A new transaction is added to the system. It is then relayed to a network of computers located around the world. The computers then solve equations to ensure the authenticity of the transaction.
Servers in 105 countries including the UK
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Both Aldi and Lidl are a growing presence in the highly competitive British supermarket field. Aldi said in January that it plans to open 40 new stores in the UK this year. It currently employs 45,000 people.
Nature, Published online: 24 February 2026; doi:10.1038/s41586-026-10293-1
Waitrose, which is owned by the John Lewis Partnership, said it would replace its mackerel products with "responsibly sourced" alternatives in order to "make a stand against overfishing and support long-term health and sustainability of fish stocks".