Historical value of a Bitcoin address
To estimate a Bitcoin address's historical market value, the report combines its Bitcoin activity with market prices from the relevant dates. The result describes an estimated value at those prices. It does not show what a particular person paid, received, or earned.
A simple example
Suppose 0.01 BTC is valued at $50,000 per BTC on its confirmation date. Its estimated value is $500. If the same amount is valued at $80,000 per BTC today, it is worth $800 at that price. The $300 difference is a change in valuation. It does not prove a $300 profit: the receipt could have been a transfer between someone’s own addresses, a gift, or another type of payment. These are illustrative prices, not a live quote.
How the report uses prices
Historical transaction values use daily market price data associated with the confirmation date, with currency conversion where available. If no price is available for a date, the report may use the previous available daily close. These figures are estimates, not exact execution prices or prices paid by the address owner.
Estimated value change is a separate calculation
The address report’s Value change view uses an average cost model. Historical market values of inflows build an estimated baseline. An outflow removes a proportional part of that baseline. The model compares that portion with the outflow’s historical value. It also compares the remaining modeled BTC with its current market value.
A worked example of value change
These prices are illustrative. Receive 0.1 BTC when bitcoin trades at $40,000, a value of $4,000. Receive another 0.1 BTC at $60,000, a value of $6,000. The baseline is now $10,000 for 0.2 BTC, an average of $50,000 per BTC.
Then send 0.05 BTC when bitcoin trades at $80,000. Its value then is $4,000. Its share of the baseline is $2,500 (0.05 BTC at $50,000), so the estimated value change on that outflow is $1,500. The remaining 0.15 BTC carries a baseline of $7,500 and is worth $12,000 at $80,000.
Where to find it in a report
Open an address report and choose History. Each transaction opens to show its value then and the BTC price then, next to the amount and fee. The Value tab adds them up: value when received, value change on outflows, and value change on the BTC that remains.
Common questions
Which currencies can I use?
USD, EUR, JPY, CAD, AUD and PLN. Choose the currency at the top of the page; historical values convert with the rates for each date where they are available.
Why does a transaction show N/A?
A transaction still in the mempool has no confirmation date yet, and a date without price data has no estimate. N/A means unavailable, not zero.
Why is the value change marked partial?
It needs the address's whole history. Without Watch+, value history covers addresses with up to 1,000 transactions; a longer history, or missing prices for some dates, makes the estimate partial.
Can I use these numbers for taxes?
They are market estimates for an address, not records of what you paid or received. Tax rules depend on your own records and where you live.
Other comparisons can use different methods, such as periods adjusted for flows. Read the method shown beside each measure. A model cannot determine whether a Bitcoin transfer was a purchase, a sale, a gift, or a movement between someone’s own addresses.
When an estimate is limited
Missing transaction history or historical prices can make an estimate partial or unavailable. Some calculations or downloads require additional access, and very large histories may remain unsupported. The report should tell you which limitation applies. Missing data is not a zero value.
What these numbers do not establish
They do not establish an owner’s actual acquisition cost, investment profit, sale proceeds, or taxable gains. Use them to understand changes in market value and Bitcoin activity within the stated scope.