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RE: base64 encryption explained - photographs posted directly on the blockchain
Prestel
Prestel (abbrev. from press telephone), the brand name for the UK Post Office's Viewdata technology, was an interactive videotex system developed during the late 1970s and commercially launched in 1979. It achieved a maximum of 90,000 subscribers in the UK and was eventually sold by BT in 1994.
The technology was a forerunner of on-line services today.