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.
Transaction Hash
2b5d692065b460afe578b0dbabc48031dd9d35071499ca3c364a7e06c41b7e23
Summary
Height
Confirmations
14,890
Timestamp
2025-01-24 16:01:55
Size (rawtx)
6,403 Bytes
Virtual Size
6,242 Bytes
Weight
24,967
Status
Confirmed
Input
0.73396454 BTC
Output
0.73380848 BTC
Sigops
210
Fees
0.00015606 BTC
Fees Rate(BTC/kVB)
0.00002500 BTC
Other Explorers
Transaction
Input (2)0.73396454 BTC
Output (187)0.73380848 BTC
Input Scripts
P2WPKH_V0
(witness)
304302201d9f4b634a60714dd23954182bf1d29fef1c30b623a1d8f6161903c56b6c37ec021f34a728917981070811e9c186ccc54b84ac8d5f2839edcae18524682b22240301
034fcd1640bde5beca402a4be799bf62c938d98dc424fb263092ecaa3e700dd064
P2WPKH_V0
(witness)
30440220731206937c8ed36dcb2e7d419e12e702a8ddcb2e58df14e061b2a904cf743b0d0220619bc253f42180188273ed0855df1c70b042a4734553fc21c75aef7a012b2fc401
034c0ec6d4eb3fba2a6999cb8bdddf0c721e19fc76b02bc6890ad1d3ee7b012815
Output Scripts
P2PKH
OP_DUP OP_HASH160 a98c736f49caaab42e8a2c11535e64d42c028ddd OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 2e80ad93315f07ad9bf8bee0c35978e2ecb7a844 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 743a7ba9a1561b1908d06d7a2beb30b6d34b632b
P2WPKH_V0
OP_0 1ec8087c37b7b9bb2aecf77954b3e5574934c561
P2PKH
OP_DUP OP_HASH160 42c650db9cff6bab730536a053a96f3220418a33 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 2ceafcee64a59c29e68b758f4161d5d3608c7ba8 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 50806d7eda335ecd5982742a9fe825a4d016c217 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 0ac7ab5d708341dcb65d3947519e601dac19d6a3
P2PKH
OP_DUP OP_HASH160 155118304741992ab0aa1fd0531f06b708f0b26a OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 8355531301d409666be98450d8845903c62c1cae OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 6b1a117cab7869e29dee14a5fcf106274d762b04
WITNESS_V1_TAPROOT
OP_1 75ecc7d688d3d81d682a65d6c08f2b5092e61070ca120a46ef964eb873fc62d8
P2PKH
OP_DUP OP_HASH160 7c11a7629e8b3cedd3db537c28e7e126eb1ea9ea OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 a0d2a62a9b59543a3e70593a3aabfeac317ee346
P2WPKH_V0
OP_0 5c0b3a4ad038a284a9c4bbe3e3c7fcefa6054525
P2SH
OP_HASH160 27965410b07f52a2c51ebe1b237c9592e6fc3d72 OP_EQUAL
P2WPKH_V0
OP_0 755c05996e3634aec7183aba714d3d90b520c07f
P2SH
OP_HASH160 685a6eae299f2199db4759c1c088bd526a77b6e9 OP_EQUAL
P2WPKH_V0
OP_0 80267ba4946c9dbc6445f972b742d6b2f19134d9
P2PKH
OP_DUP OP_HASH160 ee9645aafe0e9cf369886bb52045d579d8d74f4e OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 de9da06ed64a556634bf683672e9c8d863459098
P2WPKH_V0
OP_0 30c52ef0554941b58a206d4e5fda777145636c09
WITNESS_V1_TAPROOT
OP_1 166aa68ce7570a54b08aae1785245a4ba280b7eb78126cfd27c83435dd10c6ab
P2PKH
OP_DUP OP_HASH160 4ad22f87edf49765583fd7bc1977eed792a78332 OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 e4d142e2ff278c3328450358b04abd43306f52c5 OP_EQUAL
