae408987f23a889fa10e5d1de8a602df10c0b", "d1": "7d4ec3a47f834d68347b601623faf83bca0c529efb814bd22d4ccc4ddf39e902", "L": [ "729f507bc5c9532192f9dbb856bae360d946bf3f457e51112809d08260336d50", "66551903e089a03878bb970790fb00952779508115d276a3292f427e20229d15", "5de0d3e6b9fd8b0a37375a8f1355ad4763db3e3527cd18a188c5a482528acb9a", "15e87749723d257e28c2ee9168f311ba60cbc4811a0d98de152869583d3aa229", "ec821ea5a1920c029c933b03e228c009d26bb88df4a47adbcb146e35203862eb", "437dcab1bafd8ad41cdffbc4370fb67c04b0a9a76b78a0fbf9dc76679e94f9f2", "77fcab2f1fbe7e69a191751fbc92650df5af65cae7c9dbe11a9e310cb5b3b9b1", "47ce55c2f0f2e9872a9faee9bf1ddd9732948033bed99e76fa9e104fc7693927", "ba6f9af1e154774d52ad5ee65a23f1960e89c739a4112f05951e750f09c1f3f3", "d3b33136159ac58d4f9ac120bbc2ff4904a625b925ee82d1aa0636ac23abe7c5" ], "R": [ "6e102c1ad0157f72b100aa7cf5e47f898e6fc82e2d3049befa1be5a1d3d82c00", "d207459c1aaa50963a3e881a3f20b05e4e82828ca23c7ab0c52548e692d1f2f8", "044976ece0c4c91a38de1aa2e83c5ad073fafdb4021b2b07b6e6e939b01dbe1f", "5f7a0188da3417e917f3c9dc1238583e2f1785a3ed8f67f57e3940d0ebdfaaa0", "8b9a23b99754455717b9d44c25851cc6eed2fc948b6a3b84c4e814c337b12640", "76c4fea93fcebda527d906576ca5bc069a5cf0ac4b77d9608594d5217243b250", "17cc9affcfa553865c2d4033117852d5eb05121ea0a91503b928a3308d7b8088", "a3e63365cff642f3b02593dacde8be819d97d2e1aa3b12a779b36617c3432a2b", "081f9fc54c5ae40c0b3a5534598707e9770a1d087c109b6cc6b770c10635dc90", "c985250d67a022ccfb37892aee2e6ba679fb2240ded6af1994f803977df0cff4" ] } ], "CLSAGs": [ { "s": [ "e048344e8a2653618422dd2afc927a47637a37512ab4bd329a75d64f9881f50b", "a029e42036b995cfbbc393d22cda94f89321dd158d6ff6d10d6eb5fa9b6a9309", "c5926457bfc524b89400b0c2222896d6adf7534b9c9506a94807a4506c2ac605", "de8b03f6a5e527641b0ba0d517fbcbb5077ad3f96f23aa09c5cbaed27cb50e0a", "4e0f550ab0983d04529170deea876686ec7920aa43903c0a0374b22c6be1bb0c", "45becd6d0d32a1b41e05733e9e5b4a93329882ade2e40d1eb6471ee69d8d7e05", "1fc61c97a568fbeefae53a62cbf0d97e139f9e4b40257d634b12743e68e1e60a", "5c2c61fdd7b5be96a51c75a447d85aecd357d3f5a2bc4005d7545f7bd36a5902", "22a6c32b59db2f520d1be5e6b3a4597830d54155e8c28e835a21f7eb4060d30e", "55ec5e7f4d53bdfd99a734089544977c955acb4994e50df2514dff355671f70b", "70e42d6325bd85296f3579aaa01ceb9bd5348cebce0311bf00879d3b79aa5e05", "d98bee81c4b026cef5158eb7acebef45f9e8f6d67ca86971115b0bbedf71f305", "ce20e406e405057822d8b6e2ec445535ff18528363a22faef10d881c814cea0d", "4e66ad35a3b6ab99f833f35ee6df09f1b2e9af298456cf0a4e46e467813b7108", "9e6a384aa1b08a2c522d4f150267da410aec49502bf8305115fa1da55edf080e", "47b1df61aa024b1afd491f5d139a15cc482ac2871b6177925dc7f81398437c09"], "c1": "a54b374827ea646401bd5e82681c7913ca8c4732f4b89bd027a3f561c849840b", "D": "93108d8798684e9b32bff6d67030e43ef4152624394f5a4ee3cd2cfd87a2a6b8" }, { "s": [ "744a3387a82cb95c97427e6a1cccf3eb2fc047c0b460cd39961a810c3815b307", "2b8f892ef032942722bd62e75f8d2642d1b8909296dbc24e2946b72addb3340b", "cd4632542351677bedce6185c65210b2519d02db0c8927bb8521e6c16cf63809", "1ac4fab51a06df00126d000e7177042daf31bcf4ad116858a98ebeed1fbf9507", "ca37ff477d963910058dd69afc039bfe400172a939f6e2c32896d1af3604c800", "9dd0a9f0a45a1126a622d9f92d897c2b13da27faad16287b614dc2ecbff6db0c", "8995d39f2822f2aadd53b7cfa63d165c9145a60af9e20949ff11d5aee0aafe0e", "d7b8905ded8ad88385ec0f576d3f24a2b6f37a91ad0f9565b27383430101a805", "1afc5b3649e00b7d135a4fa88dabfe38eb45ab7d78411c4f13cf3f649699740e", "a8397dfc345a9974e1341c4ef527fa9b4c1f4ca14d44f582dfa4e6a834bf3209", "8f1f236fe41d56a4f9b8c2d140d45119bd8727cb0cb57047dd5a6ce1aac6560c", "efc1684bf225c581ff67f4f9c9c8987213ef721974e3fe4d2e647776ad9e0303", "64e772c089008eab8bb8728f9746eba02f5bd5c00ca2988b2b49e418a363190c", "8b096a5840ddd81ede582b50e44216b2d81eb1b6ef9a0bb93e82a5393ffd660a", "f8c1832859ba0d0bdf8b157f57b1c87161f427328179d9e21a0f9173a8acdb03", "1e28b8f7625419bfa273fd5b98ea1d7a3feaa9b0b55cf32976028b63de3bbb0e"], "c1": "b1515cc3326cc2df2919c30aa9ff9939ad08ccd05e7bdc44f1bb3de24bb7f406", "D": "37190e3ba258cca0faac1fbc51a2b06af825bd9e4c154e520738c6757afb754a" }], "pseudoOuts": [ "77fc110e80e8fc769e04e6fa230c0d7febcaba61bbcb2b6ae61141ca1f6fd295", "9443c7a6e3dce1358db3bdd01556cb399bc704fd7a07f75e939573ca970093fe"] } }


Less details
source code | explorer version (api): master-2023-03-28-d669720 (1.2) | monero version: 0.18.2.2-e06129bb4