Udi Wertheimer, the founder of Taproot Wizards, announced that OP_CAT (BIP-420) will be launched on Bitcoin's official test network "Signet" on Tuesday, and OP_CAT will be launched on the main network later this year. This will allow developers to build advanced OP_CAT applications and conduct real-time testing on the official test network. It is reported that Signet is the preferred test network for Bitcoin developers. Signet operators create blocks every 10 minutes without requiring proof of work. This makes development more predictable and closer to the main network.