Return 32-byte block hash from eth_getFilterChanges to ensure EVM compatibility

[romangzz]

Description:

Ensure eth_getFilterChanges returns a 32-byte block hash to match Ethereum's expectations.

• Truncate Hedera's 48-byte block hash (from mirror node record files) to 32 bytes
• Aligns with Ethereum's EVM compatibility requirements
• Enables valid usage of returned hashes with eth_getBlockByHash
• Fixes compatibility issue affecting downstream clients/tools

Notes for reviewer:

Previously, eth_getFilterChanges returned 48-byte block hashes, causing eth_getBlockByHash to fail with a parameter validation error. This PR ensures that only the first 32 bytes are returned, complying with Ethereum's JSON-RPC spec.

Example of uncorrected output response:

{
    "result": [
      "0x3c08bbbee74d287b1dcd3f0ca6d1d2cb92c90883c4acf9747de9f3f3162ad25b999fc7e86699f60f2a3fb3ed9a646c6b"
    ],
    "jsonrpc": "2.0",
    "id": 1
}

Example of corrected output response:

{
    "result": [
        "0x3c08bbbee74d287b1dcd3f0ca6d1d2cb92c90883c4acf9747de9f3f3162ad25b"
    ],
    "jsonrpc": "2.0",
    "id": 1
}

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

🎉 Snyk checks have passed. No issues have been found so far.

✅ security/snyk check is complete. No issues have been found. (View Details)

✅ license/snyk check is complete. No issues have been found. (View Details)

[quiet-node]

Hey @romangzz, thanks so much for the PR great catch indeed! Could you kindly include some links to documentation, if any, supporting this update like from official Ethereum's JSON-RPC spec or whatnot? It’ll help provide context for future reference. If possible, please add the links to the PR description for better clarity.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...vices/ethService/ethFilterService/FilterService.ts	50.00%	1 Missing ⚠️

@@           Coverage Diff           @@
##             main    #3863   +/-   ##
=======================================
  Coverage        ?   50.66%           
=======================================
  Files           ?       83           
  Lines           ?     4767           
  Branches        ?      972           
=======================================
  Hits            ?     2415           
  Misses          ?     1990           
  Partials        ?      362           

Files with missing lines	Coverage Δ
...vices/ethService/ethFilterService/FilterService.ts	17.50% <50.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.