feat(core): implement EIP-2935 #29465 #30924

[gzliudan]

Proposed changes

implement EIP-2935

Ref:

• core: implement EIP-2935 ethereum/go-ethereum#29465
• core: fixes for Prague fork in GenerateChain ethereum/go-ethereum#30924

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR implements EIP-2935, which provides access to historical block hashes from state via a system contract. The implementation follows the EIP specification closely, storing block hashes in a ring buffer contract deployed at a specific address (0x0000F90827F1C53a10cb7A02335B175320002935) when the Prague hard fork activates.

Changes:

• Added EIP-2935 history storage system contract that maintains a ring buffer of the most recent 8,191 block hashes
• Implemented one-time backfilling of recent block hashes when Prague activates on existing networks
• Integrated the system contract calls into all block processing paths (mining, state access, tracing, and test utilities)

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
params/protocol_params.go	Defines the history storage contract address, bytecode, and window size (8,191 blocks); adds SystemAddress for system calls
core/state_processor.go	Implements ProcessParentBlockHash function that deploys the contract, performs backfilling, and stores parent hashes via system calls
core/state_processor_test.go	Adds comprehensive tests for ProcessParentBlockHash including Prague guard checks, backfilling with missing history, and code mismatch detection
miner/worker.go	Integrates parent block hash processing during block mining when Prague is active
eth/tracers/api.go	Adds parent block hash processing in three tracer endpoints (traceChain, IntermediateRoots, traceBlock) for accurate state reconstruction
eth/state_accessor.go	Processes parent block hash when reconstructing historical state for transaction replay
core/chain_makers.go	Updates test chain generation to include EIP-2935 processing and adds Engine() method to fakeChainReader for ChainContext interface compliance
core/genesis.go	Pre-deploys history storage contract in developer genesis; cleans up incomplete comment
common/big.go	Adds U2560 constant (uint256 zero) used in EVM calls
docs/upgrade.md	Documents Prague/EIP-2935 upgrade notes including deployment strategy and backfilling behavior
docs/README.md	Adds link to upgrade notes documentation

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