Provably Fair
Every game commits first, then rolls with entropy from the Solana chain. Here is exactly what that does and does not protect you from.
How a round actually runs
- Commit. When a lottery round, duel lobby or case battle is created, the server generates a secret
serverSeedand publisheskeccak256(serverSeed)straight away, next to the publicclientSeed. For duels and battles this happens before an opponent even exists, so nobody can pick a seed that targets a known player list. Lottery rounds commit before a single ticket goes on sale. - Close. Entries lock: lottery buys and sells stop at the closing tick, a duel needs both stakes in, a battle needs both players matched. Case battles also freeze a copy of the case's drop table at match, so later case edits cannot touch a battle already running.
- Entropy. Only after the inputs are locked does the settlement worker fetch one Solana blockhash and persist it together with its slot. Battles fetch theirs at match because the live per-round reveal starts there. The fetch only accepts a slot strictly newer than the chain tip recorded at commitment, so a game created and matched inside a single slot waits for the chain to move. A blockhash from after the commitment cannot be known at commitment time, which is what breaks seed grinding: the operator can try seeds all it wants, the final input has not happened yet.
- Derive and reveal. The outcome is one hash over
serverSeed,clientSeed, the chain blockhash and the game id. At settlement everything is revealed: the seed, its published hash, the blockhash and its slot. You can re-run the math yourself in the verifier below and check the blockhash on any Solana explorer against the published slot.
What we can still do, stated plainly
- The worker that fetches the blockhash is ours. It keeps trying until a value lands in a slot newer than the commitment, and exactly one fetched value is written with the settlement claim, so it cannot be quietly swapped afterwards. Attempts that fail or land too early simply retry, and a compromised or dishonest server could still time or retry that fetch. That is a single point of infrastructure trust, and no purely server-run scheme removes it.
- Your account, your balance and the payouts live in our database. If the whole stack is compromised, fairness math will not save you. What this design removes is protocol-level steering: grinding seeds, re-rolling after seeing entries, or adding tickets once the draw entropy is known.
- Rounds settled before this upgrade (visible in the reveal: no chain blockhash) used only the two seeds, and are still verifiable with the legacy formula.
Formulas
Winner-take-all lottery draws:
target(tier, attempt) = uint256(keccak256(serverSeed || clientSeed || [chainBlockhash] || drawId || tier || attempt)) mod totalTickets; winner(tier) = first entrant whose cumulative ticket count exceeds target; the single tier-1 winner takes the whole pot (legacy rounds paid up to 4 tiers; collisions with an earlier tier re-derive with attempt+1). Rounds settled after the chain-entropy upgrade include the 32 raw bytes of the revealed Solana blockhash (base58-decoded) between clientSeed and drawId; legacy rounds verified without it leave that segment out
