Provable Fair

All rolls on BitDouble 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
2017-02-19 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
2017-02-02 bf87a647513731d10cca4cd498c33463b00427c9151800c41bb8964be25bd3c4 f3d41903d8dfbd04
2017-02-01 0c40bf308babf9bda96c169a5b1ac816ed26c1e6f561de3438a64ebf9cbc46ea a0c16da9d12112bb
2017-01-31 cc616567d4836c1aaf89499868e52075915540a4e2e49d03829cbd4b4abd1754 ed17e65b49375f0c
2017-01-30 e3083b92c4b8f94eed1d960a89c2f4c4b3eb0d5bb4ace461c3585c93a0a6d579 c020bbaf67466353
2017-01-29 81d4a7e179633448936df5061da361f75754c9246c6b9145c688b7d2e5b7859a d6d91f65a58dd1e7
2017-01-28 1cdebd325e663f25052e9808c31455feac6d32417c8c90b916e2909bd149d722 54033f2cc99dcc50
2017-01-27 66821547bbcbdd5faaf0e69889519604f765b433b15e0228241ec307fed1da9c 5dd4336ac623f717
2017-01-26 622e90afb77734654369cd89d9ab773263d3ebf1c589c82018c7f27c227c6d19 a19dcd620c07a20b
2017-01-25 d812dfb19f8848f76aafbecf6b51b0ad97e90cf50258fc4664aea93a1a6b4732 629af506572205c5
2017-01-24 c57e4319599abc26aa17dfd6702865bc4e379f369662c599a3ebbf7d275dde6e b6ab283319dfb2b4
2017-01-23 0def08c38f67e7c3e46fc8a144ee2c449ef5645835e64d177fc78831b5ca3014 268cb312834567d2
2017-01-22 17cead9f46763184ce3315b26f3737b1109492b500e782839d5669f68466cde4 c2fc0fc4081cf5a0
2017-01-21 9276c9596f3ed89ede8e56453cbd9ba0d10ebc9967c24665ba67b618b5965cb5 9333c161fc9e6da4
2017-01-20 53f9eed0cdce765875ee7b9c30c144da3797a5e9064903f45fbc80196830ab39 bba3636a8a9f6576
2017-01-19 aecac0860207bc6c5c4de384f71202764a60aa8634956f5f3dac7409d279a9b1 5b9766a1294f5a0c
2017-01-18 d60daa04fc98b64dd0ab348b9595ded901c262c3075eeb7f7596087c5b829f2c d35d655c1a433ad0
2017-01-17 b1e7ef55c59da201d4549d84a207cbde4daec552f263ddc83c23a8e99038b5da 34db60813f18457c
2017-01-16 7b3efe5b957ebb2a3147134e3df069b84ffda2bf18d53664edb134f3feb0bd64 a775cfba85a7ddfd
2017-01-15 e96de4a7c488ee028723bbfac7d1d6fe0ba9d8c18533acb6d9dfeefb3014b2f9 2dd61241e18c3494
2017-01-14 09fcf0d0746602a362d9d70bddd37b8831c74553c7f9e557b7c0d9e6f0eaf929 2bdd2090ff7d01a6
2017-01-13 8841d600f26879ecd6de669bc18a7a8ad878e377bb0fcac862f2c54656b78448 2e2dde71171cf10d
2017-01-12 bad13c4db104c19447606e965424ea1f17fbb27948423f2ae3412cb5226b313f 641ca9f72d9ea5a5
2017-01-11 8682abaa76ba8b59c2c65de65048bfcb0ba303ad0a55274179392167dcb298e8 544d824ae054fbee
2017-01-10 4f5f1b5914fd3a25d7d09d61e500b93a7975aa092cfd669b650aeb7afb9ad8e8 24309e0a5d7baaf7
2017-01-09 2b7c4c715a9c6e66e608c5bed6af470ff1f91552033325798527fb4af1599d3f fd55a1bd109a318d
2017-01-08 e1008c76c6c92fa0d9e9cb96ff541e0cb1892a69b179b3302afde6d5fed9c4fa 1b30b5fe0215b293
2017-01-07 6f58ea2300ed1ed685a9119af26188d651a58d7df22ce750924dd06bccc0643f d618efa111c9563e
2017-01-06 17290108cd20c1a9b206651344731af1e04c5f0462b852e6d83d6cb0e357389a 76dfcfd3d7c8a7fd
2017-01-05 8e5766494da8aa7c1457bea5578b8fc6bc480e5dbeda7a88894c2a49bb75eb00 3db2c87ff611884c
2017-01-04 420a27acab0abcfbf7a3e8d931f02abb20a678599b930de3b28e69c1e4e4b2e3 b51b7198321177b6
2017-01-03 3d724253e729153033f0980cb600e1eb92c133d30313cfc6005900ad0306b873 da17af123da2990d
2017-01-02 457471209be4a94bd6d2066431c670bfb96006c869c6e58057fc2da257729e30 efa470eb726e943d
2017-01-01 792d1e2f0c95ac2f6d68ac398a78428c4483bce5c38db2081b27f43e43e877fc ab0125bfdb691e58