StarkWare launches Catnet, the first phase of its Bitcoin expansion plan. Golden Finance reported that StarkWare announced the launch of Catnet, the first phase of its Bitcoin expansion plan. Catnet is a custom Bitcoin Signet with OP_CAT enabled for testing its implementation of the Bitcoin Circle STARK validator. Catnet is now live, and users can create wallets, claim some test Bitcoins, and develop Bitcoin scripts. The next step is to launch a $1 million OP_CAT security fund to accelerate all research.