I assume that once Bitcoin became collateral, it quietly stopped being my Bitcoin.

Maybe it was sitting on someone else’s balance sheet. Maybe it had already been lent out again while I was simply looking at a number on a screen. I never questioned that part because it felt like the normal price of using Bitcoin in DeFi.

Reading through Babylon’s Trustless Bitcoin Vault design made me pause.

The protocol does not just keep BTC on Bitcoin. It also prevents that collateral from being quietly repurposed. Each vault remains a single Bitcoin output with spending paths committed at creation. There is no protocol route that allows someone to lend it out again, move it into another product, or reuse it elsewhere while it is backing a loan.

That changed how I think about collateral.

I had been measuring safety by asking who was holding the coins. Babylon pushed me toward a different question: What is the protocol actually capable of doing, even if someone wants more flexibility?

Those are not the same question.

I think this difference will matter more as Bitcoin-backed lending grows. The biggest risk may not always be obvious theft. It may be invisible reuse that users never realize is happening.

Sometimes the strongest security feature is simply removing the ability to make a tempting decision.
Would you trust BTC collateral more if it could never be reused.


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