A single Danske Bank branch in Estonia reportedly laundered $235bn over 8 years - more than the total market cap of every cryptocurrency combined.

From a bank that publicly denounced cryptocurrencies back in March, this revelation has the potential to renew investor interest in decentralised ledger technology, as customers get a stark view of the downside of traditional, centralised control.

Based on blockchain technology, cryptocurrencies generally operate on a mechanism of trust; no single authority maintains the integrity of the system, which instead relies on the consensus of a large network to validate transactions.