The Czech central bank says it has bought a swag of bitcoins and other blockchain-based digital assets to gain experience with digital markets, and will evaluate the project in two to three years.

The $US1 million ($A1.5 million) portfolio is mostly made up of bitcoins but also includes a US dollar-based stablecoin and a tokenised deposit, all bought through an exchange it said, without giving any more details.

"The purpose of the portfolio is to gain practical experience with holding digital assets and to implement and test the necessary related processes," the central bank said.

It will be held separately from the bank's international reserves, and will not be actively increased, it added.

"In the test portfolio, the central bank will test the whole chain of processes associated with

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