Determine which country's or U.S. state's apostille-issuing authority operates a Hague e-APP-compliant electronic register (e-Register), and how to query it to verify a specific apostille.

Steps

1. Fetch hcch.net/en/instruments/conventions/specialised-sections/apostille/operational-e-registers for HCCH's current, numbered 'Current list of operational e-Registers,' spanning roughly 60 countries/jurisdictions (as of this research) plus a dedicated United States sub-list.
2. For the United States specifically, note the currently listed states with operational e-Registers: Arkansas, California, Colorado, Delaware, Minnesota, Montana, Nevada, New York, North Carolina, Rhode Island, Tennessee, Texas, West Virginia, and Washington — each with its own direct verification URL.
3. Check for footnote markers on any entry: a single asterisk (*) means the e-Register implementation is 'not yet fully e-APP compatible,' and a double asterisk (**) means verification is QR-code-based only with no direct browsable link.
4. Use the specific issuing authority's e-Register link (e.g., a country's Ministry of Foreign Affairs or a U.S. state's Secretary of State site) to verify an individual apostille using the certificate details printed on it.
5. For any U.S. state or country NOT on this list, assume there is no electronic verification option and rely on the traditional paper-based or embassy/consular verification process instead.