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
2018-12-16 269ae9c62ad8a7d8
2018-12-15 8e5c68965e1c2c2c1a9ce5d3992d6a2c2f2e72f7566fc31d8e52cc3e771fb965 2c43685909129035
2018-12-14 56cb52d6e15b195bb3d47a702251602f89be3b8f0e13b1f4c3e6ff40b8099941 73a3af4844deacd3
2018-12-13 1cedc8ef470911fd272ec23cd4b691239a562408430e72115a0cd823e9035207 1f906a0dec21af41
2018-12-12 ff8d877f884857928de803f968b46646641d642feda649c3241f1936da74c60f 46b2dfe1c3ad6074
2018-12-11 346285c2cfd56fa7b43e48f1915fd8e98a619559b5c1b6dfc87dbaa55323a716 1c312ee6ea06dd81
2018-12-10 46d5baa249b13fbb7afe2bfcddb574e645db3c6c0abde012cd8b7770e02bf26a a81b8d7ce5f03ad4
2018-12-09 7623eb5f0763cbee1e8db365528732bc12aea8d31d227900beb6005b1cf8a75f d55c80fc0a99514f
2018-12-08 94421a865858e415cfbec11b7dcffb2e6817e17876773492b5f05ab9772079cc e56faad630439bff
2018-12-07 79c6231103ad38b1ee3c327e382afabbd4b547c2aa9cb80514cd9f795bd2068d 23adacfda2e78e77
2018-12-06 f7d6718470f4ec40689caa9b9c9a2e2952604abe4d741401e0a497f3134df931 7a654a198033c40c
2018-12-05 11a7dca93390ece6328974aad95a6bf8a60157f23a7215b3fc8c1f32ad704175 2fe436de35176d66
2018-12-04 5ecf28d24ab6694f7bcaec174317d21bc87d1068f7342a3ac5bb43457e2f057d 62974ec2b4a2ddce
2018-12-03 e0f2d81c1bb1b76cdb8d8a86c97cfe067272c48f1df11d4402d7f8f75efb3d7a 69caa90978f51ba1
2018-12-02 721751ee31f48f311c3e9a565c6ecf1e4416472e1371ff253600e93d362df715 ce2aa9f834bffde0
2018-12-01 832825bc9de78e0b534a347aa2793506c6ce4cbe128f136a3450c116dc723e3a bc30e2fddcea4fb2
2018-11-30 fad7674d8f0fe9744b209c36c815faee665c0814e9ea6faf3a9f241f8e684563 714e405018236fcc
2018-11-29 0d94af279960d60555f11b283955d5d7edb7c920d15d99931860c038c7791647 4f6a18ce8c069ad7
2018-11-28 cf5b2f88df7079ab883a6bf4379e7c7fc7054090b99ba988dc66f0193ee56cf4 aaa54530fa68b4cb
2018-11-27 768eaad3b7d432ce3d31e0ef7f583dc662abf05825b9bb2271ce563f524162cb 6da3ca473c0f2b98
2018-11-26 e27eedf777571b4b7c37a23de2834e0cdee96ad8c18abc333e78dee8d167b187 ed8ab125ec6a3df8
2018-11-25 ddd357b67f23be1447cdd82f73c3cbd7d86243caf9960608bdaff6d2487e59ab 797dca9373f178e0
2018-11-24 0b30c99776481fb2a4a5cf7cbd50064116cba84dfc334fc62c0dbfb3f07a9dff 0da45bdd1c6c0fdc
2018-11-23 880e306d78d97151c5c35894b24a991b691b4599c95120ab2f96585f30477b8b a91185490ca3e952
2018-11-22 5f748afce51cb36779bd4a4e6f72fdac97c1a248c540e82dc15318263e96eb7d 464fcc65a3cb2253
2018-11-21 487f6648ac1421abf55fb1fe2524cfbcea7eac2ad7074e6c45f553fefb87a070 85cba09efff92a05
2018-11-20 fd618a19eb850dfec7f15e39854ff79256e721f34e38bd43e416602c8460be0a a29c18a91eedd371
2018-11-19 23e323e32057d043cfad205be961247b30091945438bbb7e350808e8c58c21e6 5e5d815259d67389
2018-11-18 f98c89a226433416bca98ef1c01aec3a0b674af5ff7e0452654cfa090701898a d72e3bfb8a8260ae
2018-11-17 12f9f3f7dd692183c080b8b146c68b573fd4e380588f9409530877b959ca4de2 9f1d1242adaed39c
2018-11-16 f9639ff841d9ce6acb2c611e9487ba12c2362bb4b6eeecc754a64562629b32c3 52d4af64671fb23f
2018-11-15 7cff9c3192086c86c5da23c1af32275b31402ba4a51ca9b463f336ae63d46a9c 00d1e33a81d21202
2018-11-14 a7afb67af6fd243f5a19f0b15ed3c9016262484c06a44ca8b865372da56595f8 4233cdf337963076
2018-11-13 c7e8a6a96c843b8596b8b56c9c1f271e44db726b154905cd317c83b7f17b5f8b c5caa3a35b3f6401
2018-11-12 2c80fc61fe244b1e69de14f7de7f757a2fb485b22fd6d8c90bcb45537e4cfdd3 9314520e749795e1
2018-11-11 fb6593c671ec61afae3ebb5341d61061d75f71fdaddd4f26c15351c4a7560baa dd7dbb738cdde779
2018-11-10 620fb098dcf3deb2605cfc6dc003b856911edd6a5965e3a840a16a3c75473854 3ee0598e8f797731
2018-11-09 9254ea2c3f282fd1b944be911f3b3044d20a044efa47ee5678a041d968a03254 d519c1b8e8cd0122
2018-11-08 4b9c5f753eaddb12f4a7a6f59a4053aa6cd0ee0c8a54f129da10f1c6e24a4cc0 98afdf9c4819f7e3
2018-11-07 744bc6e179c7b7eb6a70f14bd63ed92909d447adb8cb2f6bba50bf8725b2e6c0 06c4bc6c075bc234
2018-11-06 3406621b84cab8a529be1509c734177d2fe525dd6e769ddead7f974ad9f56af4 6a7d2e9b50ecdd97
2018-11-05 cee0be28b96af9aba59ac1a6c10ffceaa623011e09dc01212398257acdab9959 0159f20e7f584020
2018-11-04 c56729cdb821190a220d3622c0c01fe85a2255ba4909a211dac22ac3f00ee9e6 498cf59bf4455066
2018-11-03 68d0b305da82634e292150a8c50af43e9c70b9970b45ef6e7b83b78a415a4e69 a854b7a86888c09d
2018-11-02 86d92d0946832963133384afccd59acb34373c717107c790f95e6a5369885d69 c9a548af4a6a0326
2018-11-01 84d0b9a184f0c41cf8e94a323cba3a38cab2e7e013a89a74f5e91da82de791f7 358ad9efb4dfec5a
2018-10-31 cd71dcefc414d5a715910e811157f76a362a35ea94c281cddf94d11bd283e03b 6926ea225b277024
2018-10-30 eab934b337a4817e4e366bacf3e233e90e47d02f7f337b2b5c6bc177a1056095 121ad7c07e28bb1a
2018-10-29 46f1d47a9ffebab448be94348fc099ccf602046f9ac4b481fab2d584e1d55c2e f0b9f1cfa255e806
2018-10-28 dce58e5dfac46ece79c8198ed5266c2fbaf03dddda05f474dc6e3b9ade52f641 ea76bc47a92f48c5