Bitcoin (BTC) Price and Market Data

Bitcoin is a settlement network with its own unit of account, also called bitcoin. There is no company behind it, no board, and no customer support line. Software rules are enforced by thousands of nodes that each independently validate every block; a change to those rules only takes effect if enough of that ecosystem chooses to run the new software. That is why upgrades to Bitcoin are rare, slow and conservative compared with almost every other network we cover.

The unit is divisible to eight decimal places. The smallest unit, one satoshi, is 0.00000001 BTC, which is why faucets and micro-earning sites quote payouts in satoshis rather than fractions of a coin. Total issuance is capped at 21 million BTC, and roughly 19.9 million of those already exist; the remainder is released gradually until issuance effectively ends in the 2140s.

Miners compete to find a hash below a target value. Whoever finds one first publishes a block, collects the block subsidy plus the fees attached to the transactions inside it, and the race restarts. The difficulty of that target adjusts every 2,016 blocks — roughly every two weeks — so that blocks keep arriving about every ten minutes regardless of how much mining hardware is switched on.

The block subsidy halves every 210,000 blocks, approximately every four years. Each halving cuts new issuance in half and shifts a little more of the miners' income toward transaction fees. This is the mechanism behind Bitcoin's fixed supply curve, and it is entirely predictable: anyone can calculate the issuance for any future block today.

Transactions do not clear instantly. They sit in the mempool — a backlog of unconfirmed transactions held by nodes — until a miner includes them. Because block space is limited, users effectively bid for it by attaching a fee measured in satoshis per virtual byte. When the backlog grows, the fee needed for quick confirmation rises; when it clears, cheap transactions confirm again. Our Bitcoin fees page tracks that backlog directly from mempool data.

• Confirmation is probabilistic: more blocks on top of yours means more work would be needed to reverse it.
• Fees depend on transaction size in bytes, not on the amount sent — sending $10 and $10 million can cost the same.
• Consolidating many small inputs costs more in fees than spending one large input.

In practice Bitcoin serves three distinguishable roles. The first is long-horizon saving in a supply-capped asset, which is what most retail holders and every corporate treasury allocation is really doing. The second is cross-border settlement of relatively large amounts, where a fixed fee of a few dollars beats correspondent banking on both cost and finality. The third is as the reserve collateral of the wider crypto market: BTC is the pair most assets trade against and the collateral most lending desks accept.

Small everyday payments are the weakest fit on the base layer, because a $3 coffee and a $30,000 transfer compete for the same block space. The Lightning Network exists to handle that case by moving small payments into payment channels that settle to the main chain only when opened or closed. For micro-earning sites, this is why many platforms pay out in Lightning or batch withdrawals: sending hundreds of tiny on-chain payments would cost more in fees than the payouts are worth.

Price volatility is the obvious one: drawdowns of 70% or more from a cycle peak have happened repeatedly, and nothing about the protocol prevents another. Bitcoin's supply cap is a monetary property, not a price floor.

Custody risk is the one that costs people the most money in practice. A self-custodied wallet with a lost seed phrase is unrecoverable, and an exchange balance is a claim on a company rather than coins you control. Both failure modes have destroyed real holdings, repeatedly and at scale.

There is a long-term security question worth understanding. Miner revenue is subsidy plus fees, and the subsidy halves toward zero. If fee revenue does not grow to replace it, the security budget shrinks. This is a live debate rather than a solved problem, and anyone claiming certainty in either direction is overstating what is known.

Finally, transactions are permanent and pseudonymous, not private. Every payment is public forever, and addresses can often be linked to identities through exchanges. Sending to a wrong address is irreversible; there is no chargeback and no support desk.

The Bitcoin whitepaper was published in October 2008 under the pseudonym Satoshi Nakamoto, and the first block was mined in January 2009. For its first two years the network had effectively no market price. The 2010–2013 period established exchange trading, the 2014 Mt. Gox collapse demonstrated custodial risk at scale, and the 2017 block-size dispute ended with the SegWit upgrade and the Bitcoin Cash fork.

Later milestones changed who holds it rather than how it works: the 2020–2021 entry of corporate treasuries and futures markets, the 2021 Taproot upgrade improving script flexibility and privacy, and the 2024 approval of US spot exchange-traded funds, which moved a large share of holdings into regulated custodians. The protocol itself has changed remarkably little across all of it — a feature, in the view of most of its users.