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W5M0MpCehiHzreSzNTczkc9d

What on earth can this string mean: ‘W5M0MpCehiHzreSzNTczkc9d’? This occurs in the XMP packet header:


This is a companion discussion topic for the original entry at https://0-www-crossref-org.lib.rivier.edu/blog/w5m0mpcehihzreszntczkc9d/