PLINKO PROVABLY FAIR VERIFIER
A Plinko drop is nothing but a string of coin flips — eight to sixteen of them, one per peg row, all pre-decided by your seed pair. This tool decodes that string, replays the left/right sequence, and names the bucket the ball was always going to reach.
Each peg-row decision is one float out of HMAC-SHA256(server seed, "clientSeed:nonce:cursor"), floored to 0 (left) or 1 (right). The port matches Stake and Shuffle output exactly; anywhere else, check your operator in the compatibility table.
Row-By-Row Trace
Watch a Plinko ball ricochet down the pyramid and it looks like physics. It is not: on a provably-fair casino the “physics” is a scripted playback of decisions already made by cryptography when your bet registered. That is good news for auditability — a path is just data, and data can be recomputed. Punch in your seeds and this page prints the very same L/R sequence the animation acted out.
HOW PLINKO PATHS ARE CALCULATED
Plinko consumes one float per row to decide each bounce:
- Generate one float per row from the HMAC stream.
- For each row,
floor(float × 2)→ 0 = Left, 1 = Right. - The landing bucket = the number of Rights (0 = far-left bucket).
Reference drop: seeds some server seed / some client seed at nonce 1 on eight rows bounce R R L L R R R L — five rights, so bucket 5. Row count changes how many floats are read, and risk level changes the prize ladder, but neither changes the arithmetic the verifier replays.
THE BINOMIAL TRUTH ABOUT BUCKETS
Plinko’s payout board is a probability lesson in disguise. Eight fair coin flips generate 28 = 256 equally likely paths, but the paths funnel unevenly into nine buckets: only 1 path in 256 (≈0.4%) reaches each far edge, while 70 of 256 (≈27%) end dead centre — the counts run 1, 8, 28, 56, 70, 56, 28, 8, 1. That is why the monster multipliers live at the rim and the centre pays pennies: the casino prices each bucket against its binomial frequency, shaved by the house margin. When this tool confirms your path was fair, those published frequencies are exactly what you were playing against — no more, no less.
WHAT A PATH CHECK BUYS YOU
Suspicion in Plinko usually sounds like “the ball swerved off the 1000x bucket at the last peg.” The animation genuinely can look that way — but the final peg never decided anything. All eight (or sixteen) bounces were fixed together, before the ball was drawn, by seeds the operator had already committed to. Recomputing the sequence proves the swerve was scripted from the start rather than steered in flight. Pair the check with the Plinko odds calculator to see whether a bucket’s payout is priced fairly against its true frequency, and read our rigging investigation for the wider evidence.
Related Resources
Play Plinko: Stake Plinko
Strategy: Is Plinko Rigged?
Calculate the odds: Plinko Calculator · Keno Calculator · Roulette Calculator
Drop sites that pass the seed test: verified fair casinos