Due to the adjustment of the company's development strategy, CloverPool (formerly BTC.com) has started anew and has been fully updated to a new brand and new domain name to continue to provide high-quality services to our customers.
USD($)English
Summary
Status
Confirmed
Input
2.77818678 BTC
Output
2.77760701 BTC
Sigops
197
Fees
0.00057977 BTC
Fees Rate(BTC/kVB)
0.00008939 BTC
Other Explorers
Transaction
Input (1)2.77818678 BTC
Output (196)2.77760701 BTC
- 0.00303114
Input Scripts
P2WPKH_V0(witness)304402206bff45c21fb790c997a4acab6afcbf543c94a75344534e21611f7acd5f05e14202201d1aac1068911541e4d2d76fce00eb1c88fa9a1e0793839a50cdf0a7d39ca8fe0102d6c532323c5a05c87f41358a401ae50bd62cf1b957f4c16c2e8fbe62dc37f7afOutput Scripts
P2SHOP_HASH160 6143ac751483a0ab313680e0dcc174fbdf2efa68 OP_EQUALP2WPKH_V0OP_0 d73411f9386b5845858e352bd7a790467e4af248P2WPKH_V0OP_0 6bd05245b1aa291fdeab6e9bc534f60e7f8cbf40P2WPKH_V0OP_0 81b8e1e4bcf3752e4256c12e5a64f9b9e56b3546P2SHOP_HASH160 8caa781f5c6c7802387528d88df680f7ab0784f5 OP_EQUALP2SHOP_HASH160 964d85e648e768945329b2ad36c879afb0741ce3 OP_EQUALP2PKHOP_DUP OP_HASH160 88667218e511e6a2cd519e518d364411e43ae2cd OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 3362df87a9e972be3b46eedb28a39e53b68b6192 OP_EQUALP2WPKH_V0OP_0 4fa09d98562fcb1180251eb3d4a7bddab9f712c8P2PKHOP_DUP OP_HASH160 6ab9d9660cf1016a90a99ea462a3320111b175fd OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 4e2d5a4bb6a2f16aa72374c4cce16d6f8d176318 OP_EQUALVERIFY OP_CHECKSIGP2WSH_V0OP_0 fe76314d8b2394bf69a17db4e475a17d8fa2adcbf363037a46901296f40d5d1bP2SHOP_HASH160 d97cd7ae4a3f01d4a2c0d52bc33bda3ba2c6f9b0 OP_EQUALP2PKHOP_DUP OP_HASH160 bed0990cc959e6f735c153454595694d8a2a6a6c OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 e8c28ec4ab1f40ad02c8ba8e48d89c97444a54baP2WPKH_V0OP_0 79cd946f9ae9f3b1346a02e08fe72f2dae0ab9b0P2SHOP_HASH160 eee47a77f032dcbcae0eb0e72a125d20e325ece5 OP_EQUALP2SHOP_HASH160 225e325d027dcfb9c92e6c2148d5fbb5786f3fd7 OP_EQUALP2SHOP_HASH160 327c30d64418c9241b659761b20854b0e59a58cf OP_EQUALP2WPKH_V0OP_0 e8ee098aba2da49b06fb68c7bc586a18dccb10b4P2SHOP_HASH160 16194275a995743386baac1dd5c1813e0e51cb53 OP_EQUALP2SHOP_HASH160 f65809d0c35e09f8fe896e8b0077fb597e843b71 OP_EQUALP2WPKH_V0OP_0 b9916356d592e36aa701ad7f194a98e82368d44eP2PKHOP_DUP OP_HASH160 e5cdbc6a896fa02c0d3f1c05ad34299b66c1800f OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 05ab1286409e66afa0fb92d8957bdf87ca999cb2 OP_EQUALP2WPKH_V0OP_0 669d14ffe6a46cc321b451fa9e9cafa615b618acP2PKHOP_DUP OP_HASH160 687ac30fc345235ced650e8f5cb0ebebaa533b30 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 08889f39545825d3fb31163b35194eae57f4dcb0 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 88612b6cae15a48617671b4508349179b390f69b OP_EQUALP2PKHOP_DUP OP_HASH160 d090531c6a9ea518beaf4d4708c8a999f23e08a6 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 6afed984a42e386a57da63a09cb986ac562c02bf OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 cab25ff4926b3fc9b23207289551f1ccdd90dcbc OP_EQUALP2WPKH_V0OP_0 5ba522f92358a18783e945c6efe57eecef3726d3P2WPKH_V0OP_0 79170db3bab6dd070da58b12b7077f8cc118b2d2P2WPKH_V0OP_0 ab611d8fa68d2ad658aa66670c243e79bc6c5c17P2WSH_V0OP_0 4a26ef9014ff04853b320938a4d25cf44cfbead5d1669f9ca65f8c0f6be95ff4P2SHOP_HASH160 e3b7b5da5f20147616aaebc3bf2aa439d591d2e9 OP_EQUALP2SHOP_HASH160 24bea7ea2da06254d469010b65f8db6666c6d728 OP_EQUALP2PKHOP_DUP OP_HASH160 8a100befbe18d7c5ad4a81ae8119b9dd8a2e9973 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 457c93fceaa61827e25afdb0c5ffbb9c2ab65a50 OP_EQUALP2PKHOP_DUP OP_HASH160 c1415b96a44c61a9e876af4add85fabc71963515 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 dcd0428693e4fd9aa463a742ae31229a732ba672 OP_EQUALP2SHOP_HASH160 2149877447196b3dc4e573a351317c6378ac740f OP_EQUALP2SHOP_HASH160 0d42b990af7348170e97e2e22fd01a8f30017c62 OP_EQUALP2PKHOP_DUP OP_HASH160 45db53e33acbe550a32ccbe9888218b54eaa5b43 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 730dab7583c8ab9d741b3dbeb2c3c485fe3b0858P2PKHOP_DUP OP_HASH160 eb3f5aa7c860ce82bb232287f55770f9ce2f6378 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 ca382e769b2b6759230f9807f1d9eb856a123433 OP_EQUALP2SHOP_HASH160 b3b2461b49ab28bd8673b595219c2e7cee655460 OP_EQUALP2SHOP_HASH160 2717764d4501a81872bbe40e6134c113c0acffac OP_EQUALP2PKHOP_DUP OP_HASH160 185705eb0078511dcf334f435bb24dac7c47dd17 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 aed8138d7c6829556eef7b4bb4ca34e26c9330c9P2SHOP_HASH160 ee861d5ddb48f40aef0aaf9a79ab998f6ca8c87b OP_EQUALP2SHOP_HASH160 f5b8c6d9cd86a2193b8bd84f04dee6b8cd1827c3 OP_EQUALP2SHOP_HASH160 ae2ce0b99813e93fb33d494f13bb1997a3a5b68c OP_EQUALP2SHOP_HASH160 aaa99be9d0b4ece2146c55a17293b87504d73fef OP_EQUALP2SHOP_HASH160 2c84c5f321180c778b7bb153121a68ac4c32628b OP_EQUALP2SHOP_HASH160 10872f4794797b153b00203dfb74c94aa6cf7efe OP_EQUALP2PKHOP_DUP OP_HASH160 e4916f6554a9376b4ffb49f66715d66b3d933d88 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 5bd97a387d4f625f48c50d14c6efec59e015b249 OP_EQUALP2WPKH_V0OP_0 4afb9d8cad8f9a1bb4d8bd50986782dcca80fbf5P2WPKH_V0OP_0 eb9960c07450b23d2e5d4bcf530e86b01b660e95P2SHOP_HASH160 b7fc4bcd0f59afc0f288688a9ea6b4aaebb12231 OP_EQUALP2SHOP_HASH160 7a7ff39594830ad8f9f22b2434d00f71244e95bc OP_EQUALP2SHOP_HASH160 f2f2372867bbc22bfedb8ee39a491ad769c27d1b OP_EQUALP2WPKH_V0OP_0 f25c17adcccbda52535c1e850ea546181243ad49P2PKHOP_DUP OP_HASH160 c658f88ef4f31a89cfcdc00d821c0916069459b7 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 717378590c743d2e42fd582c5b9e985940e2ec37P2WPKH_V0OP_0 5a80e2d46b68fb3f7f347a43be03b54844df71b2P2PKHOP_DUP OP_HASH160 74b296bb3da46fae528f87076a483502dd6601fa OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 4f6517ce5d64325522ff1a6503021e8e83525e72 OP_EQUALP2WSH_V0OP_0 584938f1c1ea82a45f33a9b75174c4f510ac0d0b011a2d6eedc7fa42fabf8d40P2SHOP_HASH160 7c862dffe158400cae52e37b0507cee3808486cd