Here is rijndaels answer in a comment on the post:
“ The hex value that used to be OP_CAT is defined to be an OP_SUCCESS in taproot, meaning that if its in a script, the script is valid. But, since it used to be OP_CAT, software like the mempool-space parser parses it as OP_CAT. BIP-420 picks that value to be OP_CAT, so if CAT were active today, this would be a valid tramsaction. To un-upgraded nodes (like… almost all of them), it is still a valid transaction because it doesnt see CAT, it sees SUCCESS. This is how we can add CAT as a softfork. Upgraded nodes will see 0x7e and interpret it as CAT. Unupgraded nodes will see it as SUCCESS. ”
How did they use op_cat when bitcoin core nodes don’t know how to deal with that op code on the stack?
Here is rijndaels answer in a comment on the post:
“ The hex value that used to be OP_CAT is defined to be an OP_SUCCESS in taproot, meaning that if its in a script, the script is valid. But, since it used to be OP_CAT, software like the mempool-space parser parses it as OP_CAT. BIP-420 picks that value to be OP_CAT, so if CAT were active today, this would be a valid tramsaction. To un-upgraded nodes (like… almost all of them), it is still a valid transaction because it doesnt see CAT, it sees SUCCESS. This is how we can add CAT as a softfork. Upgraded nodes will see 0x7e and interpret it as CAT. Unupgraded nodes will see it as SUCCESS. ”
Yay!
Likely a backend deal with mara
It doesn’t matter how much you pay the miners, the nodes won’t verify an invalid transaction.
Nodes can be tricked.
https://mempool.space/block/0000000000000000000515e202c8ae73c8155fc472422d7593af87aa74f2cf3d
Where is the trick?
Did you see the 4mb jpg?
Looks like a trick to me
Can be considered a trick, but it’s still a valid tx
3.96?
Its a valid transaction
Yeah I know I was saying not a backend deal with Mara because nodes wouldn’t verify it if invalid
👍
It’s a repeat of the bigger block debate
What do you mean?
The nodes wouldn't validate the bigger blocks that hard forked into BCH
The blocksize war of 2017
I know what the blocksize war is. I’m curious as to why you say this transaction is similar? Because this transaction is valid.
I didn't say the transaction was similar
What is similar is that nodes won't verify an invalid transaction even if miners do
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Mempool has it labeled as 'Seen in Mempool'
This isn’t “OP_CAT” at all, they just put the OP_SUCCESS value in a script. This is kinda misleading BS
Yep.
its so hard isnt it
interesting