goodsong.dev

https://goodsong.dev/verify/filing

Verify an SEC filing: given a filer's CIK and a claimed accession number, does that filing actually exist, and does its form type/filing date match what's claimed? Checked against SEC EDGAR's submissions API. Catches a fabricated or misattributed filing citation, including a real-looking accession number paired with an invented form type or date.

last updated: Oct 8, 2026 · type: http · x402 v2

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