Design a secure token migration for:
Old Token:
```
${{OLD_TOKEN_CODE}}
```
New Token Requirements: ${{NEW_REQUIREMENTS}}
Migration Timeline: ${{TIMELINE}}
Security design:
1. Migration mechanism options
2. Snapshot security
3. Claim process design
4. Deadline handling
5. Unclaimed token handling
6. Exchange…Premium Prompt
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[{OLD_TOKEN_CODE][{NEW_REQUIREMENTS][{TIMELINE]