P2WPKH_V0
OP_0 111b0dd90434d91322e7b85ceb607bb59c989df8
P2WPKH_V0
OP_0 a032f450518c421fac9031dd70e6aed875a94ea0
P2PKH
OP_DUP OP_HASH160 6830b42fd977de8822ff5f1d0f95c80006c7aba6 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 0b65b560a2f5e5297794888fb443f908cf1ccacf OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 73773ea12275e7bf06cf198b52553df374aa4c5f OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 cc84189286b7e5da46e5b5ee5c0d29c05c7699be
P2PKH
OP_DUP OP_HASH160 c1feca9e0d4bc790497a4f2629c9586892916d1b OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 e7f695eb463afbdebb24f6fdf9603f7e60cf138b
P2SH
OP_HASH160 be0b58fb4fcdd25880915e930e519124e3d3aa57 OP_EQUAL
P2WPKH_V0
OP_0 829955100031cf0eff9ce86adce08de7e30730da
P2WPKH_V0
OP_0 e15e4113fe2c9d44cc3a6b16098aeecd85b9d64f
P2WPKH_V0
OP_0 d180432db4f4f176231887aa3e5be06e29b88fb4
P2WPKH_V0
OP_0 e0bde1e89d229f5b646b91c17cbcb965ac74ddce
P2PKH
OP_DUP OP_HASH160 493081b42d5fdaef0649220faaf95e5056a494fa OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 30162f764db732cd8ff442a856feea06df3a14f3
P2WPKH_V0
OP_0 3c21d883c8c0edefaa2fe2dbfd83982e75cc4040
P2WPKH_V0
OP_0 af116ba9a211966b35521f8ea152f8405652f771
P2SH
OP_HASH160 06bf31a1b2fa66374dbb26b3ce89f7055d79c2b4 OP_EQUAL
P2WPKH_V0
OP_0 d203cfa78ef907656f854b5ff016100468d8baef
P2WPKH_V0
OP_0 9bae2cf801895b254fe12496c1c6eb106ca6216f
P2WPKH_V0
OP_0 d587a42a404de1340dab8c705b27ca4c5017ab0a
P2WPKH_V0
OP_0 2152324b5855d20e4f99b5688793f263c38bd4ce
P2WPKH_V0
OP_0 04ed38acba7493facf571251938427cb8f897418
P2PKH
OP_DUP OP_HASH160 c6747b73bea37caba23a5d5a1c14aee4c2c281ae OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 4c0f802f48837129b5872f8a9ea15795e254eaa9 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 3fd29d8c729684385171c50a171a8820f381442e OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 d5145776dc154bbce387b38d96668081f3dc66dc OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 253bb960e867b0d38c2631c482f25f87e58e8bcd
P2PKH
OP_DUP OP_HASH160 a2c23a6833ba9d710728baf32189fc91960523b1 OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 5815aa355f480579939144c97efa5ddf01418bb0 OP_EQUAL
P2WPKH_V0
OP_0 93a9e3a51b5902923ebe38376e3a5f2a8491c5f1
P2WPKH_V0
OP_0 cfe85ebe23992466e48aa3a76603ef40dd8e5242
P2SH
OP_HASH160 5d03f02b4bba8485092498dd04fca525ae9be129 OP_EQUAL
P2WPKH_V0
OP_0 a4a9d51a5a29065d0b1730ce0a50132a8b4411cf
P2WPKH_V0
OP_0 a9db08a623ba16aa7df5da3a794988831194762f
P2WPKH_V0
OP_0 9a66b1e605b1a29c4b3d0fbe88fe882a4efbb64f
P2PKH
OP_DUP OP_HASH160 f6cadf4e25fc9c9355ff1bc8f179213ef573bf68 OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 d8f744f72501d4f74f55f8ad763d3b4ad8353b72 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 6ef22946d83fc377aa325b717ddf3f7942367445 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 0afcee03474a87223da117dc9b0bcafa8c35a9da OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 3ae26b126984cbc261b6a4f3f60737525b2a241b OP_EQUAL
