The claim has two parts: first, that there is a dispute between Blockchain Association and Citadel; second, that it centers on an SEC innovation-related exemption. The strongest primary evidence for the exemption itself comes from the SEC's 'Remarks at the Investor Advisory Committee Meeting', where Paul Atkins says the Commission would soon consider an innovation exemption for certain tokenized securities. 'Regulation Crypto Assets: A Token Safe Harbor' further confirms the SEC was actively shaping crypto-related exemptive and safe-harbor policy. On the dispute component, direct fetches of The Block and X posts failed, so validation is weaker. However, the search result for 'DeFi vs. Wall Street: Blockchain Association challenges Citadel over SEC innovation exemption' directly matches the user's framing, and fetched secondary reports from PANews and BlockBeats, both explicitly attributing their information to The Block, describe industry controversy over the same SEC innovation exemption and conflict between crypto advocates and traditional finance institutions. Because the dispute itself is supported mainly by secondary/reporting metadata rather than a successfully fetched primary article or original letter, the claim is best rated likely true with medium confidence rather than high confidence.