The European Central Bank and its counterparts in the UK, US, China, and India are exploring a new form of state-backed money built on similar online ledger technology to cryptocurrencies such as bitcoin and ethereum. So-called central bank digital currencies (CBDCs) envision a future where we’ll all have our own digital wallets and transfer money between them at the touch of a button, with no need for high-street banks to be involved because it all happens on a blockchain.