P2PKH
OP_DUP OP_HASH160 aa1ba82d45b67532afbd37d54c3545b9ec08071e OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 ca4bbc0725269ec04fa0a9acc0dca91a47966925
P2WPKH_V0
OP_0 4bf2feef296c1d30adfa326628a1fe223fa831c4
P2WPKH_V0
OP_0 db72ae5106ad34b305fe1853995cfe0b368ff35e
P2PKH
OP_DUP OP_HASH160 c26bc1b27068f089949851df47e10683edef0c67 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 acfa5d5647e9d9b220deb1efb2d6c8c924d9b436
P2PKH
OP_DUP OP_HASH160 f59231c89d037817b95d54743da19cacc464a290 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 2b3adcc406049a0634a17a032160256da59db410
P2WPKH_V0
OP_0 ba6890d56c8273a4f8f91eaef76a5a6c762b5eda
P2WPKH_V0
OP_0 280c92842c05100f67590e34e092317ac6f1d45b
P2PKH
OP_DUP OP_HASH160 278af0339acd97ab36bc87fbf1788124ac7a3a6d OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 0613010b127b1ded54d92f835cb6b51799360fc6 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 02af9933afb9243c6d42c9a1f17e534f2dfdee22
P2WPKH_V0
OP_0 cc3362be5353153f3d7b567334340a9087fd1be4
P2WPKH_V0
OP_0 138ebf48a5b1af157c81a178a8727b0bce629705
P2WPKH_V0
OP_0 d34d6451a309bae61531edee882c96aa95924a1a
P2PKH
OP_DUP OP_HASH160 ec9f42b806b753b1e73be4fd036ca6f68fb088bb OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 c80f8a9b197257b366fb642c452f2fa1c89bda83 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 3eb92b69e39ff46d20eb900c20c114b90ffd53b2 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 151485c7cbe3a6c6ddd83ebc1b597601cd72c691 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 af61d97db3c6cc4e82e28622049ffa62bac64c4a
P2PKH
OP_DUP OP_HASH160 ec3f18ffebb2a4805b945b08cbbc9f7c3a059fb1 OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 af60e2bcfc326ec70e518dc8feb2642712fd39b1 OP_EQUAL
P2WPKH_V0
OP_0 8f9453c4a66fc730cccd464363e8b9cb3050429f
P2WPKH_V0
OP_0 88903f3e4d4f40734bd49f200e7b2e2706f733b7
P2PKH
OP_DUP OP_HASH160 e74b98363f3c4e42fa75c44cced3afbe841f3d95 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 f8d6a64599f5784693ec65f406dc09cb508f781f OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 86ba745444bdce06fca61b6322af4dd7a77345a1
P2SH
OP_HASH160 2665c537a0c7a9bab4a6b37ddf0568c977697b03 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 594a8362fbbcfd0b1e14fff0ff6be9f14e007300 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 0ebe5ce04209010514144fd4bfe76051d09580c3
P2WPKH_V0
OP_0 008bf398db2f78f763ae07cb7260bb4f1326b621
P2PKH
OP_DUP OP_HASH160 a2361c411b47a8e09e8f68d4ddf832449e596f38 OP_EQUALVERIFY OP_CHECKSIG
P2WSH_V0
OP_0 d2b0d6bebfffd1b7f08bf47ce774fb7fd006509c32bed0e42c690358d05c870e
P2PKH
OP_DUP OP_HASH160 2107770b1324605ccb24cb9d141c56577a6ebdfa OP_EQUALVERIFY OP_CHECKSIG
P2WSH_V0
OP_0 ebd82ab2f0e749cf2383f17ab2817e7f795dfe1ee6b7a8a5f4eaf46e058a6e3a
