Bitcoin

Banks have watched with alarm as customers' deposits have flowed into cryptocurrency wallets. They are now working with their software vendors to build the infrastructure that's needed to offer digital currency services of their own.

The Boston trust bank has set up a division called State Street Digital, led by Nadine Chakar, that will help customers invest in cryptocurrencies. It will also develop blockchain and smart contract technology and the ability to tokenize assets.

Square Inc. Chief Executive Jack Dorsey said the digital payments company is considering building a Bitcoin hardware wallet, a device that holds the digital currency but isn’t connected to the internet.

Unchained Capital, a Bitcoin-based custody-service provider and lender, has raised $25 million in funding, valuing the company at $125 million.

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The money transfer company is working with Coinme to provide a way for bitcoin users to access their profits — or cut their losses.

The sudden plunge — and recovery — of bitcoin's value highlights the problems in using such volatile currencies in commerce.

DMG Blockchain is using hydro power to mine bitcoin. It's part of a movement to support crypto without straining local power grids or polluting the environment.

MoneyGram will offer a service for the conversion of digital currency into cash at its retail locations in the U.S. through a partnership with cryptocurrency exchange Coinme.

The risk is growing that criminals or hostile nations could use quantum computing to hack into the ledger systems that control bitcoin and other digital currencies.