Pneumatic tubes were being alleged to revolutionize the world but have fallen by the wayside. Other than in hospitals. Transactions are blocked together within an irreversible chain: a blockchain Each and every added block strengthens the verification in the prior block and as a result the entire blockchain. CertiK, https://financefeeds.com/emir-refit-comes-into-effect-in-the-uk-on-september-30th/