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feat: verification of side_z in AcceptLink #2540

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feat: verification of side_z in AcceptLink #2540

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@ANISH-SR ANISH-SR commented Jan 1, 2026

Summary of Changes

  • Added an explicit check in process_accept_link to enforce link.side_z_pk == *side_z_account.key.
  • The instruction now fails early with DoubleZeroError::InvalidAccountOwner if the Side-Z account does not match the link.
  • Prevents accepting a link with a Side-Z device that differs from the one recorded on-chain.

Testing Verification

  • Existing tests pass.

Closes #2214

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Verify that link.side_z_pk == side_z_account.key in AcceptLink

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