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Presidency of Religious Affairs (Diyanet), Turkey
Turkey's top religious body
"Said in November 2017 that buying and selling virtual currencies "is not compatible with religion at this time.""
In November 2017 the Diyanet said buying and selling virtual currencies "is not compatible with religion at this time" because their valuation is open to speculation, they can easily be used for illegal activity such as money laundering, and they are not under the state's audit and supervision.
Sources
More rulings, with sources, are collected on the fatwa library.