Bitcoin Simulator

← Back to Philosophy
Chapter 9 · Wallets · The Live N Slow Bitcoin Curriculum

Send Bitcoin.
Risk nothing. Learn everything.

A live wallet simulator. Watch UTXOs get created and destroyed in real time. Feel what it means to broadcast a transaction to the network. No real Bitcoin involved.

✓ UTXOs ✓ Mempool ✓ Confirmations ✓ Fees ✓ Change outputs Keys → Lightning →
A
Alice
Your wallet
1.50000000 BTC
150,000,000 SATS
Receiving address
bc1qalice9x2mf4k3p8v7n2jq5r0sd6yt8uw3h...
UTXOs — unspent outputs
B
Bob
Recipient
0.25000000 BTC
25,000,000 SATS
Receiving address
bc1qbob7f2xt9pq4mn8k1vz6w3ry5sd2ue4...
UTXOs — unspent outputs
Broadcast a transaction
Fee priority
Mempool — the waiting room
No pending transactions. Broadcast one above ↑
Node log — what your Start9 sees
What just happened? The concepts, live.
⛓
UTXO consumed
Your old unspent output was destroyed. New UTXOs were created for the recipient and your change. Like handing over a bill and receiving change.
🔑
Private key signed it
Your private key proved ownership without ever leaving your wallet. The network verified the signature using your public key only.
⏳
Mempool broadcast
Your transaction was sent to thousands of nodes simultaneously — including your Start9. All are watching and validating it.
⛏
Miner selected it
A miner chose your transaction based on fee rate, bundled it with others into a block, and solved the proof-of-work puzzle.
↩
Change returned
Leftover BTC came back to you as a brand new UTXO at a fresh address. Your wallet tracks it automatically. Privacy by default.
∞
Confirmed forever
Locked in the chain. Immutable. Irreversible. No bank. No chargeback. No board meeting required. Just math.