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How can I ensure that the Bitcoin on the note isn't corrupted in some way such that it might not be accepted by certain exchanges - Bitcoin that has been through a tumbler for example. Will your mobile apps by able to perform those kinds of checks for me, or will that require me to take extra steps?

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We have no checks in place like this today, but that's an interesting suggestion. Sounds like some sort of OFAC address checker?

I wonder if anyone's built an API that handles this kind of thing yet - seems like the sort of thing a company similar to Infura would offer.

Found one: https://docs.sanctions.trmlabs.com/#section/Introduction

so you want bitcoin as non-fungible cash?

isn't that a counter to the whole point of a cash-currency?

Yeah, I do find the fact that Bitcoins are not in fact fungible darkly amusing.

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