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A comment on Walmart filed patent for “Digital Currency via Blockchain”. Parent comment

Re:Walmart filed patent for “Digital Currency via Blockchain” by jeromegv on Saturday August 03, 2019 @12:32PM (#20601231)
Why is it so hard to audit those bitcoin exchanges then?
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Re:Walmart filed patent for “Digital Currency via Blockchain” by ISL on Saturday August 03, 2019 @02:16PM (#20601800)
A public blockchain is straightforward to audit. It is the documentation internal to an exchange which can be opaque.

If trading is done off-chain, or transactions are made between currencies, those are not a part of the blockchain. For bitcoin-only transactions between wallets, no exchange is required.

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