| ID | Start (+offset) | Direction | Blocks Used | Status | Roll | P/L | Verify |
|---|
| # | Block | Transaction Hash |
|---|---|---|
| 1 | — | — |
| 2 | — | — |
| 3 | — | — |
| 4 | — | — |
| 5 | — | — |
Enter Amount, choose Direction (Under/Over), set Target, and enter a Client Seed (required).
Click Place Bet. You’ll see the start block and your offset; the game auto-settles when the chain reaches the required confirmations.
When settled, click Verify to auto-paste the used hashes into the manual verifier and recompute the roll yourself.
Parameters:BASE_DELAY=20, OFFSET_SPAN=7, N_BLOCKS=5, MAX_LOOKAHEAD=20, CONFIRMATIONS=12, QUORUM=3.
Commit (at bet time)
baseBlock = current chain height
startBlock = next unique block ≥ baseBlock + BASE_DELAY
offset = SHA-256(clientSeed | betId | baseBlock) % OFFSET_SPAN
Window = blocks [startBlock + offset, ..., startBlock + offset + MAX_LOOKAHEAD]
Collect hashes (after window mined)
Scan the window; skip empty blocks.
For each non-empty block, take the last transaction hash (not the block hash).
Stop after N_BLOCKS = 5 hashes are collected.
For each block, require QUORUM = 3 independent RPCs to agree on the block data.
Wait CONFIRMATIONS = 12 blocks after the last used block.
Roll
Let h1..h5 be the 5 tx hashes (hex without 0x).
digest = SHA-256(h1 || h2 || h3 || h4 || h5) (hex as big-int).
roll = (digest % 10000) / 100 → 0–99.99.
Win/Loss
Under: win if roll < target.
Over: win if roll ≥ target.
Payout multiplier shown = (1 / winChance) × (1 − 0.01) (1% house edge).
No server seed: randomness comes from future on-chain tx hashes you and the house can’t know at bet time.
Client-seeded offset: your client seed deterministically shifts the start of the window; you can recompute it.
Multiple blocks: using 5 independent blocks prevents single-block manipulation.
Last-tx only: prevents cherry-picking within a block.
Empty-block skip: avoids weaker block-hash fallback.
Confirmations + quorum: 12 confs and 3 RPCs reduce reorg/RPC bias.
Unique start per pending bet and single active bet: avoids result correlation and race conditions.
After settlement, click Verify on the bet row — it fills the Manual Verifier with the 5 tx hashes.
Press Compute Roll. The displayed roll must match your bet’s roll.
Optionally, open each tx on BscScan (paste any hash) to confirm block numbers match the Blocks Used shown.
Recreate: compute offset from your noted Client Seed, Bet ID, and baseBlock; confirm the derived window covers the Blocks Used.
The Client Seed you entered.
The displayed start block, offset, and blocks used.
The 5 tx hashes.
The recomputed roll from the hashes.