Now we go inside the system.
When you press “Send”, what really happens?
We break it into simple steps.
Step 1️⃣ — You Have a Wallet
A wallet does NOT store Bitcoin physically.
It stores:
Your private key (secret password)
Your public address (like account number)
Think:
Public address = Email address (you can share it)
Private key = Email password (never share)
Bitcoin itself lives on the blockchain, not inside your phone.
Step 2️⃣ — You Click “Send”
Example:
You send 0.1 BTC to a friend.
Your wallet:
Creates a transaction message
Signs it using your private key
Broadcasts it to the network
This signature proves: “You are the real owner.”
Step 3️⃣ — Network Verification
Thousands of computers (called nodes) check:
Do you actually have 0.1 BTC?
Is your signature valid?
Are you trying to spend the same coin twice?
If valid → it goes to the waiting area (mempool).
Step 4️⃣ — Miners Confirm It
Miners:
Collect transactions
Solve complex math puzzles
Add transactions into a block
When the block is added to the blockchain:
✅ Your transaction is confirmed
✅ It becomes permanent
Step 5️⃣ — Confirmations
Each new block added after yours = more security.
1 confirmation = included in blockchain
6 confirmations = very secure
Why Double Spending Is Almost Impossible
Because:
Network checks ownership
Blockchain records history permanently
Changing past data requires controlling 51% of the network
Extremely expensive and unrealistic.
Important Distinction
Wallet → Signs transaction
Nodes → Verify
Miners → Confirm and secure
Answer the following Questions in Comments
Does Bitcoin live inside your wallet?
What is the role of a private key?
Who verifies transactions before they are added to blockchain?
What is a confirmation?