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The whitepaper, 'Bitcoin: A Peer-to-Peer Electronic Cash System,' was published by Satoshi Nakamoto on 31 October 2008. It showed how to prevent double-spending without a central authority and became the origin of Bitcoin.
A hardware wallet keeps private keys on a dedicated offline device and signs transactions without exposing the key, resisting hacking. It suits larger, long-term holdings, and safeguarding the seed phrase matters more than the device itself.
Most Bitcoin scams share a pattern: 'guaranteed profits' plus pressure to 'send now.' Know the classic schemes — fake yields, impersonation, fake exchanges, fake support, romance scams — watch the red flags, and report to local authorities before sending.
A hot wallet is always online (convenient, more exposed); a cold wallet is offline (safer, more effort). It's a convenience-vs-security trade-off — keep small spending amounts in hot and the bulk in cold.
Taproot is a major Bitcoin upgrade activated on 14 November 2021. By introducing Schnorr signatures, it improved transaction efficiency, privacy, and smart-contract flexibility, delivered as a backward-compatible soft fork.
Bitcoin's supply is capped at about 21 million, fixed in code. The halving steadily slows issuance; the last fraction is expected around 2140, after which miners earn from fees rather than new issuance.
Bitcoin's value comes from scarcity (the 21M cap), tamper-resistance, the convenience of sending and storing it, and social agreement. It has no state or gold backing — but neither, fundamentally, does fiat money.
Bitcoin is called 'digital gold' for its scarcity and ease of transfer, but it lacks gold's long history and stability, and its price is far more volatile. They are different assets with different properties.
Sending bitcoin is irreversible: paste and visually verify the address, and do a test send for new or large transfers. Fees move with congestion (sat/vB); confirmation usually takes tens of minutes. Lightning suits small payments.
Satoshi Nakamoto is the pseudonym of Bitcoin's creator, whose real identity is unknown — possibly a person or a group. Satoshi published the 2008 paper, mined the genesis block in 2009, and disappeared around 2010.
The Lightning Network is Bitcoin's layer-2 payment system. Payment channels let you send small amounts almost instantly and for tiny fees — great for everyday spending, less so for large or long-term holdings.
Bitcoin works through three pillars: a blockchain that records transactions, mining (Proof of Work) that adds and secures blocks roughly every 10 minutes, and a fixed 21M supply enforced by the halving.
Bitcoin's history: the 2008 whitepaper, the 3 Jan 2009 genesis block, 2010 pizza day, the 2014 Mt. Gox collapse, the 2017 SegWit/BCH fork, 2021 Taproot and El Salvador, and 2024's US ETFs and halving.
Bitcoin mining adds blocks and secures the network via Proof of Work. Miners compete roughly every 10 minutes; the winner earns the block reward (3.125 BTC subsidy plus fees). Difficulty auto-adjusts.
The safest way to hold bitcoin is self-custody: control your own private keys. Use a hot wallet for small spending and a cold/hardware wallet for savings, and back up your seed phrase offline.
The Bitcoin halving cuts the block reward in half every 210,000 blocks (~4 years). It happened in 2012, 2016, 2020 and April 2024 (now 3.125 BTC); the next is ~2028 and is block-height based.
To buy Bitcoin in Japan, use an FSA-registered exchange, complete KYC with a residence or My Number card, deposit yen, and buy from a few hundred yen. Profits are generally taxed as miscellaneous income.
Buy Bitcoin in six steps: open an account at a regulated exchange, verify identity, deposit, buy, move to safe storage, and check tax. Start small and prioritize self-custody.
Bitcoin is a decentralized digital currency capped at 21 million coins, secured by a blockchain and mining (Proof of Work), with new issuance halving roughly every four years.
