基本信息
witness_v0_keyhash
witness_v0_keyhash
witness_v0_keyhash
OP_0 c59ce8254dc1e18ab43afb5571ef7a4bd9d6b320
scripthash
OP_HASH160 8f81236a39b3796b9174c74a9399e7c20a7a7883 OP_EQUAL
witness_v0_keyhash
OP_0 df9caf7c5b5d1d70cb4f5d9b3c14ec7ba8e6509d
scripthash
OP_HASH160 df234c5076c6d86a6e52bce7d32c64121550fc9d OP_EQUAL
scripthash
OP_HASH160 f937282181760696766852e4c67e44394959333a OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 c5b36ff0d575af366069e3ee96ca5d420e91a1ab OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 e87fd32211c5350dfa02cf2b3be8d7083c111ca8 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 a4693cc5b3534cf0ae724edaac5148a373fa686f OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 27d290467ebdf8f9751e8b39efeccfcf1179451f
pubkeyhash
OP_DUP OP_HASH160 88e157a96f21f00a537a50d0763222730ff336b3 OP_EQUALVERIFY OP_CHECKSIG
pubkeyhash
OP_DUP OP_HASH160 420168accc402fb63547ae85a1e2c08abc6d9745 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 5c3d1add5b0843abdbbcbae7ef232122b20e6948 OP_EQUAL
witness_v0_keyhash
OP_0 831309cd69b9569ae6b3d9bb97437472c78fea46
scripthash
OP_HASH160 50be3eaf04685578b2b019f90e0bd0801fcd544c OP_EQUAL
scripthash
OP_HASH160 ffdb5f3445a260f4f8b8dd9c083f3b5d64aea8bb OP_EQUAL
scripthash
OP_HASH160 f1e345321dd08977efb18917de3fdec00abd92a3 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 5710a44bd89f22448f2a495c11d57bb6eb7ee72d OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 8c10fa21d342c405c12c443fb65885e277e2745c OP_EQUAL
witness_v0_keyhash
OP_0 b6abe445314b83b0c95bf03ae4a74364c9eaaa58
witness_v0_keyhash
OP_0 4dc9e7a5ee3ec4f7d1fff59a431b55b3a65b3dce
pubkeyhash
OP_DUP OP_HASH160 12b552a838179b1459942ae1d8dd2fd8d2efdfc3 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 e1efe6c51a1be4263753c5b32c3aff8759b08c59
scripthash
OP_HASH160 9da2ff8004867a441f2264687dcc2fbd1af981c0 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 fdc94c9ec73d0e832929f83f7c304e19de669890 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 6f7a8cf5c126b38e60633469e6135cd42607a616
witness_v0_keyhash
OP_0 ab40f525084d85cc823edb2c6052025d0500a7b2
witness_v0_keyhash
OP_0 7811c37110658d0360031881068faf85302ddf96
witness_v0_keyhash
OP_0 f762f98592c40eb6d7b2284e62389c1051b1b5e8
scripthash
OP_HASH160 2883ea48dd274dfc13d97717fcb46f4f5c591404 OP_EQUAL
scripthash
OP_HASH160 abc03f901fba9df1e44c020a3e9f8061561ff7f6 OP_EQUAL
scripthash
OP_HASH160 03354d8e177d42dd938508dd19cb7c3e26841e0d OP_EQUAL
scripthash
OP_HASH160 071eeef9ac5e47940a68c04fe85897ec9e4ffb84 OP_EQUAL
scripthash
OP_HASH160 c874fde7de0e7364c8023d48b3e307a6a1cab9aa OP_EQUAL
witness_v0_keyhash
OP_0 255d43e9a9c7cc54a0328a2a4bdc361b5543cca9
witness_v0_keyhash
OP_0 924b7a769fbe88058479747029eb85963ca25d74
scripthash
OP_HASH160 fdd07b6268ebe954d5edc4f1720acdc77e5627d5 OP_EQUAL
scripthash
OP_HASH160 478fb2280477f3679a8fc936e9bdcb1a7c5f98f0 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 3f09537b97cd19324f6cd0a9b1f8a80bcfd1db8c OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 92c2c5201b78c812d889a2ba180a575e3cb40cfa
