More than 95 percent of Bitcoin's total issuance cap of 21 million coins has already been mined. About 20.1 million coins have been supplied to the market, and the next halving is scheduled for around April 2028. As new issuance is again set to be cut in half, interest is growing in Bitcoin's supply structure and related tools.

Blockchain media outlet Cryptopolitan reported on Monday that Bitcoin's total issuance is limited to 21 million coins and about 20.1 million have been mined so far. Bitcoin has a halving structure in which mining rewards are cut in half every time 210,000 blocks are created.

The current block reward is 3.125 BTC, with about 450 BTC newly issued each day. When the fifth halving takes place around April 2028, the block reward will fall to 1.5625 BTC and daily new issuance is expected to drop to about 225 BTC. The amount of Bitcoin already issued does not decline; the reduction comes through a decrease in newly supplied coins.

Beyond halvings, Bitcoin's ecosystem still has milestones to watch. The 1,000,000th block is expected to be reached around April 2027, and halvings will continue after that. The final tiny fraction of Bitcoin is expected to be mined around 2140.

A service that allows users to check this supply schedule and Bitcoin data in one place was also introduced. OpenBitcoin, a Bitcoin-focused explorer and information site, provides various functions including a countdown showing the time remaining to the halving and the 1,000,000th block, as well as searches for addresses, transactions and blocks, fee tracking, exchange-rate conversion and a mining calculator.

Users can enter a Bitcoin address, transaction ID or block number in a search box to view related information without creating an account or installing a program. It can convert Bitcoin and satoshis into 15 currencies. It also supports daily price records since 2010, a tool to check historical purchase prices and a function to calculate the performance of regular purchases.

Its transaction-fee functions show current transfer costs, relatively low fee levels and estimated transaction size. Users can use it as a reference for deciding timing and cost when on-chain fees rise due to network congestion. It also provides tools including address verification, QR code generation, decoding transactions and Lightning invoices, verifying signed messages, checking seed phrases and an offline two-factor authentication device.

Its educational content focuses on risks that can arise during the storage and transfer of Bitcoin. OpenBitcoin runs 19 guides covering seed-phrase backups, self-custody, scam methods, address poisoning, the Lightning Network, UTXO, privacy and inheritance planning. It also provides tax materials, early Bitcoin history, an exchange-hacking timeline, node statistics, a fear and greed index and materials related to quantum computing.

OpenBitcoin's operations team said it gathered related functions in one place to reduce the inconvenience of having to separately search for a Bitcoin explorer and explanatory content. It aims to provide a service that allows users to check an address, review prices in their local currency and understand the meaning of the halving.

On data sources, it said all figures come from its own full node and that its data layer has been released as open source. It also stressed that it is an independent Bitcoin data and education site that does not provide transaction brokerage, asset custody or investment advice.