Provable Fair

Roulette | Coin Flip Duels


All rolls on BitDouble Roulette are generated using a provably fair system, so we can't manipulate the outcome of any roll. We are using a SHA256 chain of server seeds, you can always check if the SHA256 of today's server seed is the server seed of next day.

The additional salt parameter is equal to the last 16 chars of the hash of the last Bitcoin block with height equal to the largest height divisible by 100, which has at least 7 confirmations. New value is taken once a day at 0:00 UTC.

You can use our simple JS script to check the lucky numbers, or code in yourself in any other language you want.

roll_hash = hash("sha256", server_seed + "-" + lottery + "-" + roll_id);
roll_hash_first16 = substr(roll_hash, 0, 16);
roll_lucky_number = hex_to_uint64(roll_hash_first16) % 15;
Day Server seed Salt
2018-06-22 01ec5adb4bc221e3
2018-06-21 0a06c0a40ab34ddb9b025054d0cf096738ce180ef407b6a45beacab5db5947c4 3ce4677c4b7f0c3e
2018-06-20 36ff273a7f556d8bf6c5531fcc447c5a06b088c5e2fb338f7ba0a8dd2ed16690 56de15d5311dbb97
2018-06-19 0687ff61e2baaef9dbd5aa3a6482fa2ab1113f95f05c4593c6f03a7cdef5745e 30465365fa2cd22d
2018-06-18 e60227f5b052a8f49feef18aac6dbffd3b6c1227a79bf57b8c9f61dd64fe9ae8 416e7220bca6bf53
2018-06-17 76b31e05ba1b97c2970492fd78d5ea785e740cb05554483ca2c964b63c107c2b f6a2fe0d4d751b5a
2018-06-16 dd4a348da95f73516e92970d20255d0ac92e45f94c3442184ec096cfb424c8c0 13e3f663fbc1592c
2018-06-15 726f718807da77caf2cf3bcd99e13b4cf9f93220ce7f87b7d14a5ec928d29b85 072c37199a681282
2018-06-14 8a6d78d91530d86a92f1b08c886d19c494a4bc5ef7023cc6604e3184e740bb0a 564d463e1d4a3286
2018-06-13 94a6f5dac8d12a04964ca4ec93fdc3a5164d261e85ffc43afa83e379d0666b6a 98cc0919a9c3fd0f
2018-06-12 9de08ec94dda9228227edb57debc242d71880e7cd4ee7f6f43d35e50a79309c6 93cc4191b91cb1b0
2018-06-11 d0dc9d46d9737a6748d015955c558c52d1a05de78d680f9f30ca27e9e4289731 5a8a024d870e924c
2018-06-10 5c1b62d4afb916b5e54a3b61fe2c023a4e7949e01393449e90c3286b0c201524 44aa4e1d0b228cf7
2018-06-09 6f03e65c7338cff6c2cc5222e5802bdbd144742f96fed4d24e3040cc395026bb 980db761fca5112d
2018-06-08 53097a0a67afdeeb3ccc11ca6dc3583250038fd2f43c53414ff058d442ef8164 7914c9d47a21356e
2018-06-07 b8270bb44f24f5a9d66786e549d4844bb7d61e5f554dd975b35cd8db661fefe3 c2603df506501db5
2018-06-06 c8fab45f4550ee50eb4f1187b2e46cceb2cd4282f1dbd50f211e978b1b1551f2 be0665ad38a17e4d
2018-06-05 1d47dd09275c917ab322814314551cfe00a7ab3007a5a068cde3656fa6576bad fcd706de8821d679
2018-06-04 e8eafa6fa1fee2252d58de1ffff6434c687f0dc5a0fc7dfb950f6ee38bc2999e 5c22f0501a272fed
2018-06-03 e6e2b2857d0c605744630d60497fafc14c74968bc6c06e020624bab9d3433552 01a5880a19e847a5
2018-06-02 0030a17a91e9af16543195b92b7b9e17061abe92b9d5e86605815694260946a6 9467eb66cbc60ab1