P2SH
OP_HASH160 c4ce5f5fb258100f39f4ba564e417c21958e7ba2 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 d9b032648e7dc5f6af684bdcdccbb0199443a367 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 b454c691e17c1c33de7d29f6d6a5f22d57531a9a OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 be69eb26246cb2d95d87cf1bb7fd71d634c2a94e
P2WPKH_V0
OP_0 44784cd64afbbb964f5bb4873d1cddb623ec13e1
P2WPKH_V0
OP_0 8382708b5fb86232991d278df15f9437a43ce60c
P2WPKH_V0
OP_0 f9e1d148ac4feaf559fd2b51062fb62d59e1cacd
P2WPKH_V0
OP_0 f9ceee7ff782ce227ae27a60403dfd375bee8de1
P2PKH
OP_DUP OP_HASH160 844bbe13d6e2e6b37f5339d1cf791ae014de8a7e OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 46595e256040db916fbc6fd53124a2b09e1fc430
P2SH
OP_HASH160 c188256f97ecdb34a8c29fb841e57fc0cf2c5aa8 OP_EQUAL
P2WPKH_V0
OP_0 fa45c04599effecd351334dac2983a3189f7d4c5
P2WPKH_V0
OP_0 0b7783eedaf936218474104f509ceea61914e1f0
WITNESS_V1_TAPROOT
OP_1 e6b28bfc82c736640a207e08d48d6dc54094e4e526ca15806a46b4cfc7b788ed
P2PKH
OP_DUP OP_HASH160 e1c68c9c89b75d64cb6371b117adee783047e740 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 31d8b30d2f48b44d278022d8251917e27b22b8d0
P2WPKH_V0
OP_0 72139683ccb3d9cf444d0ef54d9212ffb5380911
WITNESS_V1_TAPROOT
OP_1 3a1ac57212192689d5744883f85806168d3770e3326e09e2be709b2f343af72c
P2WPKH_V0
OP_0 4349ec646aed93bcab79c062d088c04028a9ec97
P2WPKH_V0
OP_0 3a95d34ccfadfa039db4e42543b086822915d0b2
P2WPKH_V0
OP_0 995dce4c070326817fdffd0795bdd8e16e0629a0
P2WPKH_V0
OP_0 6aaa97d7f7d6a1892d0591e4747245aa8c5c44fa
P2WPKH_V0
OP_0 72dbaea36bd5c4903eb9808ecc422f4257c62f6c
P2WPKH_V0
OP_0 c93a4bb52b48cf4d305b8960c8e3d613c6869ece
WITNESS_V1_TAPROOT
OP_1 b20893008a38d250668286c6d562ecde4ea657229be5b57eb0fcd7cfa296a7ec
P2SH
OP_HASH160 edcce6e9c276af5a3b9c7a9e861f618d40cc6761 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 10c73abc61a12dc61a17231bb586a435d4eaf076 OP_EQUALVERIFY OP_CHECKSIG
P2WSH_V0
OP_0 3caf83f8f45b4d64ee805df536c118a1f84c65762f05cf0b701b22e6122bc0ef
P2WPKH_V0
OP_0 4dae06c5b8bed906fe743c6916cfb28d5a1f9a43
P2WPKH_V0
OP_0 631d675d3076b593cdd05f4ae3215c10439f3cc7
P2WPKH_V0
OP_0 a9bf32ad6a75d2c1b92debcc5f14d5c63b8a67dd
P2PKH
OP_DUP OP_HASH160 6a3bcf9fa4978f6780b8e285465179614d4f34c9 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 a3d6abd0f72f02ebb5056761f5db04870a331fde
P2WSH_V0
OP_0 574e649a61d1aee3fe1849da1153004e943efbcff85ca5f3b358c4a5f5f02ce9
P2WPKH_V0
OP_0 740d449561cc1433f60d972c3be77e2403393a1e
P2WPKH_V0
OP_0 ca113a147ff60cdc0a113eb4624372ebbbbeccea
P2PKH
OP_DUP OP_HASH160 e5963fbff49065450544d7425875d6fd52c0b769 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 ff03601b4e80904b693f2ebecea2f31695c12ab8
P2WPKH_V0
OP_0 3ae82bf66bec8d3fb031431eae1265f02b6a1680
P2SH
OP_HASH160 dae8427f84cf710efb974f940f25bf8e8a899574 OP_EQUAL
P2WPKH_V0
OP_0 417e413feebad5b57b95033d1cd1befe92e78c5f
P2SH
