Reuters reported that the currency hit US$50,602 and then fell back to US$49,100, adding that this meant it had risen by about 70% in 2021.
A large percentage of the gain in value has come after electric vehicle manufacturer Tesla said it had bought bitcoin worth US$1.5 billion.
Some of the other well-known Americans to endorse the digital currency have been Twitter chief Jack Dorsey and rapper Jay-Z.
Reuters quoted George Lagarias of global audit, accounting and consulting group Mazars as saying the degree of volatility displayed by bitcoin was cause for concern.
“We feel that, due to its volatility, bitcoin lacks many of the established qualities that make up ‘money’, such as being a stable store of value and unit of account," he said.
“As an intangible asset with no yield or practical use, save for a few organisations who accept it as payment, it is really just demand (against a predictable supply) which determines its price.
“But whereas the price of bitcoin has risen to the skies, what value one gets from holding it in a long-term portfolio still remains subject of much debate.”