Duel coin flip:
winnerSide = uint256(keccak256(serverSeed || clientSeed || [chainBlockhash] || lobbyId || 0x01 || 0x00)) mod 2; side 0 = lobby creator, side 1 = opponent (join order); rake = floor(pot * 0.5%). Duels settled after the chain-entropy upgrade include the 32 raw bytes of the revealed Solana blockhash (base58-decoded) between clientSeed and lobbyId; legacy duels verified without it leave that segment out
Case battle drops:
value(round, slot) = uint256(keccak256(serverSeed || clientSeed || [chainBlockhash] || battleId || round || slot)) mod 10000; drop = case dropItem whose cumulative weight range contains value; slot 0 = creator, slot 1 = joiner; winner = higher cumulative drop total; exact tie splits the pot after rake; winner takes the pot minus 5% rake, not the opened items. Battles settled after the chain-entropy upgrade include the 32 raw bytes of the revealed Solana blockhash (base58-decoded) between clientSeed and battleId, and derive against the drop table frozen on the battle at match; legacy battles verified without it leave that segment out and use the case's current drop table
Seed commitments
serverSeedHash (commitment): 0x34a5a2b600f745d76b43f590803e54f64e436f0d2dcb6dc1a55539dfb3ace0e2
clientSeed: 0x9e402179a99131f8ee2670d9c7b2e4c1c1dc008c3bd3b76c21139f1fe5797048
chain entropy: not yet, arrives with the draw
serverSeedHash (commitment): 0x2a8dea3bf27b504b296c694c5bce19161ce5e0dbcc1229d5d7f6e7ba75c23c5d
clientSeed: 0xc3ab5499b34feb62c645b0d5847fb03388f8e5b37f5469ede37f3344334fb591
chain entropy: not yet, arrives with the draw
serverSeedHash (commitment): 0xd449f4dc8f4994cc7c58d5ee3451cc40a65f0076a822926c1139ddd40bea0bb3
clientSeed: 0x784fc8db8aa524dc91467d096b5b9c554b245854bd8a025f940d258928a9b57f
chain entropy: not yet, arrives with the draw
serverSeedHash (commitment): 0x1de14308e3055e32d9036594b402fa7d4b23e064f19f926e2e66b8e23301aa1a
clientSeed: 0x19af35baedda7731037af3be6faf601530cecb36afc236f3791b09e792b82184
chain entropy: not yet, arrives with the draw
serverSeedHash: 0xccb007ec57c4f2a06c7b831327e6ed03b2b15648ab054aded337593dba781bbc
clientSeed: 0xac2962cb0809da5cc9883c86d09a89d3fd056c9c2f06ef0a7958cd3b91a37a88
serverSeed (revealed): 0xe2aac906f3942d63831c7d73d2017055c1b16b44dba16b49e1769dd25829cbd7
chainBlockhash (revealed): 141GKpBKNcaVSKqNgxJYHS2ufTR4XkgLyPxHYHAFE6hM
chainSlot: 458507294
serverSeedHash: 0x75219daa8dc0281e18f5ab95c26335fc3179955d0f2682a0dd10ca6b380f3c2e
clientSeed: 0xa18d4ae33cbf3207791c04413c76843c27586d1f22cc20d62c9a50efc1d28e5b
serverSeed (revealed): 0x8fed5f7f9d8826495012e97a777630b539c965a5a4bf4c1ae80ea04b2187a2d4
chainBlockhash (revealed): Bg5Kf7dWoexzGn2vyMyJrCGKQkumJXuQ6CLL1d2Dm1MQ
chainSlot: 458505902
serverSeedHash: 0x1b2d5080f20f643963b531bc744ba3a66164be5b21d410fe7a3482733828af4a
clientSeed: 0x23c8525caa3337230b7b15fc2d772bc45fa56c58f766f8b0b99715c7de0abc71
serverSeed (revealed): 0xab78d031a9a33ba4b8dad3af97d4ec57164636fac952661d96ec0ef468da8fb0
chainBlockhash (revealed): GxuVXRkX4BYbC84YbuG6HRxQ7WHpnjSH5rngyV3BwSkn
