1. Token-2022 Extension Overhead
Solana Token-2022 (Token Extensions) introduces advanced features like transfer fees, interest-bearing tokens, and confidential transfers. Because these extensions append metadata to the account, Token-2022 accounts often exceed the legacy 165 bytes, requiring larger rent-exempt deposits.
2. Dual Program ID Architecture
Legacy tokens live under TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA, while modern extension tokens live under TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb. Reclaim engines must query both program IDs in parallel to identify all closeable accounts.
3. Safe Account Closing
Closing a Token-2022 account requires referencing the correct program ID in the instruction. Solwitches detects both program types and packages the appropriate instruction for each account in the transaction batch.