Validates the structural message-shape of a single DTC corporate-action event message (notification / election / allocation) against the ISO 20022 field set carried by DTCC Important Notice 23890-26's legacy corporate-actions message format decommission. This is message-shape validation only; entitlement, dividend, rights, and split arithmetic is a separate node, corporate-action entitlement recompute (art-547), which chains from this node's output.
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data; use synthetic or anonymised inputs only. CUSIP, DTC participant number, and event dates are STRUCTURAL routing fields, not personal data. Do not enter real beneficial-owner records.