What is a crypto wallet?

A tool that holds private keys and signs transactions. The funds themselves are recorded on the blockchain, not inside the wallet. The wallet proves ownership to the ledger. Lose the wallet and the ledger still shows the balance, recoverable from the backup phrase. This is the manufacturer-documented model.

Is Bitcoin a stablecoin?

No. Bitcoin is the native asset of its own blockchain, with a floating price and a 21 million unit cap. Stablecoins are tokens issued on blockchains, engineered to hold a fixed value against ordinary money. Both are cryptocurrencies. Only one is designed to hold a dollar price.

What is USDT on Tron / TRC20?

The same dollar stablecoin living on a different blockchain. USDT is issued on multiple networks, and TRC20 is the token standard used on Tron. The ledger differs, the issuer and the one-dollar target do not. This site's Tron page covers that network's specifics with dates.

What is wrapped USDC (USDC.e) and how do I unwrap it?

A ledger entry on one chain representing an asset locked on another. Bridged USDC.e is not the issuer's native token on its destination chain, it is a wrapper backed by the original. Unwrapping runs through the bridge that created it. The chains pages on this site cover the native-versus-bridged distinction.

What is a stablecoin?

A token on a blockchain engineered to hold a fixed value, usually one dollar, backed by reserves the issuer has attested. The blockchain supplies the transfer and ownership machinery. The stability comes from the reserves and the issuer, not from the ledger itself.

The Blockchain: A Public Ledger, Explained

What this page is

This page explains the blockchain, the data structure under every asset this site covers. It was rebuilt in 2026 from a stub that held three video links and a pointer sentence. The rebuild states the mechanics from primary documentation. It defines the terms and links each neighbor to its own page.

The ledger, in one paragraph

There are no physical bitcoins, only balances kept on a public ledger that everyone has transparent access to. The project’s own transparency statement puts it plainly. All information concerning the money supply itself is readily available on the blockchain for anybody to verify ^[2]. That sentence is the definition of the technology. A blockchain is a ledger that its own users maintain in public, coin by coin and block by block.

The same model generalizes. Every cryptocurrency this site covers records balances on some public ledger. Tokens such as stablecoins are entries on those ledgers. Issuers issue and redeem them. The ledger machinery transfers them, the same as any token.

How blocks get added

Blocks are added by mining. Mining is a distributed consensus system, used to confirm pending transactions by including them in the blockchain ^[1]. No central operator approves entries. The consensus process does. Its rules are open for anyone to read.

Confirmation takes time. Transactions usually receive their first confirmation within about 10 to 60 minutes, per the project’s documentation ^[1]. That delay is a property of the consensus design, not a service outage. Faster settlement exists, and it is built as a layer above the ledger, which is the next section’s subject.

What lives on the ledger

Supply lives there. The circulating supply of bitcoin, 20,083,115 BTC on 12 September 2026, can be read straight from an on-chain query ^[3]. No issuer announcement is needed, because there is no issuer. The ledger is the record.

The transparency is a stated design goal, not a side effect. The project lists transparency and neutrality among its properties, and its phrasing is worth keeping. All information concerning the money supply itself is readily available on the blockchain for anybody to verify ^[2]. Anybody means anybody. The verification path is open to the public, with no permission gate and no privileged viewer.

Ownership lives there too, the counterintuitive part. A wallet does not hold coins. A wallet holds keys. The balances those keys control are entries on the ledger. The keys prove ownership to the network. The network never holds the keys for you. Custody is therefore its own discipline, separate from the ledger, and this site’s wallet pages cover it.

That split also explains what recovery means here. A lost wallet application is an inconvenience, because the keys can be restored from their backup phrase onto new software. A lost key with no backup is final.

The ledger keeps listing the balance under an address nobody can sign for. The seed phrase safety page covers that discipline in full. The cold versus hot page covers the custody choice.

Layers above the ledger

The ledger is not the only place crypto activity happens. The Lightning Network runs payment channels between parties. Its specification states that only the opening and closing transactions of a channel are recorded on the blockchain ^[4]. The channel is a running tab between two parties. The ledger sees the open, later the close, and none of the payments between.

That shape repeats across the industry. Faster systems settle in batches or channels. They write a summary entry back to the blockchain. The Lightning page covers that network in full. The general lesson belongs here. The blockchain is the settlement layer, and things built on it inherit their security from it.

One chain, many chains

Bitcoin runs one blockchain. Other assets run their own, with their own consensus rules and their own native fees. The chains hub covers the major networks this site documents, each with its own dated fee and finality facts. A token can exist on several chains at once, native from its issuer or bridged from a wrapper. The native-versus-bridged distinction matters for stablecoins especially. The token pages state which form they describe.

How this page was checked

The mechanics above trace to three primary sources, each read in September 2026. The bitcoin project’s own documentation supplies the ledger, consensus, and confirmation facts ^[1] ^[2]. The Lightning specification supplies the channel statement ^[4]. An on-chain supply query supplies the circulation figure ^[3].

The page’s own history deserves a line. Before this rebuild, the page held a title, three video links, and a pointer sentence. The pointer told readers to see the blockchain section for more. That version defined nothing. This one defines its terms, dates its figures, and cites its sources. That is the difference between a signpost and a page.

Where this page sits

The cryptocurrency introduction defines the asset class. The cryptocurrency hub frames the basics cluster. The Lightning page and the chains hub carry the layers above and the networks beside. Every figure above carries its date.