pubkeyhash
OP_DUP OP_HASH160 ec8273bbf0913f11b015b56d0eddb671dba5f0d8 OP_EQUALVERIFY OP_CHECKSIG
pubkeyhash
OP_DUP OP_HASH160 ea53352e65bcfdca80572f57589c20889240e2a3 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 c74a7f7e23e743684a7c0c5ca447300818f5925f
scripthash
OP_HASH160 5da2510106dd25af5dd0bd5592e9b7460c49c84e OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 a9340437e2b13cab3270b0552156cb912d2d2215 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_scripthash
OP_0 c7c5cc7f37d7bf273baa9c50488a2dd51790d694cacb910477e02131f7d5512f
pubkeyhash
OP_DUP OP_HASH160 4b9bbfb3847f70d703a2e9d1e195430ef060bded OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 a71d2c2f4db3c9b251bc9750bd70a3aea2a32a49
witness_v0_keyhash
OP_0 5a7d3476cb51435b3a5e409c496b1694fce61f6c
witness_v0_keyhash
OP_0 7cbb9e0271191ae0cf993745c79845163c74c1b8
witness_v0_scripthash
OP_0 8b0897c0f8c6a3bd25ba1dd6ef068869bd4b4c0a2110eb845c251c421c60d83b
witness_v0_scripthash
OP_0 fea94e3c3e8814a19521ad74b9cb539aace350cbf4ace2ec9ec1201a2b3c81dc
witness_v0_keyhash
OP_0 8a816d37a8988ff1151a368a540a94a097b173cd
pubkeyhash
OP_DUP OP_HASH160 54c55327c341e9a085af1fdbd41cae41b6f35b28 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 cacd7b322840868b124836b3b25e3e4d9152d39c OP_EQUAL
scripthash
OP_HASH160 dbba12c6e83edf7cc903141bffc11216052f85f6 OP_EQUAL
witness_v0_keyhash
OP_0 f188ad98e8179f1ad1b36de5b6ddc1c7a434ea95
scripthash
OP_HASH160 9010f528b36843c4fc343dcea73ff3c37849454d OP_EQUAL
scripthash
OP_HASH160 a622feae1f2ef687a84fae65df12b4300623605b OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 1e88f0fc4b8975618efa389abbc8741d104fc00d OP_EQUALVERIFY OP_CHECKSIG
pubkeyhash
OP_DUP OP_HASH160 953233eb14a455cbafb56dd9e73c2049e1ee7447 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 077bd750c1b1d703dd4e4f63e953be1de58a5e9d
scripthash
OP_HASH160 962cdbe4b812f51d3ea44b849067dc15445689b2 OP_EQUAL
scripthash
OP_HASH160 4f7ca3208a02e295e2d871f762712a75bac725b9 OP_EQUAL
scripthash
OP_HASH160 833666b92f8531e455c8f42fd51673c1950f1309 OP_EQUAL
scripthash
OP_HASH160 1b110d2277a73359db9b3c2d009ad68ae39e52ea OP_EQUAL
scripthash
OP_HASH160 ce1a4c6c306428e8a79e4577d3bf86ff7e86a838 OP_EQUAL
witness_v0_keyhash
OP_0 7a1e16e99f87acf7a3d0a9bb6393da4690e4a754
scripthash
OP_HASH160 2f948b0607d99b0b10630c192361d1cbdb6910c1 OP_EQUAL
scripthash
OP_HASH160 97249f76a81c2ce246309664cee89e579ebf7862 OP_EQUAL
scripthash
OP_HASH160 16e4192bc4a09f177d81b49c5122f5851b5c3574 OP_EQUAL
scripthash
OP_HASH160 37ffafcde89f121d49df2a9603356cec6fbc06ea OP_EQUAL
scripthash
OP_HASH160 5389cda113fa520046a17f7eba4725a543c1754c OP_EQUAL
witness_v0_keyhash
OP_0 ab116d5a382eb7633739d8eb05995726cde1e5ed
pubkeyhash
OP_DUP OP_HASH160 0ca107cee0ffcf493d0270e4688003e2ff684566 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 273b7654a7771a825db2cff474424e33ec228928 OP_EQUAL
scripthash
OP_HASH160 3b225403f477f3099012dd9bad5971d63558c7dd OP_EQUAL
scripthash
OP_HASH160 b0b219e19957c256f31b2cab1ac7ee2413eb23e9 OP_EQUAL
scripthash
OP_HASH160 23dd2de3a8c2de3e5d50ac47317b95632af6c51f OP_EQUAL
