000000000fdf0c619cd8e0d512c7e2c0da5a5808e60f12f1e0d01522d2986a51
The nonexistent cat is memorialized on the Bitcoin blockchain forever.

Free images of Lauda!

Quote from: garlonicon on July 03, 2022, 10:23:34 PM

Quote from: nullius on July 03, 2022, 09:29:17 PM

Would you please point me to the txids?

Quote from: garlonicon on July 03, 2022, 08:49:12 PM

with nine leading zero bits

Sorry, ~~bytes~~ nibbles (4-bits) of course. There are more transactions, but you can start with them:
https://mempool.space/testnet/tx/0000000009e6f27e34e9d5e17df63758375195eb76b46daf0327b4aba151bfb4
https://mempool.space/testnet/tx/0000000005771270ab7be0d9dc5358048aad0e003c6482819438fd9a61b80841

Cool. Thanks. I’d much appreciate more.

Quote from: garlonicon on July 03, 2022, 10:23:34 PM

In my opinion it is just a nice trick, but I could be wrong. [...]

Quote from: nullius on July 03, 2022, 09:29:17 PM

Someday, this “mining” of txids may make for an interesting thread in the development forum.

When it comes to transaction mining, it is just a nice trick, but nothing else is behind that.

When I indicate that I have some practical usage in mind, I probably do. Beyond a neat trick. But I may want to keep it a trade secret. Note that what I was doing was probably more complicated than you guessed.

112f4a306f8bbe39270b0f1070751038fcf01f4a5eca42277a83e7ab3791afd5

Quote from: garlonicon on July 03, 2022, 10:23:34 PM

Quote from: nullius on July 03, 2022, 09:29:17 PM

Was that the first time anyone had ever done this?

Of course not. See this testnet3 transaction: https://mempool.space/testnet/tx/16fb1c624b3658c78630c39f1c33e8f3dbdb71373f33eb22c6abe4405c0815bc
You can try to grab some zero satoshi test coins by re-mining satoshi's blocks. And there are more such transactions.

That txid obviously is not so; and at a glance, I don’t see any related txids with too many leading zeroes to be coincidental.

I meant: Was 000000000fdf0c619cd8e0d512c7e2c0da5a5808e60f12f1e0d01522d2986a51 the first time that anyone had ever mined a POW txid with many leading zeroes, or any other easily recognizable pattern? Especially on Bitcoin mainnet!

If my Kitty tx for Lauda was the first, I would purr. (Also, if it was the first to embed a cat emoji in OP_RETURN.) I was not even much thinking that way last year—just trying to make something fun in Lauda’s memory, like the sporting games that the Greeks played at the funerals for heroes in classical antiquity. 😺