Bitcoin price went to all time high 123000$+ and as me you likely saw that on X or binance, CMC and wondered if i had one bitcoin! Alright, now how blockchain will show that price? because in basic blockchains are remote from internet that means blockchain doesn’t know the current price, That means they have no idea what’s happening off-chain — no prices, no weather, no memes. unless someone tell the smart contracts that yes currently btc price moved and the price is now *******$ and we know web3 tokens price specially btc price changes few time in a second so that means someone has to do it continuously to update the price changes.

That’s where one crucial tool comes in: the Oracle. An oracle is the middleman that brings real-world data. Oracle is responsible for correct price update from internet to the blockchain that yes the price is now changed -99% of my alt portfolio😥.

How an oracle works? it’s always like in milli seconed chk the prices of the tokens,coins and let the blockchain knows via API that yes something changed and blockchain update the price. Here is a more easy step by step guide:

oracle.png

  1. It waits for any defi/blockchain if asking for a price update.
  2. Once someone ask for price it checks all the available APIs, website etc.
  3. But, blockchain doesnt understand human language, so oracle convert the info to blockchain compatibility so that blockchain can undersatnd the data and update it accordingly.
  4. Oracle just doesn’t update any random price it validate the data and also send the data a way that no one can temper it (e.g. zkProof)
  5. Not only that oracle can do more than price update or info update it can do off-chain math if needed like finding the median price from 10 sources or rolling a random number for an on-chain game.
  6. After validation and extra work oracle sends the data to blockchain or a defi protocol like (hyperliquid,chromo,lanca)

But, we all know peter uncle said ‘ with great power comes great responsibility ‘

There are 2 types of oracle one is centralized and another is decentralized. Usually centralized oracle can be failed or temper with the data itself because that oracle is controled by one entity. And in blockchain a single point of failiure can cause a massive problem.

Decentralized oracles are controlled by hundreds if not thousand nodes operator that continuously checking up the price so not every node can fail. So a decentralized oracle is much safer option. (e.g. chainlink, pyth,band protocol etc)

Not only decentralization is the main power, one of the major concern about oracle is that Oracle exploit.

What is Oracle exploit?

Oracles are like messengers between the real world and blockchains. They deliver external data (like BTC prices, weather info, match results) to smart contracts. But if that data is wrong — whether by mistake, bad design, or manipulation it can seriously harm DeFi protocols. This is what we call an oracle exploit.