witness_v0_keyhash
OP_0 6a5ab57ff338ba6eea375e03e70acd0d4c39cf28
witness_v0_keyhash
OP_0 5f8409e8956e7d2418d10029b0f8bfa0a7bf1719
scripthash
OP_HASH160 bbd0628fe949722ec12184ff825cac2f2308f62a OP_EQUAL
witness_v0_scripthash
OP_0 18594a1eee1a7e23892426a226f7fb639cc052b186d1b1da1895eada13098beb
witness_v0_keyhash
OP_0 1cc3465f274bfffa06e1d67c0bdbb37dbe505f90
scripthash
OP_HASH160 c31211f272285ac821135aa8e41fa203d70bd949 OP_EQUAL
scripthash
OP_HASH160 8810a6c459fafa1d0d748223ae3b60f8f4932c3d OP_EQUAL
scripthash
OP_HASH160 eecadad1561ed64f01ad31f2bb2b607573461f50 OP_EQUAL
scripthash
OP_HASH160 5d530fb085b7ed185842c3864e7664fc1482f0d6 OP_EQUAL
scripthash
OP_HASH160 b84b198c3fd73764bfa9c2648c8b81186b235110 OP_EQUAL
scripthash
OP_HASH160 a9061f55a447ac7cfcd0543506232f4f85a1b50f OP_EQUAL
witness_v0_keyhash
OP_0 d9e5838fa6fb7e69f87ad4cf3a4142beae147316
witness_v0_scripthash
OP_0 2f1c31c2cf89983e58b4322a15b8bd3ed7456aca38b9553de5a3a1599b05205d
scripthash
OP_HASH160 e3dd530626578d711af8f121865b3162e8ae6396 OP_EQUAL
witness_v0_keyhash
OP_0 c74aa99a674d6eb1a4f50fb2fca8781e5fee0092
scripthash
OP_HASH160 f9930139ac9e42fead6ac0e75e362041877470b2 OP_EQUAL
witness_v0_keyhash
OP_0 136eeba11ada55da72db154ef87e0edeff269801
pubkeyhash
OP_DUP OP_HASH160 573d7eb05730a3ac586c64811e821d67fc4ae4aa OP_EQUALVERIFY OP_CHECKSIG
pubkeyhash
OP_DUP OP_HASH160 25b009e670e695d250461f346f4758c80a920547 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 4787d96201ea6159c85457a70b280693402efe68 OP_EQUAL
scripthash
OP_HASH160 6094d5047b51c300a0d6bca941c02e5fefab662a OP_EQUAL
witness_v0_keyhash
OP_0 ddf8a4cc50d58dfc5cee0bdcccc4989c419660ec
witness_v0_keyhash
OP_0 034eed1608c7ee54016daf888d19f13143e7d58e
pubkeyhash
OP_DUP OP_HASH160 7b3d39d03e30f57c39200d049b528ea97f213ae9 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 be5f21e616ee8d2e5aabf2d0005f072ddaacec2d OP_EQUAL
witness_v0_keyhash
OP_0 0f0a78f15657de0bd44cf7019913e322f61b6dbc
pubkeyhash
OP_DUP OP_HASH160 e5f19384f3b5d1c17d04f35e0fab207d31dafbf7 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 bf585955e838eedb742af5fb7283fe2291c1452b OP_EQUAL
scripthash
OP_HASH160 4a26c28e10d2a4a10c0056764894f3dbd39586df OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 7d3b9033e3e7bdb2860573846c9df87bf64dcfec OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 431b4dc3be9289b5aa4324fcdb343b7188cb33b8 OP_EQUAL
witness_v0_keyhash
OP_0 759c14dc5bc45379b17bbc69c5bf9f22264ab904
witness_v0_keyhash
OP_0 2e1bb3566e10462e5a57a08cad3e320c33639127
scripthash
OP_HASH160 299040114ed95b4d171f3fd99ee31525fdb941ef OP_EQUAL
scripthash
OP_HASH160 120ad1af5a239fc5b48d1d79949627a417695cca OP_EQUAL
witness_v0_keyhash
OP_0 7a1e99ed8d7664fccc1ac26118354066bdb1cd20
pubkeyhash
OP_DUP OP_HASH160 0ce506069aa93bea3987f3999cbce9920f9d8cbf OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 aac9ccc77ee787db0873a82da6d8c4dc2f336ed1 OP_EQUAL
scripthash
OP_HASH160 00f4d32fa2bd02facf5403e6f126e68c010b3fa6 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 4ec8323809fdf6ec0939249963b3dd08cee55b08 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 c4b6e2d2f983259b831fefe0b39cc33817c1c99a OP_EQUAL
