Elon Musk Changes Twitter Bio to '#bitcoin'

Elon Musk, CEO of Tesla and SpaceX, changed his Twitter bio to simply '#bitcoin,' causing the price to jump nearly 20%.

The event is retained as a recognizable cultural marker of the period. Its value is in reconstructing how Bitcoin and the wider digital-asset phenomenon were being discussed and experienced in 2021, without implying a protocol or legal effect that the event did not have.

Placed in the broader 2021 chronology, the event helps show how Bitcoin was simultaneously becoming a subject of institutional finance, public policy, technology development and mass culture. Its inclusion reflects the specific historical development described above rather than a claim that every related market reaction was caused by this event alone.