In 2017, Sergey Nazarov and Steve Ellis started Chainlink. The network went live in 2019. From day one, the total supply of LINK was fixed at 1 billion, with no new coins ever minted. By late 2026, roughly 770 million of them were already out in the open. Those numbers get quoted a lot. They are not the point.
The point is a simple problem with a hard fix. A blockchain is built sealed shut, and that seal is what makes it hard to tamper with. It also means a smart contract cannot check a price, a score, or any fact from the outside world. A lending app still needs to know what collateral is worth, or it cannot tell when a loan has gone bad and must be closed.
Chainlink's answer is to spread the job out. Many independent node operators fetch the same data, report what they found, and the network settles on one answer. The apps pay for that service in LINK, and the operators who did the fetching earn it.
Key points:
- One price feed from one firm would be a weak link — if it breaks or lies, every app trusting it breaks too.
- LINK pays node operators, and locked-up LINK backs the network, with bad data punished by taking part of that deposit.
- The same network also supplies random numbers, scheduled wake-ups, and cross-chain moves through CCIP.
Watch the flows, not the press release. I keep coming back to that test with LINK: are real apps still paying for fresh, honest data, day after day? The feeds just showing up, boring and steady, is exactly what an app moving real money wants.
There are real risks, and they deserve a plain sentence each. Garbage sources can still produce a wrong agreed number. Other oracle networks now chase the same apps, often with lower fees. And LINK itself swings hard with the rest of the market, so anyone holding it for the staking reward still rides that same roller coaster.
I wrote this only to explain the idea in plain words. BitByLine teaches, it does not advise — this is NOT financial advice, and nobody here tells you to buy or sell anything. Whatever you do with your money is your own decision and your own risk, so please do your own research first.
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