Trustless Settlement
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In order to achive trustless settlement for Citrea, there needs to be opcode change(s).
Mainly, an opcode that can verify ZK proofs and a would be required to implement completely trustless Bitcoin settlement. Specifically, it is theoretically possible to implement a trustless bridge using OP_CAT opcode, if activated.
In the current architecture, BitVM/Clementine provides a trust-minimized settlement with 1-of-N honest minority trust assumption - which is a great improvement over the existing insecure implementations of sidechains. In case a suitable opcode is added to Bitcoin, Citrea will also adopt a cheaper/securer/faster/trustless solution if possible.