I may have to resend. Will check in a bit
nostr:npub1tta8zx3wfazjjnyu4qpnscdqu9dg08n0cxj2dypkgrml46hq67uqmufeqx was the closest guess with 5 digits of Tau. I truncated and they rounded up.
$ echo "The answer is 6.28318" | sha256sum
20ca5f13a0306accccf25f7b776971b7ba7d5ce1f83492aca821d0b796a95ce9
I may have to resend. Will check in a bit
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