Add ENSIP: ERC-7930 Address Resolution

[nxt3d]

Summary

This PR introduces a new ENSIP for resolving ERC-7930 Interoperable Addresses from ENS names using the ENSIP-24 data() profile.

Motivation

ERC-7930 defines a standardized binary format for representing blockchain addresses across different chains. As multichain applications become more common, there is a need for a universal way to resolve interoperable addresses using ERC-7930. This ENSIP provides a standardized approach for ENS names to resolve to ERC-7930 addresses, complementing existing addr() (ENSIP-1) and addr(coinType) (ENSIP-9) resolution methods.

Approach

This ENSIP defines a Data Key Standard that uses the existing ENSIP-24 data() profile, avoiding the need for new resolver interfaces. The standard specifies:

• Key format: erc7930.address: <chain-identifier> where the chain identifier is a full ERC-7930 Interoperable Address with zero-length address
• Value format: Raw target address bytes (no length prefix) for the target chain
• Clients reconstruct the full ERC-7930 Interoperable Address by combining the chain identifier from the key with the target address bytes from the value

Benefits

• Leverages existing ENSIP-24 infrastructure (no new interfaces)
• Efficient storage format
• Standardized cross-chain address resolution
• Consistent with existing ENS address resolution patterns

Related Standards

• ENSIP-24: Arbitrary Data Resolution (uses data() profile)
• ENSIP-1: Address Resolution (addr())
• ENSIP-9: Multi-chain Address Resolution (addr(coinType))
• ERC-7930: Interoperable Address Format