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
2017-09-24 44532789edb890b6
2017-09-23 c90be6f48467db8951bc0454138b8327967beda04ca2ec18e5b0424f8fbed56d d69b8966366ba6b4
2017-09-22 eaf05da287aa9c393edddd399373ef8f0854c308cbe26d2399bd087981a9645d 08e5bef0e1b5d017
2017-09-21 9d1a00ad6502e0e85a2ec9e5b308be99c7e72673cc93abdf1d6124b0b8132b16 a7a7134901f81d64
2017-09-20 0bf6a5854eea607ac1f68bf7304c08e969c9cc4085604274b69cda1024f88404 346176385f7afa24
2017-09-19 16e8805f0be0ee2371fab64b7fe5e7f90a34c7fe1b66d32e3ed52d374cd8170a 52dc0277752d377d
2017-09-18 6f49c664e803e013b3c881898be1a46c253eaeb0dd945d92a4a446e37c872be1 6392fb8ab2130267
2017-09-17 a68a37c7759811a7ccd208b0912f241cea182565aee2bba87c01b85651ed4c6b 839f928706cf756a
2017-09-16 7aeb555935f4e52a509835fa7bb3e02ce237e7c34439e05dbf7728de4e2e479e dcae96d462537377
2017-09-15 485960fc50b3314cad6fe7baeec5f890bb23328ea64da502a7534d209118d77a 79a3f5270e3d2089
2017-09-14 06254935b6ac07b4a2f088bc38e1f17ae6575e09fd9ecdc6dd6689a40e3a2faa 4a87faf199137f69
2017-09-13 e7118662cae1cbaf33b5164749d84f1d1123e8f0caed897208b88234c5768941 b7a6fda0719d08f8
2017-09-12 5db2bd2510fd71bc9544fdf93535ba24913392b4cf4666c53db9a3705c46e341 8c63e68d84d177b2
2017-09-11 e1f1003641ded2afc30671d69d1c962f78e3aced5758b822911bb631cbcf037f 805dbe9a43824bef
2017-09-10 1b85e3901d2c269d3750945f0409cda0f294d5c0942897ad692316f6f0882f2b 8585920a50829d12
2017-09-09 99e3c76ff273d519c3917c1f6b8a590b36cd58ad88d65f0f2803f9d36b6c3f07 2055f98c1edce1a8
2017-09-08 49cb09080f30a62710a7bea3f58656fd175a60ad8e46d1db65bb731b43c930dc b09295f4117c7b3a
2017-09-07 cc6227166e4c95f92385a0bd35e662db5a06fe863c522417c8a012dc4015965b 95e241e71d51b7a0
2017-09-06 3e17e9d755bcab1ac6c1df865b427ccbebae63c9de8693f87311d738da8d0cea f6ee66a60879c657
2017-09-05 f53bb3b1325660883fe70bb08c7aef344feaff5ae1530a867a9c330ded15ca23 320657a02b30a48d
2017-09-04 9a0afbf45f1c0cd876acab9b9a2298fdbc6cbf83475123411ead1fb637e65ad7 d8f15a2a4b9dcb44
2017-09-03 2dd225b8ecd7480a5ed031b70c39fafc5adaf2e825d3933f48d3b1a26acc685f 645846a4b0e13813
2017-09-02 a78451aa7879e043d073e009f80464bbc972965d423eed5e761bda00e5858b6c 606103e7d4caef56
2017-09-01 c5d1c815667686a3f934c913bdf553d7f45e7336d85819e63d0499b837994dbc 83064cb56c6c3e1b
2017-08-31 8d6319f3bd10ddf1692c763f6b8c717d3df18186b9188e2e224f61c13ab3f81c 5fe4f90a35a09a0c
2017-08-30 be7006bf4bc751af1cd0958375dcfdff73bcfee479593e45445f1743cc9ef703 e6d85d962028df58
2017-08-29 b6dac39afa5793d9ff3338340984d63f92bf4f41fb3be1e4defd7d72aa14af81 0ea30c333005c8e5
2017-08-28 6522f7f8366201b8d746ab29a29a2fdffee41cc7afd269a41d6939c0391cf331 dbc86fcd64c9d7e2
2017-08-27 8bf32653a9c20364366b414161ddf635b31f48281b23296d889d8135e6bbb6c4 f000589cd740f491
2017-08-26 8ce3a1b005df1ebf1045845cc8362033b942a61d039aa9d2ae336cb675c5e3dc c6bafd0de09c344e
2017-08-25 4385404e9f1ca33ffcb0080e23d800d14dac10e8c1b21e1a80da43c0173b16f7 02a2938b732c0aed
2017-08-24 0fdfd152ae671d5f0d2e6760ee851fed3088457c15d6d5122b6cdcd3361be2a0 39d59514f71d8f6d
2017-08-23 b7e9c42ed1277b3227fddfea3a63442e6dddbd997b547228df4c9b6a24f9b509 e956e74a950962ab
2017-08-22 8155535e5473c4f38e3aa221873ff511ea6939b038dac0cfcff0eeb99539c7d5 4e7a379f1e15ea25
2017-08-21 a03d4b1ee7c185848a58e4ca62403cb93f3cb173516774189e14fbd256033254 bdb5578d5a988e52
2017-08-20 be4e565df64cc4aba8cc2d35552ed9e6c0bf59af24435326f8b9fc524345b7b9 65edbb567e5e1da8
2017-08-19 f65fa16f537e788c4b5193cd70fd92905ddeef731ce31b7636df73e5fe91aec7 e1a6210665cf4424
2017-08-18 06a1645f9bc661707af22cca72d31ce38759c4c233847d055990533fa416e576 a1f56cdd8805154f
2017-08-17 fac6f4fa81597dadae3b7530a9c4896b9d05ae48543657ff5acced3ee7f3561f c6d289f3fd8ca387
2017-08-16 359983981736caeb163afbcef1a529154ffe6343fb8cd9fcdd3d7f66244442a6 3336da13c4e2402b
2017-08-15 8c2adc2060b381d434d82b048582f00ab3a3be97f1c9019c67e10b9b7703631c f8de02d3d90d04c1
2017-08-14 ad798faa1d187774cbdb26082dc123e5c52a963cb51f71eb3c94f5ce54b9dea4 1e0e4c89086df777
2017-08-13 67e4e88b0107c38960f05ac25362ed042f624927aa56bd1584312c86cadf469d 39d6f8269893fb7e
2017-08-12 f579f003e1866b09502c3d8ccb97dfa953fd3727bdad6251f1966882eddc45c3 02c53e0fcdfc43c0
2017-08-11 0cd9944863cbab09c8f7c29b1b19edf84036abeb9983a3bdd3e27dbce5389cd5 459f3a31fb45e0f6
2017-08-10 95f8691c61368908bc16eb5c4668166ba17203496ab7a05ebeaaa19d1946e55f 87c02e873fd054f5
2017-08-09 d45ca46fc03f09ac40dc89ff87c1fa25719022db0b29b851282d399e912281ac a98ab2174f352688
2017-08-08 91fd44a3ee0f24c577a9bb4c8fb67f2e620cb2a618e87dcb3ff589a96f4f401e a6b476360de77e58
2017-08-07 1c552d0f89d5f5d8289de46f85ed0f78b3871a7b2260b7486708e686600ab6be fdb8067ad5b3bf1c
2017-08-06 0690aead91b0222693583a53b855aafeb89078dbf3a7c1719fbaf862ba5e8aa0 7c97de4227fe796b