Bitcoin's 'OP_CAT' Possibilities Teased in StarkWare Test Project
Briefly

Layer-2 developer StarkWare showcased how zero-knowledge proofs could be implemented on Bitcoin using OP_CAT on the Signet testing environment.
OP_CAT aims to bring smart contract programmability missing in Bitcoin, with StarkWare championing its approval for the benefits it offers to the Bitcoin community and blockchain ecosystem.
Read at Coindesk
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