fix: validate proof of work on block acceptance#115

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StabilityNexus:mainfrom

Jiyacodex:test-pow-validation

Commits on Jul 6, 2026

fix: validate proof of work on block acceptance

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fix: handle invalid proof of work explicitly

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style: remove trailing whitespace

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fix: validate difficulty before proof-of-work checks

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Commits on Jul 16, 2026

merge: incorporate upstream timestamp validation and CI workflows

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test: anchor _chain_with_tx timestamps to previous block instead of wall-clock

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Commits on Jul 18, 2026

Validate serialized block hashes during deserialization

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