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
2018-01-23 698a1847880e9fbf
2018-01-22 9bd2918651dd631f7fec2a0f72b92f6323262c48236ce9c69dedd1864442c0f6 df024683114b9ce3
2018-01-21 c2216f28286b85ea08eea8ef6f7c65382a46c36bd39ab56981f93898b0ce163c c4690faf2e708768
2018-01-20 d4d6d5a5b4be148e034a39b799c40211f3e8641e3ffd448e23a0b9b2b315847f 62d962cb71a79011
2018-01-19 27ce5a85aa77fd08ccb145874b80d8d0791168f159418ca0e20201dbe1a6dadd e27c91718b5bfd45
2018-01-18 1214f919787a38b3fb5a020f1b2791dfb3da1311cc7f014aa14220e54614a8c9 5e7f43fec81a3392
2018-01-17 6ff15641e5496c933ec5e0226acb274d3eaa4c60297deea2a9d4d52c3fbf289d 2cb8374d503ae64f
2018-01-16 9e78fa143d735c3e6971c4c80ecef61b4165faa9157e3734d2e3907153f554ff c51cd97e37b986c6
2018-01-15 201f543fa7b194bc60f5812e189df12f9f923de16689badeb8916a4ca9fa9508 7220068fe0d60b21
2018-01-14 c604a986ac3ead44fcaf4e2e68d3673da76e988cc5cdf78dd1ed40306b4e8126 9feb15891aa1ea54
2018-01-13 39c1cf14f033c47cf0e423aea08690ad395fcc5dfeb5ac3f9a8602bd277d2e51 c6a9211f4cc758c6
2018-01-12 86e16b5121aecbdb588f9c5141f1e7698cb0c187a1ad4835c0e4ed94c71d6467 e12f70e740454ef7
2018-01-11 a90f87f62cdee300d7607401d09737a450daa5ce8044134425f8c73db8b12630 66d9c25292380130
2018-01-10 3056bc6569f5e6b0bf5f572443a665da444e74e8e3907a022b5de543ea21fdad 9a1df69bb82a512a
2018-01-09 9a4ceb42b241e66e877b7a91289f728a1e3fbd312bb34fd917f628f49da2d429 d85afbc0b0f81f95
2018-01-08 8f224012dc4ff88c7e14652c215b47354491c735dca29dcaeb32e61857766da1 d461f88716275b40
2018-01-07 23355d507e26aa3407341557be7539fa46760031f0ab8563aaf6915de5f36590 c286567aa7153467
2018-01-06 86ea94d388229381e479bd0332090afb893fd6aca74883062c51146022e1eafe 18ccc7b5adb5e4ac
2018-01-05 20089f65eeae132b4fa91d80ab4b088506d0ece8a624bbb3cd89ceb3afd7e676 2b8fc044380ae876
2018-01-04 00b6ab8654668160c13814f04b9116a21f4a94b724f3a73629fb2559b3e9a704 2879facdacad2483
2018-01-03 a1396dc2f75b55922ce383be73ec1e634cc392b124618ae2f6573111581825a6 c1c4a941ac31aedb
2018-01-02 44460076ab6a5866eeb5b8dccaa46b2373ce15fec92c0a1da78c6a7bf7661019 b5feac4289f17714
2018-01-01 fcf913e6bda13dfaa457c3212e061fe8268d0a0c88ed0342b9d83afa0386eca8 71d0401bf5663c7b
2017-12-31 4468513db4367a677be4e3617bf4a315697bf118a99206d4c4bd2854a1fb54a5 9d73d4d37ec270d7
2017-12-30 3d5f16530c95045aa703288cdf8b4ac6cf9d35d15bfc68a76f3f5bd96051313a 36fb52adc1b442bd
2017-12-29 661c6a459fa75c43682c7f2a3a61e1ab4dc1301c155a7ee8f725b15f9722d096 72c5fe72264d41d4
2017-12-28 ef03a21ffe6e638d33f5c39f65d420300cf82bdb5a4e083e892887171a515129 cafa5fc88d84d7e5
2017-12-27 5986fbd66cd6033bc85acd4e98f4517f93760c87ad7ab0c45f12c95ce4301abc 24445a9cc7acdebe
2017-12-26 cf93e10d0bcb565f12be5d973a47ce5c534eef0801d7168d50640ddc23a64bce 731b2c2c1174f143
2017-12-25 69023aba2867e8a3f7821f7cc0fd708bfa36dd8602f9498b82469cc957a39320 0627ed81309aaa2c
2017-12-24 d70f40904acb41ac6edabcdeb7887b5f9c71b5b93a4cd2fa7b28b272ba7e8693 184fc860c7f86c39
2017-12-23 bccb411ca99ed8783b7879c2d18ca75d586d68fd37f42121532ea44b045fade9 2e359d461362d687
2017-12-22 bac0db82d6feaae444c66b9af657fbeca9c84f59c3cdd9611c58da57f65a09b9 ec6370af3e4934e4
2017-12-21 25a6ade3a53e551caf9d2114cf66c6b7ce4e090f6264b6e4ee7f7b4686465a3a c2d810118f8725ee
2017-12-20 bc6073fdb92f1f3628870ac35b500b07a95f1796122b83c6088941a0736851d2 f513d3c2d1febd3e
2017-12-19 ed9a4535803630c867986fab448f7a71bbd23a59440a5b862a6aec9572c640a8 c35433c3a1945d04
2017-12-18 1ed8593b9c98fe55816facbb59d4f91685b8a1975ed2e65bb8d79bfc4847967e 6355bb6d2b5b2207
2017-12-17 836854e540887f247f9c6dad66a34867a16a208c39ef9e0c464a2bb907fe1ef7 121d106c2de3b3fd
2017-12-16 58e47466e9d5fc8bbb303de3c506189016753c0034b2391714d7827d54ac1131 4f0b9f14886c1817
2017-12-15 fc17627b88be491bf80d40f261d946a3527ff285651064f60b70589aa534d121 b8cf447e5c36be4c
2017-12-14 5f442ea40e0d3d21eb1e2b475fdb622efa6ca9ec17638703c66dde268a5eb165 24a39eb4a9e5a34b
2017-12-13 39f84fcac051d53aa15b4bcb652e74d8d8e9e955c514437e7395f63814b09328 1ee909ae33e68bc2
2017-12-12 7621783b7001de28c73e5cd2b2c107504ffa42a62ecb77fe73c09227499a8862 bc9dd8afec123dab
2017-12-11 7b4fa884575f892df675e62d8405b622499f1dda97dcc86f67bab50fec579eb6 67970cc98e563e59
2017-12-10 c327711f4140cee006d3cd8251c848adf185e07c6672649ef872ae60d5ee537e 8c8cd02df28ac6f7
2017-12-09 6848dc0e22a4bdcbd9eead72c18ca2eeb38aa6701eeac3304457df60ec0622c0 789ec626ef7550b6
2017-12-08 1459fe69f13195d498e520e49c0af7f80b96abfa46840396cac55df66bfa1795 a3996c0997dfa0c6
2017-12-07 4f3e11095b80e7e5e7c1fef3d1720b54a6f16a08eb6d148d5ff17699de344fc0 4aa2ee5eb4c5d5cf
2017-12-06 05e459c221398abf81320756b70aee8e7654fe22776d787c17d737a78ce199f3 d726bcc3b65fc481
2017-12-05 436bcec0cb0f0073f7bfb25b74b4a4aa96482b07e20b5c00de60c6d406880831 d726bcc3b65fc481