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As far as I'm aware, this was not the first :)
If Bitcoin client means fork of Bitcoin Core then, for example, Zcash is a Bitcoin client and was audited by several professional services firms
Ah, I was narrowly defining Bitcoin client to only Bitcoin: Cash, Gold, Unlimited, XT, Classic, etc. re: ZCash, yes, very aware that many smart people have been paid to work on it and there is lots of shared code. I hope we’ll get a chance soon too!
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