Bitcoin is nursing losses after its worst weekly plunge in almost a year and on one view its longer term outlook could be even worse because of environmental concerns and tightening regulations.

The sheer amount of energy needed to mine Bitcoin and the prospect that governments will create more obstacles for the largest cryptocurrency point to the token losing “most of its value over time,” BCA Research Inc. said.

The expense and slowness of Bitcoin transactions make it “unsuitable as a medium of exchange,” BCA Research Chief Global Strategist Peter Berezin wrote in the report released Friday.

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