chainSlot: 458504504
serverSeedHash: 0x53c6c7d452ddd29772bfd7c791f671a4c5619367665f6221daebdf49f6db0ad6
clientSeed: 0xb8f6843517892e6bc6e0a7ae63e6e79dec20a5075fdaf717905e81b4f33fe5e5
serverSeed (revealed): 0x51be38e09ab1124d0bef244517d3c2967b4766b7c323f5be08af38d0caa18e4d
chainBlockhash (revealed): 81h3nL8o46f1mL2rFg2tgFtNJnNbfgQFZgvDb8pz4shn
chainSlot: 458503106
serverSeedHash: 0xfa646cf801dab38af9f5fa615f5de986db7527a1268621eb1bf7ba7b1c9c65b0
clientSeed: 0x3b73c5f603e78c806036e6e74fc7e18dabdf677bc4f6b6578293783c9b216649
serverSeed (revealed): 0xf86464819f2f8c66d1031f36518d13793d138dfe332113c7b30e1670e2266a23
chainBlockhash (revealed): BCCGeJNi3Fb1gdfmuv7br6iFoLhJBSoGJkze9MoudmAw
chainSlot: 458501719
serverSeedHash: 0x27ed30e07bdfbf409f773768ec3e0bf563d8a4ccaba3c7c3ba9bcd08cbf6d3ca
clientSeed: 0x4fcc0aa352fdd7f22c047547d75afaab101d13badfa3aff779033f4debc5e58e
serverSeed (revealed): 0x5299b5cff4f829ef3eaaa91b1d1c794f9272470c59aa899a132c79781320eedf
chainBlockhash (revealed): AQQ9NE3A45QVq79HWFrYoZJ6PYzMZ77t3NUmzKt39sJY
chainSlot: 458500330
serverSeedHash: 0xd45d9fe4b3316b51884026be98557aa551f512fff91205c74e6c5c270a57f3c5
clientSeed: 0xf432fc0f7e3f8f6750b999e1bdf119bac8ec32ddcb444833f03060487a335ec5
serverSeed (revealed): 0xd9501d9c771aecbeaeff5b28cf7e5ea8b267eede792d94010a36ea82aecb4aab
chainBlockhash (revealed): HRNYkkopRwa2AexSm5Z6QykFA5ndq2MLo91uMrdiEe1W
chainSlot: 458498948
serverSeedHash: 0x3b34b0ca3e899e50fd9b96a167813ec9eb218322602d596bb8327ecc2d394e0a
clientSeed: 0x867dfc770cd7c23b06c6ad3e8ba71f030f0f55930c2912e80e859d4ca86e8360
serverSeed (revealed): 0x7013a8931ed69cfd5025a40006440216480ed13f4246bcf5e8b0a27d2eb015c9
chainBlockhash (revealed): EoJ3cyxh15BNASmq8sA8PU956SrYeua5Y5zjYeJ5eqtc
chainSlot: 458497570
serverSeedHash: 0xa8a20fcc309dab85002ed9934de4eb5751266954243d35081a177051b143e1c8
clientSeed: 0x4ca3cd9fec2ee0b07b2a7f53a2444d42939806c4d82b8956cfa0f1c9c1778659
serverSeed (revealed): 0x35e12f19ef61d72f6bcd83389bdf2652d6214cae86c28facaf5b3c909deeea70
chainBlockhash (revealed): 619JfmmwjxwKDuj4JXrWB3F8jGo3YsLYRH9QeFfwymGV
chainSlot: 458496176
serverSeedHash: 0xb5cf942928be46e8e1bedbe56198170fe503b72deef8632cf6632a0764edbda7
clientSeed: 0x3be9f9722567503dd56cea0658fe734b8b01f3370d5da4431971abf640e456c2
serverSeed (revealed): 0xe4e9025bba9633ca1a527b358d15cc14191c2fd2ab78acd8708ecc8e8ad8d3aa
chainBlockhash (revealed): HBNbx8X12aCkNZRAVsXJyVcNM1HaUZBYYiJGnW7eqpKc
chainSlot: 458494792
serverSeedHash: 0x0dc2a71b467d764d794c52fa239e7b907ba4efdac966ae03c3af196e0c33eeeb
clientSeed: 0xadba1b32a1ecf4a3b7be105f38ee16071f618f0e833071ae749172dbd2b742b8
serverSeed (revealed): 0x2e2c80556e9a69e6f82f5a98d039586d69fc028c2c70fadb6f42b9b29dcaedbc
chainBlockhash (revealed): 5YeirKkAnowUa2dmnjerraVhWTV9FrXjvCQLsqAsYN1j
chainSlot: 458493408
serverSeedHash: 0x950e3d0dbb6b3dff783f3917056e2932fc5c21ea8777b360b011bb031f47e473
clientSeed: 0x2089f2aad607c8db3c166f15091cd24ef230e6815307bc2aa8795ffa91a49f5f
serverSeed (revealed): 0x29a15f862b5014103d09da255eea89c42870666527e2a6f4e621f84603317863
chainBlockhash (revealed): BefyAM9wR6Bc3rSDtk3jUiCMEdeqYR6iB44z6HzH2GoX
chainSlot: 458493406