支持两类接口：

• ERC-20 Interface — as described in the XC-20 overview page
• Permit Interface (EIP-712 compliant) — as described in the XC-20 overview page

Setup Chains

Create External XC-20

Relay Chain ↔ Parachain

Parachain ← Relay Chain Native Token → Parachain

Parachain ← Parachain Native Token → Parachain