witness_v0_keyhash
OP_0 cb679d1e6231affc1731bf2f2dcb3656adb8839d
pubkeyhash
OP_DUP OP_HASH160 5c7fc8f53270de8759abc0e37d81a7cfbecfd86b OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 117c149de914ffe61802346f46e8edbf349b95e2 OP_EQUAL
witness_v0_keyhash
OP_0 ad036b797d912fc0e9bc38858677106c83c1d542
scripthash
OP_HASH160 ca9da8ee93fcd7a47d356345275922078e89beb9 OP_EQUAL
scripthash
OP_HASH160 30dd2a0952a46b107f053a5dd93b6f9c65d4776e OP_EQUAL
scripthash
OP_HASH160 ad03e1792ca56ae93d9ce2195c39cd18a2f8bc17 OP_EQUAL
witness_v0_keyhash
OP_0 201005cab111c4d1c577de1b3a90d9d6ea7b0b11
scripthash
OP_HASH160 a4ef634988c1cb77af0832d083dbb3bf2e01bdfb OP_EQUAL
witness_v0_keyhash
OP_0 3cb5b8e336437c4b9b2e7e3b4af0330a35453bf9
pubkeyhash
OP_DUP OP_HASH160 826ff73c744c66ecc1a542f02a0891ba38b2a818 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 ef39981cda4bb24e5490e5a8bcd6cbdb7d69b8c2
scripthash
OP_HASH160 cc062327d4c3e76b63b2845001a52110341c4ba8 OP_EQUAL
scripthash
OP_HASH160 62613eb0c114d4f3dad656ebc5772064238d0f08 OP_EQUAL
witness_v0_keyhash
OP_0 878a537af30e5f5c12f1d9219cae46f59f4715dd
witness_v0_keyhash
OP_0 aaac9842dae09726b9f803932c9b61634071f1f0
witness_v0_keyhash
OP_0 c74a99382e4806a50b5044963286ee169b013cf4
witness_v0_keyhash
OP_0 373329b1931ab618e9951bf7681eb52e1b1d56aa
witness_v0_keyhash
OP_0 f5abeb18127ece119480801e438dfd6cd8e672bf
witness_v0_keyhash
OP_0 0f070cea463704b410e43689b9e496cf09dae34e
witness_v0_keyhash
OP_0 1a51050982050d8b8e62484c5fd32a53ee33cd3f
scripthash
OP_HASH160 40c33e6ec58d4e2ea97ca9187334097b9fb1bc0e OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 1edfe78527fbc7c25c46780dc6a0b7d3f79d464d OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 61fe5fdef27d85929fe82fa6b274b1133325842a OP_EQUAL
witness_v0_keyhash
OP_0 7819e425fc7f3c569ed6006e765b8f95537ff401
scripthash
OP_HASH160 c585617b01dee9a242f1304a534343e24b55364d OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 1223a88888c40e24d89d016621648360858d8157 OP_EQUALVERIFY OP_CHECKSIG
pubkeyhash
OP_DUP OP_HASH160 51778ed45cc5713398034bf56fdf3a826488959c OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 087302d9fb4e08adc869b5c3e7e33ed7d7b052d5 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 cad3e761f4ab5b7f206c500ed823923cf5880b81 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 a277bb5748a7364f97dc1a26672dde645dd5e8c8 OP_EQUAL
scripthash
OP_HASH160 b71cae04ec20a730766e8c86c09818611db411e0 OP_EQUAL
scripthash
OP_HASH160 de1cb5ef12e4393019018747bab4836886d8f8d8 OP_EQUAL
witness_v0_keyhash
OP_0 4e0acdf9751e0a3dc5f73ad7f5f3afc4c8a6882b
scripthash
OP_HASH160 3425e91cdaab2149ca43820fe7f9e1a4f9477c20 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 3ad21b9527fd73230ef7e24f919cd160f3ed4cf3 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 64a36586831fa1dd283605d6f17876008dea3ab2 OP_EQUAL
scripthash
OP_HASH160 64a3f70ece9bdfa3defb9517b5404994842a42e9 OP_EQUAL
witness_v0_keyhash
OP_0 54e612f131ac1e71948984bbf98b467cec84cd8e
