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
2018-08-18 0491d842a6ecf2ad
2018-08-17 821a295fbf2b230d584e5bf81bd74feb0e769bb04ebd89b896b2629b4df7074d 90437c1058ebb52a
2018-08-16 65e0328d1937d448ba662959818e5d5edc4ff96f65930c50d2e73d1543c85231 eabfd4a76e4480c7
2018-08-15 6f60068a1f7166a60e6868065674da8adfd5c20935313638f0f1ef824ad61211 eae1a2db2d4556c4
2018-08-14 5d44190d1c8f1dbed11e00687d028a4f51d7eb51f49f0f12e030b370bc1cc6fd d24f42bb1053c237
2018-08-13 9a0866a7a140575323227dffbbee578456c72f41444b5db5ca0010fb34ecf466 82924c6fab0c195a
2018-08-12 d95ebd4f2fd79c87e57fc428542151cea866830ef5fc648038b8f780855a10ad 5dd7b845537dc954
2018-08-11 1f9b49406a206e57abb7e192ddf4d49180a3142b924df4a79c2faf589d07c92b 71334012c3672340
2018-08-10 4fae5cd123e800620e31fabdf0b69b0fad0076c05f5a4e53ab588bf42491591b a117fbfa3a3392f8
2018-08-09 ff51bcb5e0e25af5d16a2ee10f6c225fa05fcdec4d4dab7989dbcb548183862b 18b16889a1ae5e20
2018-08-08 b7e02f419933aded0c29bd474a2816f68b6de2c102bca844629c115e8e1b287f fe4025d3e76d533d
2018-08-07 c6acb60789899fbf41495e1462c93488ebc07b4b66eb59e394d3c93afda7d946 49fc190114f04e75
2018-08-06 9ee1aa460f7cc00435947cfba6e6bac6dc97605c878c34494a661febda45aa52 35bf8233d3fdce01
2018-08-05 626ab70f8076b5b4d1d7840a8a9d4513f74a0db77cd1e74732479a14a46eb770 fdd4596bcde96ee3
2018-08-04 5751f29ceeca340b0e184527c8e524a908b3e127398bb13456d1bff7cd3a278f ec74ea26cb3dbede
2018-08-03 6cca79693755386ad893b3eb19a580c14d9ecc5bbce8c5b59e2e85d4face4e18 2bb7755e98f1492e
2018-08-02 046dc190bb8861262256888ca022c9151af20257c2a74f1016f429d031b40416 3a8a75992f516824
2018-08-01 dd093208496704861f2c717655bc4c55b10ba549517ecaeb9e7c94877c00fb19 64b7a0c4a27951c4
2018-07-31 cb4eaf4e35bf1f3d144d35f4541db5d240fd012208e407c5ceb6904d21d7ffc0 9af078a43da05ff8
2018-07-30 a07d866a276691142f4cda996d6cc5027261ca2b24ad8b4d8c9fb03b5ba71543 de4c608dc72d6ced
2018-07-29 9ba394191bb16b33e66d35f5e2564e246c0dac22bc6b3cb72338485d84d8e1d9 d379d74fc7c3227f
2018-07-28 850adbe867b223edbd53c56c42a5a27d08c86f50d1e8e26e6d4977aa2129bc2d 388904fa15857545
2018-07-27 7d3d42d2e2e65157279f51176e543ac4c0cb70cea291d9771d2c199b41775104 991422f211fbf248
2018-07-26 6ccf2f47acd5fc64817a2dc09c7b6055c8473f82be1792f7f3990abeec455dad f68305311202f199
2018-07-25 14741c095d3df1009b6bbf99fc59fcdfafb90063e17a785ed4d7267ea6182681 b1b6c85f34d995ae
2018-07-24 16e09af3f30862d2d41ecd619cec7a32ecb5c60ebe1504668b5549a4e11cda07 037bff9b7bb93772
2018-07-23 1e0aaeb4eaef5cb092ba7de3b7c99a8473f3865cf5c35dc457eaa9ff43073b52 1f9c0d2cf365683c
2018-07-22 8ee4de0d37eb9eff7b0714aba6aebd3a5a275a4518ea5051aa6ca9ae69b8f43f 58e3578686975a30
2018-07-21 39570ca3d046d6230b98c1b0cfed7f6c9467d1867628a163d9372d13224fd951 6f6670b2fe07dd33
2018-07-20 04f5e43826264f61e6528b8ec56f4e3ce33a8d39e83647d75c7866c2ec545628 9034c7e8459ebdac
2018-07-19 afe46155674f1543cb0963f94f7cb9287b4c526aa3e989f4728a46fbe41bb799 e06d2d6f0091214a
2018-07-18 a985b8f4f5e15294eabe25bb9dbf40512b60384edb251e662f1886cd81440d9e ab9c58275dcb00d6
2018-07-17 e8f2ebc0e24980665fd782de7c307ad2fa1f54d56fa49b19e2ed8520488e14dc bf91e898faf90526
2018-07-16 f0bd0cc623a1dcb30527a8f0d2a5b2bc2eacaf346346fdde750c732eac318c46 e179f09fa8214349
2018-07-15 9233fae6b51658b700b580bebc44f19fcc749317b7ba7f680cdb1afcd3d40a1a 9b363cf52ba3231d
2018-07-14 465867474ec126db937686b775f1bacd8c5ea74944c1fb8459e9790c1c85875b af627c16aab08498
2018-07-13 dca1ca2ceda69116813638d2f06b9acffff052ab7a3602da9da6895a5c82bb14 598fb3a59293f3e0
2018-07-12 5cccbec7ee080bfb529835e3652c41edaf0dd2400d3e7109030b4c4e0863c39d 15d8c46135cf2dfa
2018-07-11 947bfe7eee8f4710261f9a2c544a9f65a2ae1d941959e016613e1cd4e49e5463 c31b6f1c42e43474
2018-07-10 3c094c3ade8f3ad40280c9b88a40e7035eb84a5636c1dfb74d9d17c17a23c903 1cdb95aa71dda068
2018-07-09 984657792e2146ece71e8590dec4319273f48e785fbe33abc9139092cdcc9fb2 ee4f5d6a05bdff95
2018-07-08 d397a6f4c04bb9465cd949dba643017fb8202672171b84ba9d7b3814580f6cce 2fba19d0aeaa2f7a
2018-07-07 b4c8932ec9109c1769800caac164a4d53a6271e9b1cf26da05d33547b067eee5 1532db9a5cb733a9
2018-07-06 78c55369e0e4fa8f36bfebf83b64666b56f36ac36174ee07e4875a00638fb5b0 9fef1fd99859a748
2018-07-05 1fe9219dc0bc86c599e6788211e5a7c0473ce8d6e20ad5df7f442637f08457e1 d242a9d6294fa9da
2018-07-04 4570c73c5d9456d414d683fbe4534029489a0cb602e36f9821f8dc67f2b784e1 6cdbc096ec97905b
2018-07-03 9e472cffaaf39451e7165de8604784fad20cb37d192079ba6e8dd8dc218dc7af e381a106476f796d
2018-07-02 856937e86ed67c64c6be401d0b3b22c8213103546b84e8443b38af395ea3fe05 ab356a42f0c3b9a1
2018-07-01 259e347705046ded026a1ae4e4f555c83e45e3febda6eba18be56b880b34d1fc a1ce14e5c37acf77
2018-06-30 5cbd45e3cfe47685e3a19fdb74b4d76d64a3cd86636ea900065a197f86adba39 16a07ebf7f7a94d7