No. Not from a casino supplier, at least. That trade is six-sided, because craps and sic bo are played with cubes. A real casino die measures 19mm, its edges are machined instead of tumbled, the pips are drilled to matching depth and filled flush, and the body is transparent enough that a void inside shows before the first throw. Each set also carries matched serial numbers. Every one of those features answers a question about tampering. Nothing in that list makes a throw more random.
Precision d10s do exist, but they come from the RPG side, where the word means the edges were cut rather than tumbled. Treat the grade as marketing. Sellers claim .05 mm on their AAA line, an ordinary die runs .3 mm of tolerance. Even a real bias barely moves the needle: one face coming up one percent too often costs 0.03 bits. Getting to 128 bits with a d10 costs 39 throws.
The cleaner path is a face count that is a power of two. Pick a d16 and every roll pays exactly four bits. Take 32 rolls and the phrase has its 128 bits, double that for 256. Rolling a d8 pays three bits, rolling a d4 pays two. Ten sides give 3.322, so the digits have to be converted out of base ten, and that conversion is where the mistakes live. Rolling a d6 gives 2.585. Fifty rolls of it make the 128 bits.
Now the part you asked me to tear apart. My line about coins beating typing defended the wrong half of the problem. Nobody has ever lost a seed to a badly balanced die, the hand is the weak instrument here. Writing down 128 coin flips means 128 symbols. It fits in 50 d6 rolls or 39 d10 rolls. Fewer strokes, same entropy. Checksums also catch less than people assume. Twelve words carry four check bits. That means one transcription error in sixteen survives, and it yields a phrase that is valid, complete and not yours. Twenty-four words leave one in 256.
Print the sheet before throwing, write left to right, pick the die whose faces need no thinking. Once it stops rolling, the die stops mattering.
Roger
npub1dq…e95y4
2026-10-16 11:24:05 UTC
in reply to nevent1q…r8pe
Author Public Key
npub1dqjq6jfjj5py9yjyxnzmzxqrt2fyfz54wr90rl084m980tausrjq9e95y4Published at
2026-10-16 11:24:05 UTCEvent JSON
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"content": "No. Not from a casino supplier, at least. That trade is six-sided, because craps and sic bo are played with cubes. A real casino die measures 19mm, its edges are machined instead of tumbled, the pips are drilled to matching depth and filled flush, and the body is transparent enough that a void inside shows before the first throw. Each set also carries matched serial numbers. Every one of those features answers a question about tampering. Nothing in that list makes a throw more random.\n\nPrecision d10s do exist, but they come from the RPG side, where the word means the edges were cut rather than tumbled. Treat the grade as marketing. Sellers claim .05 mm on their AAA line, an ordinary die runs .3 mm of tolerance. Even a real bias barely moves the needle: one face coming up one percent too often costs 0.03 bits. Getting to 128 bits with a d10 costs 39 throws.\n\nThe cleaner path is a face count that is a power of two. Pick a d16 and every roll pays exactly four bits. Take 32 rolls and the phrase has its 128 bits, double that for 256. Rolling a d8 pays three bits, rolling a d4 pays two. Ten sides give 3.322, so the digits have to be converted out of base ten, and that conversion is where the mistakes live. Rolling a d6 gives 2.585. Fifty rolls of it make the 128 bits.\n\nNow the part you asked me to tear apart. My line about coins beating typing defended the wrong half of the problem. Nobody has ever lost a seed to a badly balanced die, the hand is the weak instrument here. Writing down 128 coin flips means 128 symbols. It fits in 50 d6 rolls or 39 d10 rolls. Fewer strokes, same entropy. Checksums also catch less than people assume. Twelve words carry four check bits. That means one transcription error in sixteen survives, and it yields a phrase that is valid, complete and not yours. Twenty-four words leave one in 256.\n\nPrint the sheet before throwing, write left to right, pick the die whose faces need no thinking. Once it stops rolling, the die stops mattering.",
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