scripthash
OP_HASH160 73a5b2bbcf53b4c1964a91b17fca18502bb7a330 OP_EQUAL
scripthash
OP_HASH160 5982504cbeb77d1eee30a67bc41546c8895ca562 OP_EQUAL
scripthash
OP_HASH160 16f66d3f458416a2aee537b52d4efc6d23e6c0b9 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 618b96ee3e42e6f7c4dd57d87afa7662d2022d4c OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 700fa280fa026a8a3e0896ec1463222f1d16c31d OP_EQUAL
scripthash
OP_HASH160 4442b3f206cb932698ea9e233e9c0b7514f3495c OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 4aa3977aca99313d439bce5c6e5310d13a0884d1 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 6b1678d5b3f017112b346daeb36be6e72199ddd7 OP_EQUAL
scripthash
OP_HASH160 87b688a7581dab3d916cadb9f02fafc5e744071b OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 84db57f51b980b2b47e586a2534be9429e8fa3bd OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 52f6a13a0be79b47fde453f83b5d494b986689e8
scripthash
OP_HASH160 c0098b32e03bb4cd301b9d5f02487c93130f954a OP_EQUAL
scripthash
OP_HASH160 b04fa848bbe92ab0fb288c53e12fff038a46049f OP_EQUAL
witness_v0_scripthash
OP_0 feed95e2d168116cbbab36bd9e95af64c5ee8db7805ec5ee236c121e6fc3d02e
scripthash
OP_HASH160 bf8c9ca07b4d2d69377b5863463de0a28579363b OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 8591e20880a36149e82a326cb5b306de7bd1a43d OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 adfd6b4ed04df6a941af84a0cb7a0a3ad810d642
scripthash
OP_HASH160 7a4a1dc18c8c1304be7d92fba5ac906223922f14 OP_EQUAL
scripthash
OP_HASH160 6c2fb6a50ec0fec83aff0dee364a8298bcd35e30 OP_EQUAL
scripthash
OP_HASH160 1257ad0ce69c06eac86e887e1563bad1a07b8b74 OP_EQUAL
scripthash
OP_HASH160 b3e235963c1195c3d7b7666d7522053df96ac7ec OP_EQUAL
witness_v0_keyhash
OP_0 6f2b808b675e475ada7dc748e8ec9d8c765bd2bd
witness_v0_keyhash
OP_0 45c88e66fc58c7d8e4e6be0e5d2c02b2faa15aa3
witness_v0_scripthash
OP_0 e2fd91e66d83ec092a87e33a9bdd88cf8eeff1d5b9308760d73eda9dc422b976
scripthash
OP_HASH160 0518774f815ce0316fcae50ea514f7614e97e8f1 OP_EQUAL
scripthash
OP_HASH160 18f7a12354552ce46381c077b4b12c03d717d8b4 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 6265b75a7d96bd0091c3ceb58f062bd5f6ddaca0 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 e349afe03c887acc8139d54b93a95e741f852c0a OP_EQUAL
scripthash
OP_HASH160 c482107d480e1123c2d83ff4747e18d868216d8b OP_EQUAL
scripthash
OP_HASH160 5f094755c0f6379c9a74665367b81fdbdb78dfd6 OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 6e158f50e12a0f768fd758299614f2aabcdfd255 OP_EQUALVERIFY OP_CHECKSIG
witness_v0_keyhash
OP_0 a02f4935938ebe0ab0b9182acde03ec1b816373a
scripthash
OP_HASH160 2c428dee9ef5fe1b27459f2a3bca8a23c160bb39 OP_EQUAL
witness_v0_scripthash
OP_0 27a4d6a33d4623c1f880355d4f4bc8ee17e53f8449aa97633076be53cb8e289b
scripthash
OP_HASH160 800cf9987ea98126715264975371647a068fcd8c OP_EQUAL
pubkeyhash
OP_DUP OP_HASH160 95ce0f256b4595e73c09c53f067644b826ac9f10 OP_EQUALVERIFY OP_CHECKSIG
scripthash
OP_HASH160 20854f22ff7db8a58d5edf5a79f00fefed61a7d1 OP_EQUAL
witness_v0_keyhash
OP_0 c2ac2955413ebea2ba0b1e8badfb28ea966ce32a