The girls were enjoying a beautiful afternoon in a green valley.
A waterfall rushed down between the mountains, wildflowers covered the ground, and birds were singing from the trees.
They walked along the stream, laughing and talking.
Then Maryam suddenly stopped.
She looked at her friends and asked:
“Wait… if a blockchain can verify everything that happens on it, how does it know what the price of gold is outside the blockchain?”
The girls froze.
😳
Maryam stared at them.
Then she gently slapped her forehead with her palm.
“Why didn’t I think of that before?”
No one laughed.
The conversation had completely stopped.
For a few seconds, the only sounds were the waterfall and the birds.
One of the girls finally whispered:
“That’s strange… I never thought about it.”
Maryam sat on a rock.
“A blockchain can verify transactions and information inside its own network. But it can't simply look outside and see what is happening in the real world.”
“So how would a smart contract know the price of gold?”
Maryam smiled.
“That’s where things get interesting.”
“An Oracle?”
“Exactly.”
The girls leaned closer.
“An Oracle acts as a bridge between the blockchain and information from the outside world.”
“Like what?”
“The price of gold. The price of Bitcoin. Exchange rates. Weather data. Even the result of a real-world event.”
“So the Oracle brings that information to the blockchain?”
“Yes. Then a smart contract can use that information to make a decision or execute an action.”
One of the girls looked toward the mountains.
“So the blockchain can be very good at verifying what happens inside its own world…”
“…but it still needs a way to know what is happening outside.”
Maryam nodded.
“And that small detail is incredibly important.”
The girls looked at each other.
Suddenly, the question that had silenced the valley made perfect sense.
The waterfall continued to flow.
The birds returned to their song.
And the girls continued their walk.
But now they understood something they hadn't noticed before:
A blockchain may be able to verify its own world extremely well.
But it cannot naturally see ours.
That connection is one of the key roles of an Oracle.
And sometimes, one unexpected question is enough to change the way you see an entire technology.