feat: contract reference validation

[lklimek]

Issue being fixed or feature implemented

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How Has This Been Tested?

Breaking Changes

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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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[lklimek]

@QuantumExplorer how to set the contract processing (fetching) cost?