Use when an agent must check a crypto wallet against the digital currency addresses on the U.S. Treasury OFAC SDN list before paying or accepting funds. Input: address (EVM matched on every EVM chain; BTC, TRX, SOL...), optional chain. Output: JSON listed yes/no, SDN entry, programs, listed currency and network, OFAC link, list as-of date, data age. Not a legal determination. Example: ?address=0x098B716B8Aaf21512996dC57EB0615e2383E2f96

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