OP_HASH160 80b509f128890f617fbad3da5b193bd562ac4b35 OP_EQUAL
P2WPKH_V0
OP_0 d04bb26a109c216aed082921ca067420a6952a2f
P2WPKH_V0
OP_0 7fbc8487dc53024f75df517c7ac50bb410d3d4e5
P2WPKH_V0
OP_0 5f0614cb59140b0107b002e9cff70d2bb12738e1
P2WPKH_V0
OP_0 d83ed91112b1d3efc03a128c04868951bb85b294
P2PKH
OP_DUP OP_HASH160 b1e8c0bc3ea4c0d6e623e7cb91cf79401ffe7749 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 e9bc08c17f2e13e099213f90315f228a2b133f4a
P2WPKH_V0
OP_0 befc93598401f6a6996f487c5a1b473c686d0290
P2WPKH_V0
OP_0 4d2112599b8594dbd39d38ec9ee0def3cbe66fef
P2WPKH_V0
OP_0 a4dab69a4c36c368a27d1993d87074f6e90118de
P2SH
OP_HASH160 8b8994645f3f333fd1ac5f8611ea9d9f8b5d7f0f OP_EQUAL
P2WPKH_V0
OP_0 ecb1548fb38edf5edadc7e344525b675ef25e9ed
P2WPKH_V0
OP_0 7e494e04b746e54be2967fca4283c6ba08930f8e
P2WPKH_V0
OP_0 b20281ed42977ef800da58cc4cf4f7a4d93446be
P2WPKH_V0
OP_0 c8dd196d2557891b5b288202fa34a67a4123be13
P2PKH
OP_DUP OP_HASH160 7928fdea5c94b7a54345b6abaf2a2e4944484531 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 ead8155e678ede01a105f3d0298b43a194ea003e
P2WPKH_V0
OP_0 aec45aca7a5ad371895abedad4760d0190932de0
P2PKH
OP_DUP OP_HASH160 e245672bc432be381244a59f4bac56a259365e35 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 6608757be38a4f0abb23e65550ce42154cb482c1
P2PKH
OP_DUP OP_HASH160 461c9993f2a813c186a30c2e6031c06f999f3c22 OP_EQUALVERIFY OP_CHECKSIG
P2PKH
OP_DUP OP_HASH160 abae0843e0adc6703de7c724bdc1dc21ca1d7514 OP_EQUALVERIFY OP_CHECKSIG
P2SH
OP_HASH160 d8cb2afa0003d5d671fc478c8bdca6a57f309644 OP_EQUAL
P2SH
OP_HASH160 79170aab43adf9a605492516d5cdbc0f05b538ec OP_EQUAL
P2SH
OP_HASH160 62e4ce091f5ff66ca4bb0c2b845e2006e205eeb5 OP_EQUAL
P2PKH
OP_DUP OP_HASH160 91574c64014b99d9654b1d8193ed1c448e222b23 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 82015721f7046ff47bd9f78620430c499395a375
P2SH
OP_HASH160 3ad20568ae56009489cabb5c6f319e10490a52ef OP_EQUAL
P2WPKH_V0
OP_0 646990b3bc6fcbe23235505fdf2f21a91a5fa25c
P2WPKH_V0
OP_0 cb0e629647941e480771e963537f01014f1c7a85
P2WPKH_V0
OP_0 6e767a5ae2c1ecec24b5bf166dc543e84f75fd3f
P2WPKH_V0
OP_0 268f4d0de530d7cba6d5935b5999ddb50e38a4d9
P2PKH
OP_DUP OP_HASH160 cc9bfe3fa9621ca4414af1f9405dfaeef3959e56 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 3615cfa316187d784a82bcdc1779c5367ff33438
P2WPKH_V0
OP_0 87cca99c2423d5397a3a17842b892b2b1df6f008
P2SH
OP_HASH160 398722107c1b5323fce8b60298aec20a9e4c9cbf OP_EQUAL
P2WPKH_V0
OP_0 efa016219907d1733284c68a2125e7092ff9bc98
P2PKH
OP_DUP OP_HASH160 046816c8963ded91c22d1a386848c5beb7245239 OP_EQUALVERIFY OP_CHECKSIG
P2WPKH_V0
OP_0 6c15a3b531c9cf587533e0b0e2646db6fadda40c
P2WSH_V0
OP_0 248f09166a4455eea07ecc98807359ed72da882686fc044cdc797d9e47f8a5fa
P2WPKH_V0
OP_0 63918f472a7d7c300708b5eaaa3f47acd7683009
P2WPKH_V0
OP_0 e405908e6d81050adbb9599a0577a3f401b0cb0a
P2WPKH_V0
OP_0 195ef629976d84797fa91f4e4ac2140b131644fa
P2WPKH_V0
OP_0 778d5a09dc854cbcbd0c89ca9d39e7886b0507b1