What is the fine-grained topic of the following text: AirTM Inc. (“AirTM”), a FinCEN-registered global peer-to-peer network that connects over 200 banks and e-money systems, announced that it is expanding its reach to include ten major blockchains, including Bitcoin, Bitcoin Cash, Ethereum, Litecoin, Zcash, Ripple, Monero, Dogecoin, and Tether, with more to be added throughout 2018. Only return the topic.
AirTM's expansion to include ten major blockchains