BitCoin is basically a digital ledger system, allowing for keeping transactions based upon cryptographic signatures in a decentralised database, ensuring the transaction was initiated by the person owning the private key. From a philosophical point of view, it's simply authentication and authorisation based upon a private asymmetric key, period! What if I told you the same idea could easily be transferred to code in general. As in, keeping a ledger of invocations towards some HTTP endpoint, where the client decides what code the server should execute? The obvious example can be found below.
transfer.money
to-account:1234567890
You'd have to be pretty stupid to not see the use case for the above snippet, especially considering it's arguably (probably) the foundation of Revolut, a FinTech company, threatening to driver every single European bank out of business these days.