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
2018-10-19 d08573e2f06c2fe0
2018-10-18 8a8d568790a38a53d4977065de6604e0435cf596702a8058d6d4edd98f2ca2ba dc85b490ab0cf313
2018-10-17 7405c00cd86eba6693d5f8cc890012a4085e05eff28a6e55583c4c3dd02d8fc8 2ca0978fe289e556
2018-10-16 80f17845957339275ebf7314a6b6e5deaddb97ff775655e7f68535637130dbf4 fce9ac0bee87dd32
2018-10-15 95df5c957cefbd9b36596acf9dd7310ab4675d060e2315026e231d980fc796ba 59a7ad7413ffe3be
2018-10-14 582813e97a45be3d284c84300653eab645daff852f0e77ccc4afa776fd86383b 65d33890c6b1c4b4
2018-10-13 98b0f59ee2cc86ed3fa5093599ace71dd5f5e825150f7ccfdca6bfcdfa3c1ab7 e6b1b2807016b077
2018-10-12 25cbab9ce73d543903f3e03a4481e707ff58e937508ee999b4bdf5fca70f01b3 f879d34c6d1ac1d7
2018-10-11 272c893db2c6656b6c661bd7c69b1761b7f1c266a6a4e5df8050d36ec6aea69b 825e9ec4f6ea2b24
2018-10-10 8eaceaaf483d22d4ec08f0960fe8284601cd4d3ed09e6f3bd1879d529f3ff501 6dd136a630947b17
2018-10-09 9f4dc1172f1971a796986beeb65260de3dcafa07c451f1df326e7e06b06aa3b2 d92105a0d27f8fe4
2018-10-08 ad120db48e1e7768c65705d960733fd32fd7f18322bff4a4273c2c3f477e47e0 204e3dc04f8a3931
2018-10-07 7d8e7c9a6376b28feec2e9e9d3fe166dba8a5ad661eceaf5fc71414ccc655a32 d42c23ce97a55036
2018-10-06 7746055730fa9e6712b71748e39448f0989b6dedff10429066c4a93f395bf219 b97400f3bf5a89b9
2018-10-05 403425523349205ca2b8cd6f70145137544243c6dc895f05cbbe77f4bfbd9ae5 d8e22a8f83d354fa
2018-10-04 2f5eb1b9b9a71e34ab7a852e2682c15f7de29982b753707ac5a2c7eea8f26ef4 0d4dae0806f5f018
2018-10-03 27ac0cf1ce912c3643ee8c75a66a8a8bf32c50ef2cf25e48a66e75b2063cb323 1c6eda6a5b60e6ca
2018-10-02 204702c5670aa1cb02d8183bf19559e26e23676b2eef968bda66b12c484fbadb 29939d1519f142c9
2018-10-01 c58fb6fa811aad9402a81bd567901aebfa90900c86003cf89556b42172b2344b 276d0bad5d410689
2018-09-30 918a2fc1c4cf08b525812a7351c840907747486fc728880c741c965499eee368 bd1ce6f7503dd432
2018-09-29 89ec6a06b2e57298b840d084a8d83153edc705421312954e4ccc7f109fe8d85a 52f3e65ecfccd1a9
2018-09-28 f6bf39f3de842aa2c5e2b2fb9386c9840f795f4d91bbf56b37459bcbab69f3da 9ad040c332807f80
2018-09-27 b23bd16d7a38e3e0169bf32254ee1e4d6303c810fa8513487f7304519d738543 1ab4903cf66e0ca3
2018-09-26 9d08f8a06df3e690b21f3be3c0cdfee82590a0860a0954086021f6c9fa340fb6 6e4f302fc371ce76
2018-09-25 cacb5cedf04e8615aea857136a86416ef203a7b38f1849bdbdc9d5a49fd78a8e 6f3bae4c478e64f0
2018-09-24 e25830ce2503b0e049785b0dc12ac9d6d49bd59463522e6c0b6f86aa09c72f7e 0610db27b5756567
2018-09-23 9ee9ac9426139957f0192caf1e8bf1c3b254a2fafd4babeaa3e771d3103eec7f ba641c8803dff663
2018-09-22 36f6499124bc059a37143fb458b2a3fb83af9cb276df9744e30c3d394ab29834 cbbd7a6001f1bbaf
2018-09-21 f6f06d5231ad2e185b9802f3602720c4c74b2fc65a2a0ff353298ceb0dcef2c0 a52337b7ec465e06
2018-09-20 b71e7968e8508f0c2755212778e8ad7bea2162fd3d6bb591d3c638e831bfa965 10d59c5f3564c5c0
2018-09-19 236867a7d4b107c58d7074b655563ba97940f9001c24e47644ef63f1452ff576 6e25c799a491c166
2018-09-18 805c2a96e72454369b156586900d7c336a38e3d43c22ee70e5bfc045993d172c 9416076e0b1ce55e
2018-09-17 b9c78945ba65b0d36eb5069959dbcbd46a53ca2fcfd66d4b31ada67f82d27293 b1cbf4131d501e98
2018-09-16 dae047fb2fd298bfd248208769f9af3721ae1722771a3d6605fa43b53278ac63 06a91b6565d0dc9a
2018-09-15 1834d2662b01aa9654231b93a591dde13fdd4e5e70fbe8b9b807ac4a7a833afa 303d2d24b4116ff4
2018-09-14 7974e51405673ce769151f7d33400ff3de88efd5358c798238fdad8243131529 0e7c097dc8864f75
2018-09-13 0f976fe22d33b45d9f42ceacca668f49d9d4aa4676142c2e517b71b3dbcb7510 13b24fe051f0d180
2018-09-12 8dcdb29d3851bc09f511fe95314edbd49f5984cc9b4391bf6efb957ac7755a0f 613a736a992351cb
2018-09-11 04f0b1caa01e268c5ce79225ce240cf55f786c45878aa74fd19c09f2b0df26cf 16b7ccfd85ba4bb3
2018-09-10 cb032339bedb834d2dbe00cae2ec6f5be94694818187bb378dfa7db065fae8c0 232838e9d1b6d614
2018-09-09 d24fdd1ed28712a4f468e239e4f98b77286c4c8296bf5c87202a0d1ee5dbbaeb 616a267b6521938f
2018-09-08 1bb1fd676acc7c56c66fa8b4b27add1b6d77280c95b8d00a1f95348158f5a695 4ca0ee0d74fea9f2
2018-09-07 56cef32bb05bdecfa70b737f0ce5fc0d47c116520a2f7e09a96b007ed9fc042d e710ec2501753c72
2018-09-06 bc50115ff173aa7649286663d43adf10149c85a0e8e56a6a78f1923160abaf65 14b5640f6707cb39
2018-09-05 ca15353a67bb52c856bd0114acffaf9cc56caae3877ad9a17bf7a3bf118f4b2a a612b7a50ad37806
2018-09-04 a83c1153f4d7841ab32d837ef222b935fb5f2682d79b9544f61cf7ab1045275b 9262b800662b099e
2018-09-03 8a0338f860cb74db583fad0a971f3ef679c00835d60c46dc704e084d63cb2d17 43223bc489bd630b
2018-09-02 d1a8d7bea3bab6894d6b0af853813df286c8e662d1bab04ce7d743239f26e491 9bfda13344cd9b6b
2018-09-01 d312937044a39f8c85dbf3dd84f617d4f024e4b3c377db039222c047b101ba4f 064fabc1a3dba235
2018-08-31 42ba65fd7a1dc833fd0208d7e32c43188215645a70d763902ab984129a3519e3 4c4e551fbb0e505e