> ## Documentation Index
> Fetch the complete documentation index at: https://docs.noxpay.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Bitcoin (BTC)

> The original decentralised digital currency, supported on Bitcoin Mainnet in Noxpay.

Bitcoin (BTC) is the first and largest cryptocurrency by market capitalisation. It was introduced in 2009 by the pseudonymous Satoshi Nakamoto as a peer-to-peer electronic cash system that operates without a central authority.

Unlike stablecoins such as USDT or USDC, Bitcoin's value is not pegged to any fiat currency — it is determined entirely by market supply and demand. Bitcoin has a hard supply cap of 21 million coins, making it a deflationary asset by design.

## Bitcoin on Noxpay

Noxpay supports Bitcoin on Mainnet:

| Currency code | Network         | Notes                                                                       |
| ------------- | --------------- | --------------------------------------------------------------------------- |
| `BTC`         | Bitcoin Mainnet | Native BTC. Uses Bech32 (`bc1...`) and legacy (`1...` or `3...`) addresses. |

## Address formats

Bitcoin supports several address formats:

* **Legacy (P2PKH):** starts with `1` — the original format, supported everywhere.
* **Script (P2SH):** starts with `3` — used for multisig and SegWit-wrapped addresses.
* **Native SegWit (Bech32):** starts with `bc1q` — lower fees, not supported by all older wallets.
* **Taproot (Bech32m):** starts with `bc1p` — newest format, highest efficiency.

Noxpay supports all standard Bitcoin address formats. When in doubt, confirm with your recipient which format their wallet accepts.

## Network uniqueness

Unlike EVM-compatible tokens, Bitcoin has a single mainnet. There is no cross-network ambiguity: a BTC withdrawal goes to Bitcoin Mainnet, and the address format is distinct from any other supported currency. There is no risk of sending to the wrong chain.

## About Bitcoin

Bitcoin is an open-source, decentralised network maintained by a global set of node operators and miners. No single entity controls the Bitcoin protocol.

<Card title="bitcoin.org" href="http://bitcoin.org/" icon="arrow-up-right-from-square">
  Learn more about Bitcoin at bitcoin.org
</Card>