Betting with BTC: blocks, fees, address types and payouts

The two clocks behind a BTC withdrawal

A bitcoin withdrawal runs on two separate clocks. The first is the operator's: someone, or some system, approves the request within whatever window the terms allow. The second is the network's: once the operator broadcasts the transaction, it waits for a miner to include it in a block. Bitcoin betting sites differ on the first clock; the second is the same for all of them.

Bitcoin's own documentation is careful here. New blocks arrive roughly every ten minutes on average, but block discovery is probabilistic, so a single confirmation may come much sooner or much later than that. The same pages note that six confirmations are the usual minimum for high-value transfers. Operators decide for themselves how many confirmations they wait for before crediting a deposit, and the cashier usually states it.

Two practical consequences follow. Send a deposit well before the match you want to bet on, not in the last minutes before the market closes. And when a withdrawal has been approved but has not arrived, look the transaction up on a block explorer before contacting support: if it is in the mempool waiting for a block, the operator has already done its part.

What sets the fee: transaction size in vbytes

The fee for a Bitcoin transaction has nothing to do with the amount. Bitcoin.org puts it plainly: fees are relative to the number of bytes in the transaction, and fee levels vary with network usage. Sending 0.001 BTC can cost exactly as much as sending 1 BTC, and no cashier at any of the bitcoin betting sites can change that.

Size is counted in virtual bytes. Since SegWit, the network measures blocks in weight units, with a limit of 4,000,000 per block. Witness data (the signatures) counts as one weight unit per byte, and the rest of the transaction counts as four. One vbyte equals four weight units, which is why a SegWit transaction usually costs less than an older-style one of the same shape.

A worked example, with round numbers for illustration only: if your wallet suggests 8 satoshis per vbyte and your transaction is 150 vbytes, the fee is 1,200 satoshis. On a busy afternoon the suggested rate may be several times higher. Pay below the rate miners are currently prioritising and, as bitcoin.org warns, the first confirmation may take considerably longer.

What this means for a bettor:

1. Small deposits suffer most, because the fee is fixed by size, not by value.
2. A wallet that has received many small amounts will build larger transactions when it spends them, and pay more.
3. Fewer, larger deposits are cheaper per pound than many small ones.

Our step-by-step deposit guide covers the exchange side of this.

Address types: 1, 3, bc1q and bc1p

The deposit page at bitcoin betting sites will show you one of four kinds of Bitcoin address. Any of them works if your wallet can send to it.

The bc1p row is the one that occasionally causes trouble. BIP 350, which defines bech32m, notes that when it was written many wallets and services did not support sending to newer witness versions. If an exchange rejects a bc1p deposit address, do not alter the address; check what the exchange can send to, or use a different wallet as the middle step.

One more trap. Several cashiers in this comparison list both BTC and Bitcoin Cash (BCH) as separate coins. They are different networks. Pick the BTC line in the cashier, copy that address, and send BTC only. A Bitcoin transaction cannot be reversed by anyone except the person who received it, so a mistake here depends on the operator's goodwill. Our wallet guide for punters explains how to keep the coin and network straight.

Lightning: a payment layer, not a cashier feature we list

The Lightning Network sits on top of Bitcoin. Two parties open a payment channel with an on-chain transaction, then exchange payments off-chain, settling to the blockchain later. The project describes payment speeds measured in milliseconds to seconds and very low fees, because most payments never wait for a block.

For betting, the point is narrow. A Lightning payment needs a Lightning invoice from the receiver. A cashier that shows an address beginning 1, 3 or bc1 is asking for an ordinary on-chain transaction, and paying it from a Lightning balance would require a swap through a service that supports that. This page does not list any operator as accepting Lightning. If one of them adds it, the cashier will show an invoice rather than an address.

Reading a stake in BTC and mBTC

Bitcoin divides to eight decimal places. Most bet slips that price in bitcoin use either BTC or millibitcoin (mBTC), and wallets often show satoshis.

An example slip: a 6 mBTC stake at decimal odds of 2.40 returns 14.4 mBTC if it wins, which is 8.4 mBTC of profit. Odds work the same way whatever the unit. If you think in fractional or American prices, the odds converter translates them before you stake.

Price moves while the bet is open

The stake is in bitcoin, but your rent is not, and this is a risk that bitcoin betting sites leave entirely with the bettor. Bitcoin.org warns that the price can rise or fall unpredictably over short periods, and a bet that stays open over a weekend is exposed to that.

An example, using a price chosen for round numbers rather than any real market quote. On a Saturday morning one bitcoin is worth £60,000, and you stake 0.02 BTC (20 mBTC), which is £1,200. The bet wins at 2.00 and returns 0.04 BTC on Monday. If the price has dropped 10 per cent to £54,000 by the time you withdraw, those 0.04 BTC are worth £2,160 rather than £2,400. If it rose 10 per cent, they are worth £2,640. Had the bet lost, you would have lost 0.02 BTC whatever the price did.

Bettors who want the stake and the return to stay fixed in value often use a dollar-pegged coin instead; our stablecoin page compares that route. Others keep BTC but withdraw soon after settlement to shorten the exposure.

Document checks and caps measured in bitcoin

Some rules in operators' terms are written in bitcoin, others in fiat or stablecoins, and that changes how they behave.

• Rocketpot asks for documents on withdrawals above 0.05 BTC or $2,500 (clause 11.4), and allows 30 days to supply them.
• Vave may ask for documents before any withdrawal at its discretion, with 14 days to provide them (clause 8.7).
• Wild.io caps withdrawals at $100,000 per week (clause 9.6).

A threshold of 0.05 BTC is 50 mBTC, and its value in pounds moves with the price. A weekly cap set in dollars works the other way: the number of bitcoins you can take out in a week shrinks when the price rises. On a big win, check both before you plan the withdrawal.

Before you send BTC to a sportsbook

1. Confirm the cashier line says BTC, not BCH or a wrapped token.
2. Check the address prefix and that your wallet or exchange can send to it.
3. Look at the fee rate your wallet suggests, and avoid tiny deposits on busy days.
4. Note the operator's payout window and any document trigger from its terms.
5. Decide in advance how long you are willing to hold bitcoin after a bet settles.

The coins hub covers the other coins, and our responsible gambling page lists support if betting stops being fun. Of all the bitcoin betting sites compared here, the one that suits you is usually decided by the payout window and the document trigger, not by the coin itself.

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