Foreign TX Validation: Must Have's before shifting focus

[anodar]

Background

This is the tracking issue for all the blockers before we shift our focus from foreign tx validation to offchain requests, in the order of priorities

• [P1] Investigate charge for storage: [Audit] Investigate if verify_foreign_transaction should charge for storage. #3998
• [P1] Whitelist enforcement https://github.com/near/mpc-private/issues/558
• [P1] Foreign tx validation should return errors instead of timing out when RPC requests fail due to invalid transactions: Foreign tx validation should return errors instead of timing out when RPC requests fail due to invalid transactions #2677
• [P1] Observability: latency metrics for foreign chain tx validation requests, etc.. Per-provider RTT observability for foreign-chain RPC #4152
• [P1] Document procedure on supporting new chain. Document procedure on supporting new chain #4272
• [P2] Revisit foreign chain config registration (privacy concern that it exposes RPC providers each node uses) Revisit foreign chain config registration #3627

User Story

No response

Acceptance Criteria

All of the issues in the task list are addressed before we change our focus to offchain requests.

Resources & Additional Notes

No response

[netrome]

Thank you! 🙏