OP_EQUALP2WPKH_V0OP_0 27abae8c047efcd3310040316e1a5b3ebe3fbfddP2SHOP_HASH160 6b4f11ee6f315ff2a860998721f5d5970e7b88ab OP_EQUALP2WPKH_V0OP_0 45dfdc73664839acca2b617670fa1496c49920e1P2WPKH_V0OP_0 ca9bf38c8d16b07e696ffb637e7f7bd2fa3e59b5P2SHOP_HASH160 370409a86a18e67453c8b93282b753105b2809d0 OP_EQUALP2PKHOP_DUP OP_HASH160 221137f0c2c2d4eb8da33236a6f0ead15cdeb464 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 cd212b2ed1024289e79925cde88c6abc3c0a874bP2SHOP_HASH160 9b33938f944eb8ef93c4906a9315353e1977a329 OP_EQUALP2WPKH_V0OP_0 57bbae52a61dc8a8c7723649259fe41b89ea0197P2SHOP_HASH160 58b5a96aaaffe92c3bb8beddeb4f74c433cdc1f5 OP_EQUALP2WSH_V0OP_0 4870d267eb4a8dd81c52af69bb76fbf1ea7751936fe07f5f9564de81b0727bebP2SHOP_HASH160 cbcdbb8e63c2c1ed765f19023c67081c4547f411 OP_EQUALP2WSH_V0OP_0 229e18f35db304ec8a29769852846180876ba4bc994f0b38becac1d0ebf8313cP2PKHOP_DUP OP_HASH160 f170a2f1482fe4cf6be891ff504cd93c848b76a0 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 d2a7c0a18fad57eec68f8928b70d31408201f8a6P2SHOP_HASH160 305df54424fe86bfa8237b61e7ecee483fcc47c2 OP_EQUALP2WPKH_V0OP_0 c57ede3914c2ce641a90a9a5aead07bd4588a5d1P2SHOP_HASH160 a3e6ec69d99d0bf59c3095bb8b16a7f57e2e56e1 OP_EQUALP2PKHOP_DUP OP_HASH160 6e2a1cc6efe844a2efb1c963eff4cdf84535830a OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 762cb0d664a5eb5c4b485675d056f8dadf4c73e9P2WPKH_V0OP_0 1fcb04f67923689e4a3909374cd40243733fbc55P2SHOP_HASH160 a790aa4870c765860b078eb46adb6260faba5b98 OP_EQUALP2SHOP_HASH160 ba7fa9a492d37ea0ecabcf53dfa90b2c58e59618 OP_EQUALP2SHOP_HASH160 0aa3bb589a8459e790c96f9ff1fac93ed59b9617 OP_EQUALP2SHOP_HASH160 4d4a316fb0c56dbde4ddeb41f9dfeda2eac99c03 OP_EQUALP2PKHOP_DUP OP_HASH160 590ed92ab46e455c1031c4775c671b337fc89b2f OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 7aa3dc79f82845e7cb57f96ce412ce0c2af30963 OP_EQUALP2SHOP_HASH160 5436a557803bebb72c77198a7e93a2ef37eed47a OP_EQUALP2PKHOP_DUP OP_HASH160 b40dcb61b4696958d02ceb5f9afa481ef531a787 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 a45faf3dc11acd0e49abbb652299f17bda82ed47 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 02296623f1798b79d36f3a07bf0172bbbaed94c3 OP_EQUALP2SHOP_HASH160 174e32b934ee9945422c74259ea41a9d7b04c34b OP_EQUALP2PKHOP_DUP OP_HASH160 e42445dbe9bb4875dd41f4b95c3c02ea27fe0df7 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 dc88dec8535fffcf3d9733297312d68a8b136b2f OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 dbcfc5f054cbc54cd8d6583d213d64f8ca541795 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 cbe602c8b2dab3f6c698516ddc6678b5c62bdcfe OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 130a070eeddc9741ed3145143ee5984b0a766363P2PKHOP_DUP OP_HASH160 7b941e72674a6d2b9d5cc77dcf5844eeed245c3d OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 2b53f67e1f067eaab71851c6db0c0c2de9630f5e OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 1d7569cfbd829419cc9c82b29ff958897aeb184a OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 4faa92ae856770baf80386c9d63a056fd7128026 OP_EQUALP2SHOP_HASH160 73e64136f84091896d6d43305a2e366488fd4c30 OP_EQUALP2PKHOP_DUP OP_HASH160 d5e936ac8e5ea7ebe7b057b4d0343817f4519774 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 1f644aa2d6981871f5fdf47a08acfc1e0cfab038 OP_EQUALP2WSH_V0OP_0 6917a3d366e83a4463b30a6a4a8ef0d43e23c8e665cef99934fa36708a89cec5P2PKHOP_DUP OP_HASH160 dbfe77cec1be2ad0a1d51b1c631b3a3d0bf3086f OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 0a964f8a5cb038f23dce8fb17f325af50ec22e36P2SHOP_HASH160 b8119f7b809cb89c578a8ab0915b0dda5c76aad1 OP_EQUALP2SHOP_HASH160 80862ab479121642719a4220f78a58005da38e3b OP_EQUALP2PKHOP_DUP OP_HASH160 f26e4d69958e285593bf6243b813b00c403346b9 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 e203d6c2017b18b400ab4513719573077f2a2a1cP2SHOP_HASH160 1fa8b51b65bebc88d3c2e83d2eae3f2d59be3ee2 OP_EQUALP2WPKH_V0OP_0 171924992e15229c97f7dfbd7006b862f0bc0d97P2WPKH_V0OP_0 fb806bcbc98b6f1c5878e9a2c6dba8620ee44b43P2SHOP_HASH160 728853851581800d4071fb4d6ed27a2cbbc6ecd4 OP_EQUALP2PKHOP_DUP OP_HASH160 7e28fe3ecd855c708e409c244f9590d6f20c2394 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 768faaa497a425d2526ef3c53ecde10c92371736 OP_EQUALP2SHOP_HASH160 d30ebc2754e5b608cb20b081b4b226e114269b4a OP_EQUALP2SHOP_HASH160 473683c4920085950a347ebec9da65f8e39ac938 OP_EQUALP2WPKH_V0OP_0 8a27da002de9d8b855d23d29b67af5abc0c33551P2SHOP_HASH160 c83d2d5e91b055328bbb9f68203e9e69ac6b4d95 OP_EQUALP2WSH_V0OP_0 2cb2531d29d148f72df8db43a88454a8cc4c755c846c7ee7b708a817f13580a0P2SHOP_HASH160 e75e4408125741f2fa534e24445b45afeaafd5e8 OP_EQUALP2WPKH_V0OP_0 932b74f1055b48ae2e9ba1fd72585a524986ff1cP2SHOP_HASH160 89c9197e3b47dae1326e6603a05b51c7e5c52310 OP_EQUALP2PKHOP_DUP OP_HASH160 51b7f25d9fcd482195a0ebc84507973a27c48714 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 3043549e8ea6cf2694f33c0793a1361f121d2fdcP2SHOP_HASH160 fea1b50a27065220499fd3430a0b3f6323cc2b12 OP_EQUALP2SHOP_HASH160 a89b3a50d59dd2e765df9ae3f29d366b6984e38e OP_EQUALP2WPKH_V0OP_0 7fa52235800d6035138c265656cb62448356a6b6P2SHOP_HASH160 55f7da8b9f432cfba64095c966dae5ee9d9af455 OP_EQUALP2SHOP_HASH160 d614dacb1d973481288ce86eebceb7f5e93d1b82 OP_EQUALP2SHOP_HASH160 2563b640d73b8482482ce8365818ebed90c2a01d OP_EQUALP2SHOP_HASH160 161e5cd8d132b38227353a5c9512e56c26499553 OP_EQUALP2WSH_V0OP_0 68b178848939f12a537a55bd283a0ddf2ff6cdea93db064fa401a3cfe2c304c6P2WPKH_V0OP_0 591a5bf52e0c93d666ee4c101c71ce9f0e938ae0P2WPKH_V0OP_0 5b11017c75c0b58e685b166a19cf49dae0c05007P2PKHOP_DUP OP_HASH160 f0290a00af12a300c1212b5636da4c5700c9add2 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 d00bd506d0db6871a504fff87be7294aca4b8d43 OP_EQUALP2SHOP_HASH160 7766f94e232fba5b590057874f514976a79404de OP_EQUALP2PKHOP_DUP OP_HASH160 6341a03fc83547e0bdd1dfd4dec7199a95d3c327 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 9d654f47bf26d6aab95e22843f1a31240c0bd788P2PKHOP_DUP