$BTC ZetaChain, StarkNet, zkSync, etc. Obtain qualifications through testnet interactions, requiring completion of cross-chain transactions, contract deployments, and other tasks.

- **Strategy**: Prioritize projects with mature technology and strong capital support (such as LayerZero, which is invested by a16z), regularly participate in testnet tasks, and retain interaction records.

2. **Ecosystem Contribution Airdrop**

- **Examples**: Babylon Network requires users to stake Bitcoin or participate in GitHub open source contributions; Abstract rewards active users through daily usage and XP point system.

- **Strategy**: Long-term participation in governance voting (such as Jupiter's second round airdrop), providing liquidity, or contributing to tool development.