Who is OP_CAT?

A cat written into Bitcoin by Satoshi himself hidden in the code since 2009.
Disabled in 2010, it vanished for years.
Now, the cat wakes up.



The Code Behind the Cat

OP_CAT was an opcode in Bitcoin’s early script language that joined two data values on the stack.



Run

Satoshi wrote the cat. We run it togetherCA :
0x9fd58d46a6e2168e2478de0ecc1515bd64134444