Meet the New Backend - Same as the Old?
One of the nice things about developing blockchain applications is that all of our front-end skills apply in this new area of tech. Your React/Angular/Vue skills, your UX/UI and CSS skills, you’ll use all of those when you build a blockchain application.
The difference is that instead of a database or server, you’ll put key parts of your logic into the blockchain. At a very superficial level, you can think of the blockchain as a new server storing your logic and database.
That’s very superficial, though, because storing anything at all on the blockchain is fantastically expensive. Imagine you’ve gone back in time to the 1970s, when programmers had to worry about kilobytes of text. They had to delete text generated by one part of their program in order to free up space to run the rest of their program!
As a result, you can’t even store data structures to iterate over, because you cannot store a list that could grow without bound. This is a common mistake that new Solidity programmers make.
Of Oracles and APIs
One interesting point to draw out from this article: yes you must “trust” the oracle, but the oracle is an oracle because of a cryptoeconomic scheme. As a result these new APIs lack a decentralized point of failure - they should be more resilient and reliable.
A blockchain executes code in public. Because you can see what it’s doing, you don’t need to blindly trust that it’s doing the right thing. Personally, I prefer to say blockchain schemes build trust, instead of removing trust. To work together as humans, we need to build trust on many different levels. If we can offload some of that trust-building work to the blockchain, we can focus on building interpersonal trust and get down to work faster and more effectively.
At any rate, the blockchain works because it’s backed by cryptoeconomics - that is, we pay people with tokens to run it. In the same way, we pay people for reporting accurate information to an oracle, and we penalize them for not reporting it.
At the time of this writing, few oracles exist. We’ll need many, many more to enable all the blockchain applications that we want to build. And we’ll want to build a TCR to curate a list of the best oracles, so that developers can look up the best oracles to use as APIs.