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
2017-07-23 966af17abe75d507
2017-07-22 9284f39023b245f82a66cda97ab2f253a60084d9bc4f1fb3439194901650ca6c 192f87facf2e54be
2017-07-21 ce99d091530b4d9926f73f3c9ef24bd5e4039dc0058e779ef874303ac422a111 14ba95726bbf0810
2017-07-20 a5fe560bef9cc84aa2f8bbe2d7fed458c3184e3f7472931ca653f0591d584e90 790ec4e3219bd9b8
2017-07-19 92b853aff3d2d262136a54abd59f120db5a3d58e72f2964e7dd6c687c3b26d28 c855c639cd11e8a8
2017-07-18 94776cfdca8ce768cc9d33fb71219fa4a7f33bff780d77fa6840acd04364f454 f3f69f4b6148f9ba
2017-07-17 a9f8a99f4f040a55d704e5f9430ad6bf73143e4dd6b0ffe8de4df23f151249c6 7fdda8b09b395f6b
2017-07-16 89ffebab9b43f3b930413a4405abc5652938a8389b4040dd0a57046e92e7a846 5d0ee1b9477654fc
2017-07-15 538966fe15b63ae0bbf933b4f8d03e865b3ed50a8aa007d36e150ce74873556a 8971853a1f85d682
2017-07-14 ccc7c1d25a2bc76c27f7e34944897f29df2af769b8c9396bb92215bceb735c4a da0460e348f877be
2017-07-13 48345d2154fc23d74460b94509a2ca8e66176d6cdaff3bd21746a68736a8b7e5 08ff1decfd81f15e
2017-07-12 66a11891cf3e350c3b34ad474cef86cd4f87ebb10ddb4a86f6388fea11a2f88d e11eceaff85a2729
2017-07-11 0bf6e957255de1733ce887fd789f1ba9bbb4be64b4a3965dd7f904d63c6399e8 7abc2171e4997c00
2017-07-10 508a468904a6343dc82f3500dafb76fb7edb67e1bff91807ab5baaf92555c432 f5c9e4cebecde71c
2017-07-09 2234dd483244af45a9c4592f4c965d9703cc385d78129997d35ae63204b36344 2f2272dad84a9ca0
2017-07-08 a2bd78264ee3c599a6175c634ce3cbcb32d0ec98fdbda14b0d5b8560181220eb b8ab1b5e6f90e162
2017-07-07 21a683a9fdd4ad9f7aa616701d2b76e5c1483e973a23efa83314f9713c63aeca 77ae21135af95100
2017-07-06 76b9a060277a51644e496e23691c06b7cce30febcd6d680d009ef03886b8608c ed1a0f3f33f58ef7
2017-07-05 7fc55562bd9d505e43333495408a6915f408b647cbafc3f9fc17b9e232c829e8 3c95b49bec01cc1d
2017-07-04 e02765ff18a3c8867bbe9d20af83127dff42ceec5b001277a44501f6d356aba8 bfdb3c4e03e51b4c
2017-07-03 6944ed91b30382012f43d3933fb70fe4197360710e22f04e02fd2fe7c0f4bb20 f66bfe56fa3947d5
2017-07-02 99327b20682a37e49a0e4f08678005f39b3da75e9413f2849acd9fbeb8877e42 4e947ea8652f9527
2017-07-01 357b5755436134cc34bbb1a5561ff9159eb460983c6d9b4017956bd70be2cb5d 2c5612817b57039c
2017-06-30 9f7baa45e01f48b24d550c409d5c8f29e22b640aa7fb2d80ad804ce1f6b76c9f 8e92f8d5af8b26f9
2017-06-29 5e36243b749f314fe3904a0ca02ea74a0f2b453841274ee5bb259a18d5ff25a8 431aaf5ff545b430
2017-06-28 c9b930c2c24d5b6983aeab27e31e077f6dff854ac2a73648a2f8b5250334084a 3bd9a2c1d08a7ba0
2017-06-27 22ff8aea563b91c3e9818eff8ebd92829a87b80be60cc3262b1deb85d5e49249 1b636e7e5d739e10
2017-06-26 e92554c80c5cb5e151f63e28574797f2cb4c6e3ccd577b53e17f680738961929 462d3ddbf72772e7
2017-06-25 f75d447851861a697add7a2f0838b23d89278d76b92cad34756996851020dc51 6d35bf896595ca9d
2017-06-24 9f8ec0564a229ca413a7df226c964f31bfa085982ef1be35a541e9d698f8fc77 d5a51d46c0a38143
2017-06-23 2deb40d0329035e94505288a0b1d717e8b202809c73f927fa3856ba07b774057 f7124f91488b2e4a
2017-06-22 70985a68529d66982e442a025f6598792759f7b3d7c2527bafd732426afccf97 37b57c704bacf511
2017-06-21 b617ad89aa9cf2a39e951019ddc45761101c98e6dd35b93c3711a922d1ab5df7 9a48b84820a74e6c
2017-06-20 109bc9213a9d99e12d2f1d42d59e23f3f46464955eab4f5567ba0b7fab454d29 f4828036533c2008
2017-06-19 795a4a13f400613bcdf25b0d651f34a65b9c2da59947793509d8df846b51df10 ffd092ecef59d903
2017-06-18 6b04f8e17e6c545ebece0013dccd228bd621d9a6873484fc9694c432d72c9e6c 91373c7aae0b46a6
2017-06-17 fbf1da08bda6f23dd197bb98eedf1542f81e202a5b5873de8b7f93fbd3b0b329 a6bad2a686f9f177
2017-06-16 ffc0ef7ad53ddafcfb7f1f152455aca48d365ce7f3390f4434859b03f616f8a5 317a59dbbf96aedb
2017-06-15 6490a6254e7e8edbc3578e69644d4453410f31ae3d411db1524d62cd0a675b5a ca39478b20b3e6fe
2017-06-14 0104530315b331565d312d3369a55506fda07fef6a0bab59faedac74d0d5feb0 18675358813355f5
2017-06-13 427840481a317284104a179363699f3f08df6970b00353570885b1d1d860b5fc d7e6767970c45515
2017-06-12 195acf4f25bc18d8449ac4f608d971ef2b79fc80d3904df20ef7716022a21ad4 7ed38c5badd6b5c2
2017-06-11 71b43bd5d2142feebb7d769d2e63f961d2183ccfa73e294f602c62cee7c3224f bdf359d781837b8c
2017-06-10 f054654ed271e8f05b7f071defd1c51d092b365fdbc3f85606c7189e6a9ab9cd cd3e72d37253cde4
2017-06-09 66cef2c280025e8443b24f988da0801c17132dab774691b405aa658a5076e487 56af3129a9156465
2017-06-08 efb06ec75195e0761942066bd851b145e180b8068dc259d2792970820c0824bf 97d087318785cd58
2017-06-07 9cd725b290b2a2ac9d0606930773c4e8e17ab500061f3c425158b2a0c5d85f31 430159d71e6d7589
2017-06-06 ea6188ad1022c0f0ece4a1f9f04d9eb808129b7a6912bb18b85893b335c7eacc 623587be1187e327
2017-06-05 8ca72cdb00e01ff4bfcb7d3cca560bf80799666fa356e0999b3c1458710719db cac0c2f831999dec
2017-06-04 cd86fd75b4ee47892646bfb5d886dba19535db1c5cc68666e7e7c89df78f2dde 7c23fc88ab0431fc