2018-06-01 05f40c4bedab8e7e0cc65272656cab970f8ced38be165ee34c97cc069fc42ae9 1c5b25872c0e1478
2018-05-31 a8bb66a93959c5f35d18ddeb06732dce2ae3921cf3d85d766dd77bf636593e3f ce91d001ea8def3a
2018-05-30 6a91bf42f037dff7e7c20548ef4125c641ca4019e862cd209e46926b3ef6bd81 5abd9bb43f8ede1d
2018-05-29 907ed9882d6b011ff107b9c11f376a71bb6174c77bb3001e21ea12a8721c4d2b db6676d7c73ecade
2018-05-28 76df32bf91c909bf3306d721e57da1674d47884b7ad847f7fc0272abb015a7d7 3909970fb989a22b
2018-05-27 7d3162c7b4edf7e27e35046bf03fc05d91927674a2dfa9ebbaf87d9754f846fc cf6ab5726bf991a5
2018-05-26 614853bb6a9a5ed597aab27a2f814d3f0d215b5d1bef22522d16cbfe77fbcbb4 7fcf940250335c9a
2018-05-25 97aa534b657190a46940a62008b6e29a87eb79594c5055de97401bdddf5117f4 6f5d19118c3a22b5
2018-05-24 ff4ba239915593540a29ee7329dba0b2062c8cd869ed697f897c46b3bc7cbcc4 14a7fbf0a4c68fe4
2018-05-23 4fabc4946e7ecbc8e96abf82d4c4155e3324ef072fd9c7e4ca95dfa36b3c9303 382d3ed08227badd
2018-05-22 7625aa3743c2e238e84e7f90a49de61b2a353c10abec89ee998b2328a0572754 b411f273ab26aa14
2018-05-21 56866295e1736f742fe4d5dce9bd4d56b0b93f867132e529ca94dabb2e4447b6 e1dbbed343df039d
2018-05-20 d9111c9cf9f6157b41987f6e6ce642ae73ccc03f60e789a317d93c3157ee9e99 465b543effdccb71
2018-05-19 13cec6e8bb4853047e3f414277f6b89e7af657665f3f650948bbe97cd3a8d50b 1b528e7a4445cd8c
2018-05-18 19fd613f8502910ab5b737fbd13040e77e389d72f3f2593dea48f1cb64570f0d 2ef774bb3f42f231
2018-05-17 7d691984b05015cb40e9ebaef0e98b963e2d0f000b8dcd1a144e36fbfc781ef1 a4ae4472b7a68216
2018-05-16 3be050f6cd0ca33e63290742193e2b85561ba8a46c24799591b98f1142d1f8e8 087bdf200b6867f2
2018-05-15 3e97e9f5b94d8aa0620ef88b0efae85a911448ce4cb23aa2c666d64ee5cc2261 30e50e7194e911a3
2018-05-14 96d151eb220071f13060b7ef101be2d54427e92991b761b2814574e550d9bcd8 4a6c72d16b3b3d32
2018-05-13 3b5ff13cd553d9e7115af6be9f4ecc773ee1d445ad87b4639d0866f282f00347 6b63abee7213f1e3
2018-05-12 67b04363fb671aa435bb677eb89bcf136d096e566dc14d9a3ded21c11a4d5c74 2271ba9427348cec
2018-05-11 6bdb6c3685d29ebbbfccbb28ea1e002cc8c85b2ab22e58d4ce82070364e4b0f2 b2b2a641f6c1d65c
2018-05-10 fed536a99d5518dff01a4ffa08972767b312634464b524433f7c09b0dfce4d54 6911040c5008fb87
2018-05-09 e355212868e06c1012ffe698e57612ea983ccfb2cfac768c9658966dbe73a055 6c05ccd7a692524a
2018-05-08 2e600dc117d25ec8cede18cd5e9773d2f2f53aa6486998088dc802f6ae693369 9c7aa3d2c07df517
2018-05-07 7e9de0d6865cc779f19d34a61806f6461ea153a5d8f5976a035e543fc2b0027b 5024f38cba78dfb5
2018-05-06 4afb6073ef41cf504bf352a999ba98cc3f44f6e8e2c1dc3394899421279877bd 9173cd6c61a488cc
2018-05-05 9ba9662c24e4555ed76d93b8a3261fd6c19e8473356af525516def8801be941d f6952057f9ed8937
2018-05-04 07007881cbf1a565ceac503a09785c89677e2658073e3b1cfaf1c015aea04082 740d2e4d6b46ef9d