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Assume there is a single Oracle managing all transactions. Do NOT worry about multisigs, approvals, etc.
No validation on either chain is required.
Do not worry about oracle fee imbalances.
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Diagram link: https://drive.google.com/file/d/12f8iOoZjj1txZCJprpuQ5VFb8Ejpc9Bp/view?usp=sharing
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