Miami is spending millions on a new rental assistance program, but the funding source, MiamiCoin, is only vaguely understood by city leaders.

Philadelphia CIO Mark Wheeler said Mayor Jim Kenney has given his approval to start considering a relationship with CityCoins, which has also minted digital currencies for Miami and New York.

CityCoins and STX plan to launched an accelerator designed to help companies build blockchain-based civic technology applications.

Austin, Texas, could become the third city with its own cryptocurrency, but officials there said they're still researching the technology.

Miami Mayor Francis Suarez said the city will partner with cryptocurrency exchanges to provide residents with digital wallets.

Philadelphia CIO Mark Wheeler said the city is calling for blockchain and cryptocurrency experts to share their ideas for local government applications of the technologies.

Technology officials say they're interested in distributed-ledger technology, but that they have a few questions before their cities start investing.

CityCoins founder Patrick Stanley said he's planning to expand to new locations.

Commissioners voted to allow the city to dip into proceeds of the cryptocurrency, which so far total $4.3 million in value.