Bitcoin, probably the most well-known cryptocurrency, peaked at almost US$20,000 last December but fell back to under US$3,000 in June.
Online Blockchain developed six coins
It has since recovered slightly although it still trades significantly below its all-time highs of around US$6,400.
Online Blockchain recorded a loss of £258,000 for the 12 months ended June 30 2018, compared with a profit of £20,000 for the year before. Revenue plunged to £56,000 (2017: £98,000).
“In 2018, the Blockchain bubble burst and the market price for Crypto-assets has fallen back a long way,” said chief executive Clement Chambers.
“While this is undoubtably disappointing in the short term, we firmly believe Blockchain technology has a huge future.”
Online Blockchain, which was known as On-Line PLC until last December, has developed six coins, including PlusOne, which is used by ADVFN to reward audience retention. Its price has jumped to 9 cents from its May lows of 2 cents.
Shares were down 17.3% to 22.8p in mid-morning trade.