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June 30, 2026, 06:48:46 AM |
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Hello all, I spent a good chunk of last weekend going through what was presented as a proper compounding tool for BTC positions. Looked solid on the surface, clean interface, sliders for frequency, starting capital, monthly additions. The kind of thing you want to trust. Except the numbers didn't add up when I cross-checked manually. The issue was buried in the frequency assumption. The tool was calculating daily compounding on a nominal APY, but the platform it was supposedly designed for actually compounds weekly. That gap, over 18 months with a decent starting position, was enough to throw the projected outcome off by something like 8 to 12 percent. Not catastrophic, but not negligible either if you're making allocation decisions based on those projections.
What gets me is that this kind of error is incredibly easy to introduce and almost impossible to spot if you're not already suspicious. Most people who land on a compounding tool are looking for confirmation, not verification. They plug in their numbers, see a satisfying curve going up and to the right, and leave reassured. The tool does its job psychologically even when the math is off.
I've started treating these calculators the way I treat any on-chain claim: verify before you trust. Reproducing the output in a spreadsheet with explicit formulas takes maybe 20 minutes and tells you immediately whether the tool is consistent. If it isn't, walk away.
Curious whether others have run into this, specifically on tools that don't document their underlying formulas anywhere. Is there one you've actually audited, or at least one where the source is public and readable?
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