Update to hardhat 2.8.5 and use eth_getProof from EDR

[Amxx]

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

[openzeppelin-security-agent]

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Project	Scan	Issues	Details	Updated
Openzeppelin Contracts	🟡 Queued	—	View	Feb 10, 2026, 12:57 PM (UTC)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3121a19

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​hardhat@​2.28.4 ⏵ 2.28.5				+1

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[socket-security]

All alerts resolved. Learn more about Socket for GitHub.

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

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[coderabbitai]

Walkthrough

The PR updates the hardhat devDependency from ^2.28.0 to ^2.28.5 in package.json. The TrieProof.test.js test suite is refactored to replace external Anvil process spawning with a fixture-based in-process approach. The new fixture deploys $TrieProof, StorageSlotMock, and CallReceiverMock contracts. Test setup now uses batchInBlock with plain transaction generator arrays, direct provider calls for eth_getProof operations, and BlockTries instance conversion for block data. Cryptographic expectations are updated to use '0x' string representations instead of ZeroBytes constants.

Possibly related PRs

• Add test helper for Trie Proofs #6207: Modifies TrieProof.test.js to use BlockTries helper for manual trie and proof handling in the same test file.
• Add TrieProof library #5826: Relates to TrieProof test suite modifications where this PR refactors the test structure to use fixtures while the related PR introduces the TrieProof library.
• Target Osaka EVM during tests #6217: Updates hardhat devDependency version in package.json alongside this PR's version bump.

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	❓ Inconclusive	The description only contains a PR checklist without substantive explanation of the changes or their purpose.	Add a meaningful description explaining why Hardhat was updated and how the eth_getProof integration improves the test infrastructure.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes both main changes: updating Hardhat to 2.8.5 and switching to eth_getProof from EDR, which match the changeset modifications.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update/hardhat-2.8.5

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