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Ambiguous identities are quarantined and listing announcements do not guarantee liquidity or return.","calculation_version":"coinnudge-listing-history-coverage-2.0","evidence_columns":[["measurement","Measurement"],["source","Source / audit layer"],["event_status","Status"],["records","Count"],["first_observed","First observed UTC"],["last_observed","Last observed UTC"],["count_unit","What one count means"]],"metric_cards":[["254","current announcement IDs"],["12168","observation envelopes"],["254","unique semantic versions"],["0","actual content revisions"]],"summary":{"answer":"The current catalog contains 254 unique announcement IDs across 3 named sources. 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