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
2017-05-28 c4f828e59b7490d2
2017-05-27 6f1a1953f7c9faf963fba412009e898376122bdb662d16c1ae750354448f36ee d7c3a03a224b9a62
2017-05-26 551bc5a665b4e416e4d7446773e5ae4383da65d63ca0a044811a383da531b4cc 1f5d328061aed4bb
2017-05-25 4709dde9a183f2079ea7ce5a996b60bd69ec30de8f62aa69d89ac0f495b82f9f 74a65b66cc2629da
2017-05-24 c59c2766e200c2ffa5601b2de5c046585395473eab93db6a64aa661ce2762713 3e307b1733920368
2017-05-23 6d64815b0ca4b4e13bbfc787fb1552bb71b8d73b18add4f4f2c6ccc920ad8a7c 6cbf2e7375e884b4
2017-05-22 26e18991d70e6a871706375553d5340fd621082e43dc41afe3770321f8c4f32c 474acb38e01008e7
2017-05-21 f11c0ca8b414e9006c3b1a1f77d2a29b9b875cab5ee17be0f10f625331d717f0 f61777f1c0d4e27d
2017-05-20 b1ecf9ac037bdd52da939a724d6b1a8e4d50fc29d801af04d51a38721e1605f6 b4053f1836c5e030
2017-05-19 cca37383d41bbab0eafd62f218f2629efc46519b91325312cf78d722ef8c488e 362650a487d2e9ec
2017-05-18 ded25c352d704ddfd0307855d53f38dcf6128b183f44bdaf968b1c0c0cc4bd50 49f75c28f70b3ae0
2017-05-17 7b70ea9b663b49be219e0d58098bb4724ae6cb8659246291f76198b3718f8698 8f8ee4bb0624107c
2017-05-16 c7eb2e5e5e42cb394b1abe151934a02414a2b16ed6ebd36303d91094331a051a 01e50adeff464c23
2017-05-15 2f75a3f924984d3446a6e3773c42cc4ade38ea3ce4da684833622f78327784d2 d30816a8b689dcd9
2017-05-14 a63928c188e0806bede4cd2a9053068123f80d4d86ab9fde5431470f8a671eb0 cc9d3ab2d7fcfefe
2017-05-13 c00cf6c65be80999890a5b2c9b3df34f06e95c3881f0cce8c6445d15ce26b0a5 1392ff78073e3b5c
2017-05-12 c376ce0b466bf403a851325a44d17b4d8f1d1ee5a2efa96e07afad5a2788791a a7375896d0336154
2017-05-11 c58fd4b39d07730415c5f74ff7bc7d306b2568990f6ce2f4ef9ae4f0b0745e25 651948c3db206bd9
2017-05-10 29016f68da07a81c36563193936f338ac6856ad134d647f090a577623e6a3a03 072dccbee2bad9b3
2017-05-09 0dc86b9ea621d5db3f54269a750f4b361a04cd015f0cd0fd1794d3f219c0949a b601910d52ad18df
2017-05-08 de0a685ba53bcee68bafe2d891b18b614d355bc82d671741378caa113cc03c2f d8fa1b844b49c941
2017-05-07 615b7d31e53a451c2f2f7f1c7d04488d671621edfc9026d0ee98eb80f2617edf 6082312aac29ed96
2017-05-06 0f678d35e4092ec552f416f3c9c96bc70b990dc275da8d232fc64833ff0e35b6 ad20fb6b151459fe
2017-05-05 59d70d6327e9aa385a8cf692e10ee42378e9801901a3a5e5b6d387aa6381e133 e6dcab3e242e5bf1
2017-05-04 fd93131a9539fa5c966217ae6a29632400e51fcee16c90bc5938f8dafc4df674 5d0d6200364f13c3
2017-05-03 e0bb5c149919ce2d9ceeac07bb8bb4c4e402ee2704f6c845665f8d109e0c8ee8 a53b6162a0bf8bfc
2017-05-02 0f256bc0712abb1a8d5644827506992d7223456f9108b70b1ef80fb0b92088ae c15fc407fc016958
2017-05-01 a11d422c77100af1dffeda8758b85435b4518386ea5e740c6e5806f0d621f7bc f880fc145bf8f778
2017-04-30 de7975895757aa89a2660eddf94d4d0155e88684534b4656c140fdca7333f2c3 158d642221a43f9d
2017-04-29 4ddd00425add28edda6df805cd3e08a19e879245e384fa7c8d693d4ce369eca2 26e0b650a190acc4
2017-04-28 bf97b7ff36f51f149b382e5dc62bd277b7fa525e20fc0e6fee7be6ebe690d930 7aae94c05b9617c1
2017-04-27 7419be18168609532b6622000ab3c72697ab64c9ec286274251c31446617f355 e2bfb03769e8b274
2017-04-26 d38a4a50bc54f1714424a7a9083641e0bd456314b67930587eb5771ab0f242e6 ea1799c444cc7bca
2017-04-25 4c7c230a4de24c5122c0e95ad6ef818e628bbc42d6ef997d08bd8a5e4951553f 764615da760cc7e8
2017-04-24 e67f5eb82c794873d9997dca893749fdbb27086df18c7437ae3d373e6210e906 ab612d194d1b9842
2017-04-23 3b343801a251a8a769c3a780f8b10504f5b1c05de4e0a1070faf95aaa89f71cd b475c59599dcec42
2017-04-22 ef85fb730a17a9bfd8b8b537901ec666427cecb124f1c6cd9d1e221e9b673cbf e0fa70c814329d7b
2017-04-21 ef76e51eb7e1b8c0c6c662584da21e07affe789733b4e420ce8ce2e8db04c196 1c5d1f32f7120a4c
2017-04-20 dd1d28951b51b715c7d1e49396ec1cdb0a00165666bc3e5c90d29ac746f2fc11 bfeaffee05e00f82
2017-04-19 67009a58460423392f2c4ba0df26719d6810194eded87de533a3650ea53ef369 652f4a9a4d7a079e
2017-04-18 49ba6602e67171965c4848a391aa81e95808210c3f4e0104472b6e3d40523444 10b33256f56bd803
2017-04-17 fa124c3256e2979a8d20bbae3ddd5132bdf362beb0e131221cb6250c00750f03 2e6ee9c4078bb6fb
2017-04-16 9f8fbfa8c6327b7595f303b449e681b8b569c47bedc52a654cafb84a3756919d a9a493c503054a40
2017-04-15 dca48ee12f8593ac2d982b5b5f2646fb90886775d225c853200ed5e34ef74438 928ec324aa4ad0af
2017-04-14 186e17fd7ba4f0e80d56b64a92b0e7f449febf1374631a3b6bb9d23a40567dd2 e87ae9bba57caca8
2017-04-13 32f1dd0994274be148f0325fd40d2148f5ba365c18e9e3ed7f6207228c6aebdb 4d1a39db0c869288
2017-04-12 0a8b8e205e61bd99ec3f04401cc84a757eade0fe65b7b2e36b02ad64f4c50eb2 86dd8a97290437c1
2017-04-11 db7354847a37285e58b977459bfb1dabefbd4e565962581b2fbbaade4ba7943b aff90c4c088ac374
2017-04-10 9125f22a12380c26fd2e6fe63da7856e79991711caaa33d901002807bfad124c 890c5785f3b074b2
2017-04-09 7e0062b63ca402fdc53ccf7fcbeb445b578fdad1fc71b3ee3189cc6409d2df40 f6da01c27cb7ad43