slide 13 · fundamentals
BTC & ETH transfers
Send simulated coins: BTC spends on .space, ETH updates an account on Etherscan.
- 1Pick BTC or ETH and set a fee
- 2Send and follow each stage
- 3Watch confirmations pile up
send coins to another player
waiting for another player to join this room… open this page in a second tab or share the link with the class.
- no transfers yet — be the first to pay a classmate.
Your wallet
What happens in the background
Drag the amount, fee and congestion sliders — the fee, ETA, queue position and the travelling coin all react instantly, even mid-flight. Each stage stage opens an explainer — click any completed stage to read it again.
Each block buried on top forces an attacker to redo that proof of work and outpace the honest chain. Six deep is the merchant standard.
- watching the queue… bids move every couple of seconds.
Nothing is queued in order of arrival: miners sort by sat/vB, so a later, richer transaction overtakes yours. Replace-by-fee re-signs the same inputs with a higher fee — nodes forget the old version, and only one of the two can ever confirm.
Every node holds a full copy of the ledger. Broadcast a transfer to watch it spread.
Tap any block to edit it. Each block stores the previous block's hash, so a single change cascades.