chore: Add polkadot evm mainnet example

[NicoMolinaOZ]

Summary

• Transaction sent on mainnet using relayer:

https://blockscout.polkadot.io/tx/0x0a36526105d1bd1b006fdcb2fd82cc0ad0b6367596dbaabf3df1c97a4ca880a3

Testing Process

Checklist

• Add a reference to related issues in the PR description.
• Add unit tests if applicable.

Note

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Summary by CodeRabbit

• New Features

  • Added Polkadot hub mainnet network support with Ethereum Virtual Machine compatibility. Configuration includes multiple RPC endpoints for reliability and redundancy, alongside blockchain explorer integration for transaction verification and network monitoring

• Chores

  • Reformatted Polkadot hub testnet network configuration

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7a9568b6-44ca-43a9-a6fb-586f907f54e5

📥 Commits

Reviewing files that changed from the base of the PR and between 672ee6d and 41d6cf2.

📒 Files selected for processing (1)

• config/networks/polkadot.json

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Walkthrough

A new Polkadot hub mainnet network configuration was added to the network settings file with EVM RPC and explorer URLs, along with blockchain parameters. The existing testnet configuration was reformatted to use inline array syntax without altering its values.

Changes

Cohort / File(s)	Summary
Network Configuration config/networks/polkadot.json	Added mainnet entry for polkadot-hub (chain_id: 420420419) with RPC endpoints, Blockscout explorer, DOT symbol, 6 confirmations, and 2400ms block time. Reformatted testnet entry to use inline array syntax.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A new network hops into view,
Polkadot hub, shiny and new!
RPC paths lead to blockchain delight,
With confirmations set just right,
Our config now bounces with blockchain might! 🌐

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: adding a Polkadot EVM mainnet configuration entry to the network config file.
Description check	✅ Passed	The description includes all required template sections (Summary, Testing Process, Checklist) with the Summary providing a transaction reference demonstrating mainnet usage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-polkadot-evm-mainnet-example

📝 Coding Plan

• Generate coding plan for human review comments

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 OpenGrep (1.16.4)

config/networks/polkadot.json

┌──────────────┐
│ Opengrep CLI │
└──────────────┘

�[32m✔�[39m �[1mOpengrep OSS�[0m
�[32m✔�[39m Basic security coverage for first-party code vulnerabilities.

�[1m Loading rules from local config...�[0m

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[tirumerla]

lgtm