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
2017-03-24 651363b26a64b226
2017-03-23 0ac286898abd2abdc198925907cbf817d4db04c3a7982144e5a8e7d0b36d2c57 595c27c4c0f4b81e
2017-03-22 a1f9d5239ba39f7aa9548cdc9cf789a42b583501edad74ca852ceb41ad0c8a5e 5d5da575c9fbd2ff
2017-03-21 5e68a1428ae804d4b764ce5344098894526651744529fb09ab62893a9d63bd3c 00b946d1cbb79352
2017-03-20 b60c64746f824b8222eb421d143756c1e953820bc0bc27c4d7490d9fc6b93f83 045f1234311b13ce
2017-03-19 4cfa81e47400d37719e04f026df1e89400a4b7c487646da61876e5d529db0082 bef1768ac0d94858
2017-03-18 bb1775de44c0cbc46dac00338d2dd9c2097f7d11c86767aae6eed921af9cdbb7 a70294c3c4f4c01e
2017-03-17 b7a1693f889bdddd0805274d8df4531e44aa64e6dfc5f2f6f4fb6cbaec34368c fd68f94bd280806a
2017-03-16 c48c146a6e2a6696750c19ee8620ed3ce3ca6050fd7583e0ae976efd6d8b5dd0 11d6276ef06ce077
2017-03-15 f76d308367dbaa1b7c12241d849b072390d619230bfe5ff15d7c53f2c52a359b cc779032d13c5a46
2017-03-14 732ea653f3298b1ffba79716056ac6ea14a84a85ffb4106b6648ca36c0d34300 c66d63cd69ca1441
2017-03-13 43192e90d156d8461b23b56e65c79bf2a1be7a54b92d49614a69a276a43ebf0f 927ad7e0d3b497a9
2017-03-12 f4ff54997f1bf46bdd3aab642c43052747665ca6887325510f01b2793c09a2b0 f928d8d81d9923a6
2017-03-11 2e95af5e87479ae22dfde2077ce67917d784ac4271e44148130bf2383eb6f95a ccea4b5875d53b22
2017-03-10 119a91b029604cee32d98dd700f3926d280c1f732adde0a0339e7569b20c131a f16c8aecc8bf2ff4
2017-03-09 783df434d8ddafdda7459e81a43aa9304a4cf33dad7dd6bf884eec3f635278d4 a6c3468e16de39b9
2017-03-08 be5ddbc5aa83a2702eb9e1523be6c7c3b8d0376f845df857cec7afc3b7246c79 aff82214f4075f20
2017-03-07 f2ddbea28195f6a1ee16b3921889d18f63ea23faa719a6af6af8ee6dddb68251 8e14b6a763da089f
2017-03-06 e7e14c37bf14773695da3a7c445ddc94aba21abfb54804569bcc132fba8d323e 1773738bc1255fa6
2017-03-05 4eeea223f3f704640f599b4de98c098fddcb61266c8de41ead2e4f89e634d270 c22c3215024d312f
2017-03-04 67fa86c2a134593096f0e0ac25503540b122423ba5df176cfc0c2dce36d62c1b 17337782a412c40d
2017-03-03 aa6e2e64e8a4260765131c56dc941daaf7646cb41114517d1aadc06d496152e8 cea89d5c79982989
2017-03-02 59966d15a77eb8508ddeff21fc761bb359db1b5fab08046aab7e60d7bc6dd015 6a20afdd50cd0113
2017-03-01 a8ba3962a1b4e1ce0d70b4346fb1c9cf53726fcd0deb800e6fd365317526ff91 ff5713842ddea95c
2017-02-28 c283077156b8c25a402f94044cf6069341b42f50d358afcffd491f63b0257aff b2f6d053d2993f88
2017-02-27 5a01247316c19a5a90c69512c659e19cc943d1eadd88f1d98a457d2cb6387cbd 8dab60246b47513f
2017-02-26 c4601c0b21abad0f4bef46cc8fe91d471b1bff48aa1eb6a8b711e2089ec3863a 53bba9fd30979d3c
2017-02-25 153b86f7946607300db6639f38915db131f72d4ca557554f7b2fd6feffbd1f28 0e92024e5b5e87a8
2017-02-24 ebcdf90b26dcd7ef505ab9f17f06dcc066613704f77afb8d2b5e06601efb5a94 c7c605912cfb3aab
2017-02-23 61809ec5411a01cab8c76104fe3114ea36b99a425c426f77570cbb17880edb3c 0c9dd95db53d6035
2017-02-22 d0dcb9d025c923821320a6274092caa4d028dfd5439c7656db36a5c577b1d8f6 04a11e460262817d
2017-02-21 e8e6046f0108e9630be556bfce83deee1d5dfc3258f3fbf995b4ed9c423211e2 a71501798c62e799
2017-02-20 2f11a2c9b9a040355f88430bba0d08017849f601977865112a2c6cb53da57788 b0bd4050f228566e
2017-02-19 3c761cfb1c74b1ff77a31a0ebd6d014ecfa78dd7c654d946aee6a4c098755a8b d4f0b9d7bb5a9492
2017-02-18 b1cbd172f5bd77d9fca3822e6f96fdf5ba23ee4d5b38286810277a5109c93aaa 8fd2f7653fdfcd86
2017-02-17 c81070b267ef9c39b47257d68032cefd5dad538ef8a87ccb195d15c6f01f6139 d8e88a635965ea03
2017-02-16 da83774859cbf49638f40abdb652dc0d2827ece636f0c5239b8db36e0a30a5c9 489d876192cfae84
2017-02-15 358e9f87464c8432236f71ff5e74869b6c13375ca902aa7860eb30b1fa92574d 1ba83f72767e62d8
2017-02-14 970ca7a2b184b13aa51d00599c7e2db08e1431e4a00a95086188927d9aa58cd0 7fa66ac662e6968f
2017-02-13 a7dd8e64135c089ad2be15ce989ccb736fa0b1e748674452ceb38f60c3cf9ff4 485ef23903800fff
2017-02-12 8daf3929814bd7a987b10712f347d7113af21d36ccfff65e7216957175becef9 9285b5829c341858
2017-02-11 965f6ef79b011c5f9e42d6eda105e8d9fde357f08611a1759acd51f4da450fb2 97e7a390307c9ff9
2017-02-10 f0b6da7a54031e3a527f3b002e5d2887904d4ddde279e97d2d9b2a90bee5098a dfa5871b84323dc4
2017-02-09 bb8f720c8ad94b04d73ff0cbb20e6d43203b98069f66763c626bbc82c87b6f11 9eaf4cdeae1012c0
2017-02-08 7663e0b8e3bb4fd21d95ae981c12d37af0762465294ae76d3920215371049dd7 ecf2774fe18e6d74
2017-02-07 8cb5513070d0d23be11202079f67b3317cecd82f047305bbf0b6cd3c2d5f8c3d 4fb3bbdb03745011
2017-02-06 33167a99d0f8d6398bc1622522f8c9421f6c6f7d8fae10cedd663fd6eba06808 506a81e7e4e6d444
2017-02-05 d95778e45cfe4a4f8a62be58b2138c7971acda5bde03a6562061dc51263bc858 acd109e461567706
2017-02-04 61d2d80d59725d07f5e57bcb155afca91dd6deacd2f31ea709338e0ce9be2ce1 5815defe260cef7e
2017-02-03 d336be513e36e7a98f7a329b0029b5c5c0632f034d6d4d7910cee60fdc1ebb1c c751c7f813605ce5