The QRZ Logbook is a double-blind system. Of course, there are a lot of additional fields in a QSO report, but these are the key values for QSO matching.
Mode - both QSO reports report the same mode in use. Band - both QSO reports report the same band in use. Date/Time (UTC) - both QSO reports must have the same timestamp, +- 30 minutes. Call Signs - both QSO reports must name the same two call signs. A match is declared when two separate records in the database match these key details: The QRZ system is continually searching the database for matches. On a typical day, as many as 200,000 new QSOs arrive, and around 88,000 new confirmations are produced. Users of the QRZ Logbook enjoy a 40%+ confirmation rate on their QSOs. The cloud-based QRZ Master Logbook contains over 300,000 logbooks from individual hams worldwide. 
Each member may create and populate one or more logbooks for their personal or club use. The QRZ Logbook System is a master collection of QSO records from all participating members. Help Desk, for accounts, lost passwords, etc.
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