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
2018-04-20 b11718ffd977fddf
2018-04-19 226775a5d8d12333f2a6d41f216fdf345f95cf04f42f55c1ee069583809fc920 824073b9ac67ff06
2018-04-18 e1fe92ab373e7a71ccd3641a024fb408f6682a1baf321f4e31fbe916934a5021 762063bb2ac8207a
2018-04-17 965c9a48b91b9ee8e2486ce11e03efdb662e90c5bf9d8ce6c2c0d5e11d7ecd4d bc4d019e49dea1d6
2018-04-16 1b815860b691010dbc6c8e6f82b4b15abdcac972e0848ecf8928954146768918 fe2a31dbb1272026
2018-04-15 1a26736a145c2434dea738bd813ecd16df1ac7cb4f12b11a75b6f8db63d6bcf9 d2d3b40eb708e53a
2018-04-14 682d0cfea29f3c180b882aab74d3fe28b231801da8740e44688c4885d140f5bd a6e9b0a3d021c522
2018-04-13 d3f5fa5cd64ac98ad22a2dd499a9145a14971e616182562fbefd583bb3a41f9a fe188a81b6132751
2018-04-12 10ffb6c41069d24aef0f13b8c2179e29e5aa304bb780abd2da1159a46156ea96 f65384b0576dee71
2018-04-11 efa833ef9c4d34b6542f1d8015e597667213090c3e753cb8c318e870b6d4fbbf b17881b3e6287e4b
2018-04-10 a635ac4fcde7720eb0130bf165197c94cfc3d4ed476f8a50c24d02205eef61d2 8e5d7c39a76d0dca
2018-04-09 28c536a82996c0971c4b23f9bba3d79f3fea6c8cf99476e2a2a48a58f0e9d6ad 07aaecc4b474bc0f
2018-04-08 e92a8b83a5aa75ed54d6a1b439f045beb965658b86ae9852dc6b7880b791cdc5 2166468232937da8
2018-04-07 ab47e631f7a8174e13d071e928c50b9fd95a62bd675858bb5b3291d8c962545d a1fa44c8baedb5ac
2018-04-06 38aca87d580cc656da8532a2e0f2deccddbf6e1212d60ee8ab57ef0843ac45b7 cf2b1d646773d4ba
2018-04-05 bc02adca3194a4eef1be328415404e7b17db43df8c22bc79326c98bcaa9ef150 f75976fe94569952
2018-04-04 ee6d750bd23831e3d11355172a996067ca1d3b342ffaa8f948768e2d8901806d 26aaf5a5217ed4fe
2018-04-03 a9809565b66b64e251cdaeebdfcb9b75ac285461b22031d6623d487f602273da 384267a2d825fcf9
2018-04-02 35dad534f5ee142e540675f3ba0f0450001284d2bb6e8e9e15faaa866eace92b 14acdf4598d0990e
2018-04-01 86b2992ca00de89da7609a69ac5240bcfa376f7156e81e4feb122e52717f4993 ced0f7b1d58637f5
2018-03-31 e4b556890ea113448d313bc204cb82610c09f5d05f70cde7f14a753375217c94 d2d86c4fdcf9c4e4
2018-03-30 a3207b74faf8796c709fcbed79e04385d1e0cddb5a321863c38e8619902477e9 5a477894ac4f333a
2018-03-29 2121a1dd8bf5601ad9a489c1f5c3773883f3d385b49fb3ecf45700e4af00e5cb e1e14657ffb65fb7
2018-03-28 12daf06adf6e7c1038fd22abad3178837500bb7e81209e5022422e2fc6e2ec3b f717a2b19494e624
2018-03-27 3e27388758a4289c417bb04858d4eaa20c4b7c8c9461a10c1ec88155a8c8d5b7 fe3a6cebc60ec9a1
2018-03-26 4ec897d1897985d4bbcdcb0d25868cf8599a4cb2ddbc4d238042751bb780afdb 2969df476bfc0b5c
2018-03-25 2c4aaadbe7e1d8bab2ede92fa77715996987d22b7f307724ad09fde087eb30c0 7e5503fcac1da752
2018-03-24 b2a3bf2804b7a19229ded29e4f2f51807f1737ea1c3473d77089a02be7ca603f 71595ac36ada504d
2018-03-23 018d9e783c515a43cb708af4b061497d03a3a245edc8955093b76006960240d4 564d81ba39f2f7db
2018-03-22 fd421339ea120efc09e0b18ef3608a4471cf780a9d5ef05e749bd4e212239eb7 34ad5cdb7771bedd
2018-03-21 1d0b581ce6b1e660a2d30c0203db05a77b91b43e0e37a873f013a00aeda1e0ff 6befeedcf2725292
2018-03-20 fa4f369c483f53d306b885a676826f47a8fb3b6720a8d1cca21b56d89ec69fa3 bab87bdf6586ed95
2018-03-19 6f568541d59cfe6b6493a98f448f83ff7104eee1832dde360a3277d953109b7d 38cca012ef62d350
2018-03-18 379ca9b7dfe821baf2db6dfc23d4e48478fb605c6e65d15df17f84dd2190f4e8 5290e2fff278ed88
2018-03-17 856f765b23914e29149e2770dd8e269576d64cccb87adb698d5263156595dcd1 a872379c814bf2aa
2018-03-16 34763a687bee85e7946a933f8f62bb82c325cf3f203c6e162686c04e8a4bfeca b9c41ca87ce307ce
2018-03-15 1faf2b6a1bf122e3c6e4f6c58937d27419b94594c6fe16d01a7d5ab3c791044d c6374a15a5a6326e
2018-03-14 fcfd77a76cf2c84339ca599af6468f23161b064e18156457d018e1f433985158 1c122806471e61e9
2018-03-13 aa4d36c937c3aa819da6a801619a80f32660cc92be43a767a5139622a219f887 fccd06e1bb326c61
2018-03-12 c52d3b69370ac74bf11c067ef3e373c8e36d3edd0bfbab3beb473744cdcd2138 99e03738f2047073
2018-03-11 c81c7d4ef08b202121fc425a8d6fa10d7585af6054db5690b092ef6044ccb623 bbb4f4e0ad6148af
2018-03-10 075d23f2ed7f09b33356ddc66ef26d61ab2d04bac0dfff45fbabca60bf7cc294 e68f3b7b966dfa46
2018-03-09 3a178f17b0f2646a89d0b1063ce2db8c26651c22c1a482795604a0784b5fa2d9 a331d87b09cc60ef
2018-03-08 21ea4470e9ed710aa31218a0ba4c0783d5b88d98d2c3beff5dffe7dd12a81513 826186b14a8ae5b4
2018-03-07 c5e06fc8317f1a8ab1a92dcbf47f20934b4efd2a1a5da32bcfe57b9376d8137e 7f5c7cddd3157ec3
2018-03-06 0823254e02f18c8acbc5e79c4b5a10448a2fa0129d162e0e7b41ac3ec11795fa beba09a831e914e7
2018-03-05 fc72e820f21455ab56daee761b0a2067ef02b57be7dcf47b478564158fdd8a83 f8011635fb0e6812
2018-03-04 d09d8ae2d7055c209645af5191c52b6c32404cf36bf1abd89a7c4bb968ee240f b195dda9c5266cd7
2018-03-03 af2be275977fc76420d956cd36adb788361148c4cdd132e1c80b7269ca7b0934 9cee4662e6f4834d
2018-03-02 8ecbd02e0ac2665737147941c6932443980defda54b96d64245950991976482e 46f19a8754212e9e