Provable Fair

All rolls on BitDouble 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
2017-01-17 34db60813f18457c
2017-01-16 7b3efe5b957ebb2a3147134e3df069b84ffda2bf18d53664edb134f3feb0bd64 a775cfba85a7ddfd
2017-01-15 e96de4a7c488ee028723bbfac7d1d6fe0ba9d8c18533acb6d9dfeefb3014b2f9 2dd61241e18c3494
2017-01-14 09fcf0d0746602a362d9d70bddd37b8831c74553c7f9e557b7c0d9e6f0eaf929 2bdd2090ff7d01a6
2017-01-13 8841d600f26879ecd6de669bc18a7a8ad878e377bb0fcac862f2c54656b78448 2e2dde71171cf10d
2017-01-12 bad13c4db104c19447606e965424ea1f17fbb27948423f2ae3412cb5226b313f 641ca9f72d9ea5a5
2017-01-11 8682abaa76ba8b59c2c65de65048bfcb0ba303ad0a55274179392167dcb298e8 544d824ae054fbee
2017-01-10 4f5f1b5914fd3a25d7d09d61e500b93a7975aa092cfd669b650aeb7afb9ad8e8 24309e0a5d7baaf7
2017-01-09 2b7c4c715a9c6e66e608c5bed6af470ff1f91552033325798527fb4af1599d3f fd55a1bd109a318d
2017-01-08 e1008c76c6c92fa0d9e9cb96ff541e0cb1892a69b179b3302afde6d5fed9c4fa 1b30b5fe0215b293
2017-01-07 6f58ea2300ed1ed685a9119af26188d651a58d7df22ce750924dd06bccc0643f d618efa111c9563e
2017-01-06 17290108cd20c1a9b206651344731af1e04c5f0462b852e6d83d6cb0e357389a 76dfcfd3d7c8a7fd
2017-01-05 8e5766494da8aa7c1457bea5578b8fc6bc480e5dbeda7a88894c2a49bb75eb00 3db2c87ff611884c
2017-01-04 420a27acab0abcfbf7a3e8d931f02abb20a678599b930de3b28e69c1e4e4b2e3 b51b7198321177b6
2017-01-03 3d724253e729153033f0980cb600e1eb92c133d30313cfc6005900ad0306b873 da17af123da2990d
2017-01-02 457471209be4a94bd6d2066431c670bfb96006c869c6e58057fc2da257729e30 efa470eb726e943d
2017-01-01 792d1e2f0c95ac2f6d68ac398a78428c4483bce5c38db2081b27f43e43e877fc ab0125bfdb691e58
2016-12-31 d73284b5220190244374c5241c20148ff4f6d8fc57c836f318363b2781d15a45 3ef848f16f3901a8
2016-12-30 6a94cf557130f70c8e749d13da4348308d1dfffaeba0e44650da4d3c11db10c9 06767503711961b0
2016-12-29 4afd3047adfad9119b765caecaa51a306dd2de991437bb06e94aab9323295e67 065cc7206abc8806
2016-12-28 973d743d0ef19b871b706ecdc6ccf7b246a15ece8202b8b453e9df614bd856ad 07014f7f9b9791e3
2016-12-27 653883062e6fc88bbba83d0050a9bfe4da394e6b60fd66d7b419ff32c11c7e36 c35d69d15b08a980
2016-12-26 69e79cbc98da322bdc47fbc0cdd4442c4239e4b7c6c1d1b037944c0727644c71 6a642e8a594b660c
2016-12-25 e2512be934654e85fe4530a90c724f591f64c747eb948534a02826ebb9f91ded e06f1fc0de3abbd3
2016-12-24 9b749dfe0e7bb7c025a9f2b6f89d0b6155d16f02e6bba0cdd4bbaa0e73fe1686 19b08d79975b5495
2016-12-23 34a1411c677691987f2058cfa1f611f0c43465436daf3e5acb4522e65544562a 8426063487486418
2016-12-22 f678ef7457fb216f38561acabf1cf985bc565f967cb97a5a9ef3d29801523bb7 c3acbc1af380522f
2016-12-21 01869b8ab97e6afc3d5c975a920351ca1c2407488f4efc3324584cc6b1a5eee3 39a2b91d8e6180bb
2016-12-20 1b102f7f7783d59108c2e5d2049fdc50a4b046d49ae93e7e93441233b521e205 aaa457ca9ceb2ac3
2016-12-19 c254c7c2008375927332611f4f1945568d00124a2659d5e737ad0c418b40552e a0a36beaefa6e4f7
2016-12-18 5187493bb1a454ce3ae11525e329db2b797da2efb5066992d7a3071ceaad0727 5aa35bfcb1816e54
2016-12-17 409e4072abf9b7251cde0d489282e5c83a7588dc2d0a353216ad18d837af3afd b24a4268fda73a42
2016-12-16 e801b6deb1376128ce96c750fc12864ac9284da2e23482fba97c9143d722dbd3 0722fdb6593aec91
2016-12-15 bd0bced89798baac64261d311f7c3844c720313f0db7257c742bf6171e032468 501764485b17ac8e
2016-12-14 b811ab0e5d8e9646fd8a53e33bb377f487d9b4c56be6821d9c606b667044d1f9 8db3c6269e7d5957
2016-12-13 56a589a73112c661a297dfbcb39b3fd4ce29185206a5a3821208ed05dbdb8afd 6d6b70b183d77c02
2016-12-12 d7a85bb8fb0e129c950ffefa66afcf528c8ef921f0bf4cb441ae39f0120cc4fc 92cd2909e3c0a17f
2016-12-11 4a876798b95b0eeebbb99b4f3743534d7b10dbfc1d0f9bbe08048add98cbdc8a edfe04b77cc9ad5f
2016-12-10 57dd66e85ddc250351e99ab79450fadab7f1f663ff4368b3dfa04589360127a9 b2353337b4ab1ba1
2016-12-09 b41eb5040966995a9a1532295859f260971897402dd7646278b2292f7e3c3f7b d15a2ba0e59945a6
2016-12-08 b35f914788763b2bed318f87f867a46be7166f928936e6ee06c1d18d5a1adddd 911acb417a04b939
2016-12-07 d5d7fb3e622589a1bc791c775d999ac693f31f71e33e730419ea954599221746 4f39fece5c8522a0
2016-12-06 fdb5295986ad6de0f15e3adec3aa0fca09b80c5254ba55a19e6f824c7dae3753 c35db0585e9d7159
2016-12-05 16d64d9741d9f44c9d4da07397fca42e72478e6d555548a6610d433efe9c08a7 3509a7b3993d9891
2016-12-04 024bfafe1dfa513f85bf7b8ee430c941e1542a7253c24714ad560df0f96eebb8 cd70e4642667c419
2016-12-03 0b38a9e1e411a6d849f55adf331988d1e7d5195c5ee4c07fadcda5356118bdde 805fdce206fe055a
2016-12-02 6fe67ed51c1f3efdcbe4c6dffc8cc5dd26976be36573d0754e4bf5cb1a7c38b1 b195bb7e58e73e81
2016-12-01 4624cac8577df4eb4f72e427d0059e74531e9e8700893bf4e6805a85fae399c0 904f6786a2a226f8
2016-11-30 58f7aa6011db82d7d6f06e3ccf5fb89b04640d6f24ef2df650eaa24b64d8cbad a8580c60f5579e39
2016-11-29 cd2c9a185ace42d1f081480dc5664c5a1dba9f06ba931f61bc3384483fdbda99 f20ecf52e15223d1