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
2017-04-26 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
2017-04-08 8013a3e35153f0dc935fa860f2d2773bed1097eb941cd2ecf85acca577604797 43b755213583ca70
2017-04-07 6e6cce36f8d8fa126b8b601b41aa41229e7934b945c7c018d910620bba894a92 40515c0a25537571
2017-04-06 20843ce115d4a6134a853acf496485043d46d21c5fbe3686bf2164a1eac33327 80f5e0a25200f63c
2017-04-05 0c9aeac75bd64c1c0e117fa3d45ed50698d7bc27974558ee19101710cad084c9 d63757aae58002cc
2017-04-04 70e36ecff6b662f30796ae250639ab4951ba6ad18dfb03e8040e7bc9b10c1209 a69e23dc9dd27b91
2017-04-03 44b2f66af68db6b18817f0bf8992f09a92f5770f78d759f410d3235f237d304b 6aa2c558c40ec9bc
2017-04-02 3f473ab01e0ee163bd76696e9d0f9eca03f646c261042a28b841f0cab0f7d7c7 6defef1a8ff7bc41
2017-04-01 120f2f4da1183aba26a532c90a009255cf7d722a199d5f48d7b5599fd0e9a40a 09bdabb7be51e3bf
2017-03-31 7de6ced33f7ac2ba4e9786ee93d801780342384e84758a57ff651226edc0b02b a3d2a44a095bf1ad
2017-03-30 4e341d40c57acf7e765d81de4d4272a7a919b564af3a418578558849a61faa70 74e1a5c2cd201e84
2017-03-29 d54cf90ec530ca73afc64042145a8584d1a97060c91da6be77110b0130985675 332ed6362217c6d4
2017-03-28 dd69a21bb3eaa92eb9cdf76f52910a195d1b4538cb496e1e2673083c92df4fcf 4c7a118d16279aad
2017-03-27 9ce83cf3609c861a1b8fded8d4f2d603e56c843ddb65959026926606831a7812 119d57d3c1fbd0fd
2017-03-26 8ca19b732ec6ca39ee1c7378e54d87c0cfc97e4fd74a3fb044947fa891fb093e 96c069161d023ac6
2017-03-25 904fd1b78ba8fda9926900e1b3cdc67c55443504bd87d0fdd13afa30fabf548d f568ffe18df0ad79
2017-03-24 9aac3b82ca232487d3005322f94cb2e81f5512926bde5883061acccbac283cfb 651363b26a64b226
2017-03-23 0ac286898abd2abdc198925907cbf817d4db04c3a7982144e5a8e7d0b36d2c57 595c27c4c0f4b81e
2017-03-22 a1f9d5239ba39f7aa9548cdc9cf789a42b583501edad74ca852ceb41ad0c8a5e 5d5da575c9fbd2ff
2017-03-21 5e68a1428ae804d4b764ce5344098894526651744529fb09ab62893a9d63bd3c 00b946d1cbb79352
2017-03-20 b60c64746f824b8222eb421d143756c1e953820bc0bc27c4d7490d9fc6b93f83 045f1234311b13ce
2017-03-19 4cfa81e47400d37719e04f026df1e89400a4b7c487646da61876e5d529db0082 bef1768ac0d94858
2017-03-18 bb1775de44c0cbc46dac00338d2dd9c2097f7d11c86767aae6eed921af9cdbb7 a70294c3c4f4c01e
2017-03-17 b7a1693f889bdddd0805274d8df4531e44aa64e6dfc5f2f6f4fb6cbaec34368c fd68f94bd280806a
2017-03-16 c48c146a6e2a6696750c19ee8620ed3ce3ca6050fd7583e0ae976efd6d8b5dd0 11d6276ef06ce077
2017-03-15 f76d308367dbaa1b7c12241d849b072390d619230bfe5ff15d7c53f2c52a359b cc779032d13c5a46
2017-03-14 732ea653f3298b1ffba79716056ac6ea14a84a85ffb4106b6648ca36c0d34300 c66d63cd69ca1441
2017-03-13 43192e90d156d8461b23b56e65c79bf2a1be7a54b92d49614a69a276a43ebf0f 927ad7e0d3b497a9
2017-03-12 f4ff54997f1bf46bdd3aab642c43052747665ca6887325510f01b2793c09a2b0 f928d8d81d9923a6
2017-03-11 2e95af5e87479ae22dfde2077ce67917d784ac4271e44148130bf2383eb6f95a ccea4b5875d53b22
2017-03-10 119a91b029604cee32d98dd700f3926d280c1f732adde0a0339e7569b20c131a f16c8aecc8bf2ff4
2017-03-09 783df434d8ddafdda7459e81a43aa9304a4cf33dad7dd6bf884eec3f635278d4 a6c3468e16de39b9
2017-03-08 be5ddbc5aa83a2702eb9e1523be6c7c3b8d0376f845df857cec7afc3b7246c79 aff82214f4075f20