Copper Riverlight (Built for Base)

Deployed on Base Mainnet.

Copper Riverlight is a compact browser-based reference project that validates Base connectivity (chainId 8453 / 84532), connects a Coinbase Wallet, and performs read-only inspections of balances and blocks with Basescan links.

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Base ecosystem alignment

Supported networks:

Base Mainnet
chainId (decimal): 8453
Explorer: https://basescan.org

Base Sepolia
chainId (decimal): 84532
Explorer: https://sepolia.basescan.org

The application explicitly targets Base networks and uses official Base RPC endpoints.

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Repository structure

• app/copper-riverlight.ts
  Browser-based script for wallet connection and Base RPC inspection.

• contracts/
  Solidity contracts deployed to Base Sepolia for testnet validation:

  • contract.sol — minimal contract used to validate deployment and verification flow
  • arrays.sol — simple stateful contract for interaction testing
  • mapping.sol — lightweight registry contract used for read-only queries

• package.json
  Dependency manifest referencing Coinbase SDKs and multiple Base repositories.

• README.md
  Technical documentation and deployment records.

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Installation and execution

Install dependencies using Node.js.
Serve the project with a modern dev server and open it in a browser.

Expected result:

• Wallet address and ETH balance displayed
• Active Base chainId visible
• Latest block data readable
• Basescan links provided

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Libraries used

• @coinbase/wallet-sdk
  Wallet connection and account access.

• @coinbase/onchainkit
  Base-aligned primitives and account abstraction tooling references.

• viem
  Read-only RPC client for Base Mainnet and Base Sepolia.

• Base GitHub repositories and Coinbase GitHub repositories
  Included as dependencies to reflect ecosystem linkage and tooling alignment.

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What the script does

1. Connects a Coinbase Wallet
2. Validates Base chainId (8453 / 84532)
3. Reads ETH balances for arbitrary addresses
4. Fetches latest block metadata
5. Outputs Basescan links for verification

All interactions are strictly read-only. No transactions are broadcast.

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License

MIT License

Copyright (c) 2025 petiole-planks

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Author

GitHub: https://github.com/petiole-planks
Email: petiole.planks-0x@icloud.com
Public contact: discord/melar3401

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Testnet Deployment (Base Sepolia)

As part of pre-production validation, one or more contracts may be deployed to the Base Sepolia test network to confirm correct behavior and tooling compatibility.

Network: Base Sepolia
chainId (decimal): 84532
Explorer: https://sepolia.basescan.org

Contract #1 address:
0xaA7468DB00dBe29a9C2A3a4Db56D6B0c9cb2868e

Deployment and verification:

• https://sepolia.basescan.org/address/0xaA7468DB00dBe29a9C2A3a4Db56D6B0c9cb2868e
• https://sepolia.basescan.org/0xaA7468DB00dBe29a9C2A3a4Db56D6B0c9cb2868e/0#code

Contract #2 address:
0x301E949D85E8FdEE2638Bc4bE530ab34D5f3123f

Deployment and verification:

• https://sepolia.basescan.org/address/0x301E949D85E8FdEE2638Bc4bE530ab34D5f3123f
• https://sepolia.basescan.org/0x301E949D85E8FdEE2638Bc4bE530ab34D5f3123f/0#code

Contract #3 address:
0xcB312a05465c1D2e48e33D80561185531FEdDDB4

Deployment and verification:

• https://sepolia.basescan.org/address/0xcB312a05465c1D2e48e33D80561185531FEdDDB4
• https://sepolia.basescan.org/0xcB312a05465c1D2e48e33D80561185531FEdDDB4/0#code These testnet deployments provide a controlled environment for validating Base tooling, account abstraction flows, and read-only onchain interactions prior to Base Mainnet usage.