Bitcoin scarcity versus gold: supply growth, stock and verifiability

Bitcoin's supply grows through the block subsidy, and the rate is fixed in advance. Each block creates new coins according to a schedule that halves every 210,000 blocks, and the schedule is enforced by every node independently. A block that claims more than the current subsidy is invalid and is rejected, no matter how much work went into producing it. There is no mechanism by which the issuance rate can respond to price, to demand, or to any decision by any person.

The supply is also bounded. The subsidy halves until it rounds to zero in whole satoshis, and the sum of all subsidies converges on twenty-one million coins. The convergence is a property of the geometric series, not a target that is aimed at, and the final coins are not issued until well into the next century. The supply schedule page sets out the epoch-by-epoch arithmetic.

The current annual issuance rate is a small fraction of one percent of the existing supply, and it falls with each halving. That is a lower growth rate than gold's, and unlike gold's it is not an estimate: it is a number that can be read off the protocol and verified by anyone running a node. The difference in verifiability is the sharpest contrast between the two assets.

The comparison holds on supply growth. Both assets have a stock that dwarfs annual production, and both therefore have a supply that grows slowly relative to what already exists. On that measure Bitcoin is the more extreme of the two, and the gap widens over time as the subsidy halves. A reader interested in the ratio itself will find it treated on the stock-to-flow page.

The comparison breaks down on verifiability. Anyone can run a Bitcoin node and check the total supply, the issuance in any block, and the schedule that governs the future. Gold's supply cannot be verified that way. The above-ground stock is an estimate assembled from production records, and no observer can audit it directly. A holder of gold cannot prove how much gold exists; a holder of bitcoin can check the ledger.

The comparison also breaks down on the source of scarcity. Gold is scarce because it is difficult and expensive to extract, and because the easy deposits have largely been found. That is a physical and economic constraint, and it could in principle change: a new extraction technology, or an asteroid, would alter it. Bitcoin is scarce because the rules say so, and the rules are enforced by the network. Its scarcity is a social and technical fact rather than a physical one, and it depends on the network continuing to enforce the rule.

There is a further asymmetry worth stating. Gold has industrial and decorative uses that generate non-monetary demand; bitcoin does not. Gold's price therefore rests partly on its use in electronics, dentistry and jewellery, and partly on its role as a store of value. Bitcoin's price rests entirely on the second kind of demand. That makes the two assets behave differently even when their supply profiles look similar.