UNDER THE HOOD
Anatomy of a Transaction: What Happens Between the Click and the Confirmation
You hit "confirm" and then stare at a spinner for ten seconds. We break down what happens in those seconds, why you pay a fee, and what every field in the transaction details actually means.
Between clicking "confirm" and seeing "done," a few seconds pass in which a surprising amount happens. Once you know what, two things that annoy people most stop being a mystery: why it sometimes takes a while, and why you pay a fee even for a failed transaction.
A Transaction Is a Signed Command, Not a Transfer of Money
You're not moving coins around like files. You create an instruction — "send this much from address A to address B" — and sign it with your private key. The key itself never leaves your device; the signature is mathematical proof that the command came from whoever holds it. The network verifies it and updates the state.
That's exactly why signing is such a sensitive act. You're signing the content, not the intent. If a scam site slips you a command that reads "allow me to manage all of your USDC" and you click through it, the network will dutifully carry out exactly what you signed.
Walk the Path Yourself
Set a fee and send the transaction. You'll see where it waits and why the fee is worth paying:
- Signature Your wallet signs the instruction with your private key. The key never leaves your device.
- Mempool The transaction waits in the queue of unprocessed ones. This is where the fee decides the order.
- In a Block A validator included it in a block. From this moment it's in the chain.
- Confirmed More blocks pile up on top of it. The more there are, the harder it is to move the history.
The Fee: Who Gets It and For What
Every operation on the network costs computational work, measured in units called gasA unit of computational cost. A plain transfer costs 21,000 gas, a complex trade through a contract can easily cost ten times that.. How much gas an operation consumes is fixed. How much you pay per unit is an auction — and when the network is busy, whoever bids more wins.
Which gives us the unpleasant rule: you pay the fee for the work done, not for success. If a transaction fails halfway through, the work already happened and the network charges you for it anyway. That's why it's worth sending a small test amount first with any new contract.
Take It Apart, Piece by Piece
Open a transaction in a block explorer and a table of fields spills out at you. Click any of them and we'll tell you what it means:
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The address the transaction is sent from — derived from your public key. Nobody can use it on your behalf without the private key.
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Where it's going. Either a person's address or a smart contract — say, Polymarket's exchange contract itself. Always check the whole thing, not just the first four characters.
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How much native currency you're sending. For a token trade this is usually zero — the actual USDC moves inside the contract itself.
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The sequence number of your transaction from this address. It stops someone from replaying an old signed transaction — and determines the order in which they're processed.
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The cap on computational work you're allowing. If it runs out first, the transaction fails — and the fee is charged anyway, because the work already happened.
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The highest price per unit of work you're willing to pay. When the network is quiet, you pay less than this cap.
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The actual instruction for the contract. This is where what the transaction really does is hiding — and also what a scam site slips you to sign.
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The fingerprint of the whole transaction. It works as its identifier — you use it to find the transaction in a block explorer and show it to anyone.
When a Transaction Gets Stuck
Sometimes a transaction just hangs in the mempool and nothing happens —
you offered too little and the queue keeps skipping it. The fix is in
the nonce field: you send a new transaction with
the same nonce, but a higher fee. The network only processes one
of them, and the old one quietly falls away. In a wallet this is called
"speed up" or "cancel," and that's exactly what it does.
A consequence of the same rule: transactions from one address are processed in nonce order. If the one numbered 42 is stuck, number 43 can't go through, no matter how much it's willing to pay.
How Many Confirmations Are Enough
Once a transaction is in a block, it's technically gone through. But shortly after it's included, the network can still reshuffle the last few blocks (reorgA situation where the network settles between two competing ends of the chain proposed at nearly the same time, and discards one of them. It only affects the last few blocks — deep history is never touched.), so you wait for more blocks to build on top of it. Small amounts only need a handful of confirmations; large ones wait for finality — the point at which reversing it would cost an attacker more than they'd gain.
What matters for us is that this whole process is public at every stage. We see a shark's transaction the moment it lands in the mempool — that is, before it's even in a block. That's where the head start PolyTips runs on comes from.
What to Take Away
- A transaction is a signed command. You're signing content, not intent — read what you're clicking through.
- You pay the fee for the work, even when the transaction fails. Test with a small amount.
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noncedetermines the order. Beat a stuck transaction with a new one using the same nonce and a higher fee. - In a block = it happened. Confirmations on top of it = it's not moving now.
- "Approve" is the quietest and most dangerous transaction you'll ever sign.
That covers the basics: the market, the wallet, the chain, and the transaction. The rest is patience — and watching where the big money flows.