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
2017-11-17 2f1c752289818d18
2017-11-16 52c67855ed90989c709a604df933fa4f0f3cd6451842edc3dbdf0eecf572893c b50764c497894019
2017-11-15 4429b2a25295cdb07b0c992227cf08298592d9c342f9f6eb696e1736fc0e23c2 dee0af945d471c16
2017-11-14 f01e904942f54439a3911a80a96d5911fabf9f37c3cdf4f9f3366291ddc3ede1 c247738df8181c8b
2017-11-13 73da59d634a9e694601268a5113b2fb06324e66dfcafd015885049388ae31cdb 7e807a115762db2f
2017-11-12 949ff8e3bb6beb14b911e4a1afe6be94addbed01b0e7296a6aab030736e7decd 3d333e1cb5a3f1f5
2017-11-11 680a826ffd3f2bd3a56eca03ce6d00d74c220a1a4cf238affc6555f6cf68adf6 b8f602616db8dacb
2017-11-10 019efc134ae83591f4946cd69aaa2a8fdfd678f8b67e918d0929fc19119eff65 1ccb07d961064ba2
2017-11-09 f7385389d87758f40ba707602aba67a1edbd6619bfeb1b988fda56fa316885bd e75c50de9d509ab5
2017-11-08 451739efbba3e477708292b081c9957a6e522e0cd59b3d637a12dc73aa144724 6dab249d7dc120e6
2017-11-07 92b301560cb588ab16bfcdf9e114253d8f8d3efcb17502ea443a584a31c8b396 db059f221f974c2a
2017-11-06 cb9235c7e8728fd9bb5b4a733755f5685711f0113301246214130d642f61a9b7 184a82980bf84d26
2017-11-05 2efec7ccd0bd40922f200eca2876db505ab8827a3fb2284593e65885713686f3 5ffa38c8c6ea0bc6
2017-11-04 49a6ed2207b14e724a511646edefad7de0b6ae7035bc547b58921b10884873b9 9621ebe219bff66d
2017-11-03 aa6671cffc38bac0867bb97c2bdbe84608d5984d6d3d070988573511dfc46456 c4b4b6482a1eb662
2017-11-02 55c8cacae22e4f0906b1d0c6679afae0b877172f1a5efba45c2c1e656f02c8be 7eee09e310bcc509
2017-11-01 677002618dfed3d3de181f5564263ea6877d83d44f7709e83689f40ad218c3d3 3b48292dd9b586ad
2017-10-31 2f4b5306e2ea34e3e3bda00de731b4190a29f4cba888266f5e0310ac7b66696b f008fa2638e5ccf4
2017-10-30 f8ce4409389663708d74411a9df02e75c1862ce54c8bd8179439c307573f6a96 f3e8b177d7103f5a
2017-10-29 013883fff88b31bc5308fec6df9ca5b088e2c10235c9b1feee6e8e305ab3579d 821266b70a0bce89
2017-10-28 a236fbc693322e6a24ee233c3b0a7edbd024d5c6042d4da64e57fd87ef46617e ccaf4d1e0ec52543
2017-10-27 54c7f0ed89f4a859564d2ed5a30097be855387edc0530a2451d0800dd5bb0449 ffd55c6516c06ac6
2017-10-26 0da5c74683459c861910b8cd8ef2c22b7c4f407014c9e619c20369647266359f 48ed320da7273583
2017-10-25 87d504361472288a73cd28af09e64037bde66294f13c8915599553409ed8ef89 e32263ea63cbe234
2017-10-24 9cc133eae6db9c96c8a3776af890ac02183a7ed5c9465466b74fe69b25f87bdc 914f898f5676116b
2017-10-23 509da10974710402458da36f88dc18851b3371716390cb9aea73d9fc838a13d5 5911cbf08c307217
2017-10-22 cffcd81dfd1d6e4c204cc436813bee65e21ce687842bffdd88450f62f62c0754 415b2b3a283aa98d
2017-10-21 ac2b38fe11266affc20d15928171c3dfd509d1651c613b24956e5904e3792aa8 6dddaa7f2bf2823b
2017-10-20 b3964984238288ed1a6eb08711900607a19fb308f15c7e63da99dc3a09d13fe2 3049bf4f0cce4c25
2017-10-19 7c8cb14421a9e7ae3d8dde501f969d4fc72134ed67d6aac1c124f2d9934f1f6e c4e8502d0e79ce0e
2017-10-18 03cb4aa2ee23fca59be6c1d1565e20a99e4c257a507e3644302c83d20745dec4 eebcb9cd9b19dd38
2017-10-17 d3da5bfbe22b9dd86ad873170fad83ad70d6a20378e480379ef4cae6c9102d0e 0b8a3297abb7813b
2017-10-16 7baeaff2f7e3dac2e2924d93331f35ede675e79933253c193332817c44bb28dc fb203f15d0c4de90
2017-10-15 6020379456f072cb397a7bc7408d8d8cfc6d7035f8376b33d61ec8dff2faad6c c1fe54f299f2d37b
2017-10-14 1e0f382a48c9eff5bc3eed46d8edb50c22174a6046ffb9de47b83fa873aaaddd 3b3a73bb8c1978d3
2017-10-13 bdcaa678e8290a856373ca6a4e782947ad362ab5769a4383ab3f8d5b2c514a53 4a65890f661ca5b3
2017-10-12 f5696b4ff6e06580f2d0e14b558eca646f296bc43f092ac1df5563cccff66aee 3d22a9bc9613c199
2017-10-11 67e418ccb3ddbcd2bd8900812d4a95a3f3e77a9d2460472c11e0d7d76efa44c5 f930b53b6c3d848b
2017-10-10 a3143d65165895b03f5e613357ff06ecb1aa08ab93a5d0957621d016015e2bec dc1afbc72228d971
2017-10-09 e273e5205208246f1213bfc74907217916bf5715b31b9427408e3ad02a6f7ede 8041da6c5ebd00f7
2017-10-08 7c869bdb48342a4a3a58ffc14623e15f5208ddda3f669556e712498834d07d07 95f3a998ff86c3c6
2017-10-07 9de548809cb94bba826a11ab35f8102234e68546326cb2728de0506c493cb26c ed0bf497648186dd
2017-10-06 4c0bae285e8fecc2c39347dce641456f852c20117e2aa8037833a93bc6908418 80e6f3420064b16b
2017-10-05 c3a3fadb1d6f0acff2f6333f6bab28ad752e478f0bc2ae265cc089c1e123d2f7 c3f502c4100294f3
2017-10-04 a5a8bf9dc5dd76bfb27a9ba8bcc8bad04f64a378177b46547b82e657d42aa105 b567d3edf99de73e
2017-10-03 961299467a84ac7223b8ae882b5287fd049cd48eb13176daea72d7764d7205fb 5ca9a1db40309547
2017-10-02 1990ecb88ea2449c075564181bb15e9d6c53fdfb7bf05fd12d027ebe4d5bef50 c016bc574fdaff75
2017-10-01 5e97c273087669a8b9b0dca0a8d46179bff4e539c1f8cc3b4aadf6ddc33b75e9 c9b66e0d850cad62
2017-09-30 88cca2f0f4901f1cfd6e8e303fbb3d826d82340c463e77afe46e832895e9ecb8 f488af72b3e31cd2
2017-09-29 29dc7df805411dfe77c27556ef5bf679418286897d99f3c091753a137d54690f e0cb8a8edc85508a