OP_HASH160 e2b1b572d450de6a2c66074439923f0bf4b1bf64 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 b4c1c35b6cf8f05f9be21a96befded13b02e2e40P2SHOP_HASH160 7f04b4fe126c0423c814efe201114d476fdde4ee OP_EQUALP2PKHOP_DUP OP_HASH160 7089c7c9a7f193cddbb1ec0bb570c6512c87e926 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 54c15e560c37142aaabf034e70f1e94a510dcc4aP2WPKH_V0OP_0 fd4ce6509e07dc4aa4fae48a2e52a079afd0e676P2SHOP_HASH160 d0323e06b08e3990f82e27ec34942b01660f16bf OP_EQUALP2WPKH_V0OP_0 0c88716b45fccc6a87a6f7ef3753877607cd73b4P2SHOP_HASH160 df7623a5c0a88e22721161f587d6f5a0910f975f OP_EQUALP2SHOP_HASH160 dbc65b32166f121afa4d9a963d958c0d31621886 OP_EQUALP2PKHOP_DUP OP_HASH160 4cadc82c799af47da3e9fb0b2212433c901e9d71 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 06771fb9b0901184f2f6f020a303aa4d7c6f342a OP_EQUALP2SHOP_HASH160 0be6d9ea0ba28e3b31d2a3df121a16e925483ff9 OP_EQUALP2SHOP_HASH160 841ce7b97a11c295bc24778be22f727ce266fca2 OP_EQUALP2WPKH_V0OP_0 d328e65cc2bd14b7716c05eb28f8111d200da9c2P2PKHOP_DUP OP_HASH160 0f2028ee829aec3c217c0c055bfe28ef56e3116c OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 a706a52f025c98a725d13193bfb471abdecd0a9f OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 719392d5ca2e8e9256374f7d9773d10491a3d9d4P2SHOP_HASH160 4b486ea9b6ad4c433283ed60cc590d4534a3956a OP_EQUALP2PKHOP_DUP OP_HASH160 108a22ef9266809cc5d5309353a20d82d5780070 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 b8d240d8ad7863d6d31e172f51441288f29985eb OP_EQUALP2PKHOP_DUP OP_HASH160 85c88019df17435f361c72516556eb764d929d24 OP_EQUALVERIFY OP_CHECKSIGP2WPKH_V0OP_0 293f2f51b3c60f4d624f538d86a6dd3c8738244fP2SHOP_HASH160 182677b62c25298e4f696c6092aa2a1b15fcbce8 OP_EQUALP2SHOP_HASH160 f43fb16efa303699149bb6cfb47b741d948117cc OP_EQUALP2PKHOP_DUP OP_HASH160 3b833f63e2d3b38e085ca61e935fcc46be2af63b OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 08a0081723afe6287cad94d38080f644f1b0f6ac OP_EQUALP2SHOP_HASH160 b4ef245b7cbdbf48370212f2a27f018fa5f77792 OP_EQUALP2PKHOP_DUP OP_HASH160 439b13adf49f46d16fda581321b397f45996f269 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 5c4ecfef94d83812272828645f8d9793903696ae OP_EQUALP2WPKH_V0OP_0 9275c69c4385d3ef83692f2a7cf0faa30593c79dP2WPKH_V0OP_0 98067cfda34d72a64093a830eb6ce5191bcf0d3dP2SHOP_HASH160 fdd545e3dd7aaed1c2d64a3294d4c23d44a44b69 OP_EQUALP2SHOP_HASH160 7d663c08d2072febac89052a3324f39f50e0b411 OP_EQUALP2PKHOP_DUP OP_HASH160 4dfbdc4270a25abda4d8fcc75db9106c8eb02135 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 9c19c189a5bc1854cdfefe467a21605a57295633 OP_EQUALP2PKHOP_DUP OP_HASH160 8b2b37373bd762dade48482e6878188ffb998846 OP_EQUALVERIFY OP_CHECKSIGP2PKHOP_DUP OP_HASH160 8bcfe438baf5ec0a98becbf71aeb839a3e9628b7 OP_EQUALVERIFY OP_CHECKSIGP2SHOP_HASH160 742454ebf10edabf65d9159ab40001739d64dc34 OP_EQUALP2WPKH_V0OP_0 8fafe52c4fa159b7a8883007e458f529db8a7455P2WPKH_V0OP_0 bea926ee388ae0511488ddeb8ac1c1180faa9cb4