Add BESCHyperchain

[BESCLLC]

This PR adds full support for BESC Hyperchain (Chain ID 2372) to the viem chains package. It introduces a new chain definition containing: • official HTTPS + WSS RPC endpoints • native currency metadata • canonical block explorer • 3-second block time • verified Multicall3 contract + deployment block • proper EIP-155 namespace alignment

This integration enables developers to use viem with BESC Hyperchain out-of-the-box, without needing to manually define a custom chain configuration.

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Why is this needed?

BESC Hyperchain is a production EVM L1 with its own RPC infrastructure, explorer, validator set, and active dApps. Adding it to viem improves compatibility across: • dApps • wallets • SDKs • RPC frameworks • tooling libraries

Many libraries depend on viem’s chain registry to enable auto-configuration, multisig support, routing, RPC calls, and wallet connections.

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Alternatives considered

Before submitting this PR, I explored: • using defineChain() locally in each codebase • asking downstream libraries to manually integrate BESC • relying on user-defined chain overrides

These approaches create fragmentation and inconsistent chain definitions across developers. Adding BESC Hyperchain directly to viem provides a single authoritative source and improves ecosystem consistency.

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Parts that may need reviewer attention • Confirmation that the field naming follows viem’s current chain conventions • Multicall3 deployment block: 164313 • RPC/WebSocket endpoints: • https://rpc.beschyperchain.com • wss://rpc.beschyperchain.com/ws • Explorer API path follows viem-accepted formatting (/api) • Block time: 3000 (3 seconds)

All values are verified and match the live chain configuration.

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Additional Notes • The testnet will be submitted in a separate PR unless maintainers prefer both in one submission. • All naming and formatting conventions follow existing chain definitions in the repository.

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🙏 Thank you for reviewing!

This PR aligns with viem’s contribution guidelines and ensures seamless developer support for the BESC Hyperchain ecosystem.

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Latest commit: 81869ec5b778920014afe3abb5ad3ae950cf71c4

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[jxom]

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