Valereum, listed on London's Aquis Exchange, said it will need approval from Gibraltar regulators to allow listed instruments on the GSX access to a regulated pool of crypto capital.

It gave no price for the transaction.

"The GSX will be the world's first exchange to create a seamless and fully regulated bridge that links the fiat and crypto markets," Valereum said in a statement.

"This will give listed instruments on the GSX access to a regulated pool of crypto capital that is not available anywhere else, and it will give crypto currency holders the ability to have a direct, verifiable holding in fiat securities."

Valereum announced last November it had signed an option to acquire up to 80% of GSX, subject to approval from the Gibraltar Financial Services Commission. Friday's announcement increases the holding to 90%.

Valereum acquired Gibraltar fund and trusts services group Juno in December to underpin the bridge between crypto and fiat currencies.

(Reporting by Huw Jones, Editing by Louise Heavens)