Bitcoin is a decentralized digital currency with a fixed supply of 21 million coins. Created in 2009 by Satoshi Nakamoto, it allows value to be transferred over the internet without a trusted third party like a bank. No government, company, or individual controls it.

How does Bitcoin work?

Bitcoin runs on a public ledger called the blockchain, maintained by thousands of computers worldwide. Transactions are verified by a network of nodes and recorded permanently. The supply is hard-capped at 21 million coins enforced by code, not by any authority.

Is Bitcoin a good investment?

Bitcoin has a fixed supply, low correlation with traditional assets, and growing institutional adoption. It is also highly volatile and has experienced multiple 70-80% drawdowns. Whether it belongs in your portfolio depends on your situation, risk tolerance, and time horizon.

Bitcoin Path Quiz — Guide

What Is a Seed Phrase?

A seed phrase is a list of 12 or 24 ordinary-looking words.

It's also the master backup for your entire Bitcoin wallet — and the single most important piece of information in self-custody.

If you have it, your Bitcoin is recoverable anywhere.

If someone else has it, your Bitcoin is theirs.

Getting comfortable with this idea is a turning point on most Bitcoin paths.

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When a Bitcoin wallet is created, it generates a large random number and uses it to derive every private key the wallet will ever use. The seed phrase is simply a human-readable version of that starting point — 12 or 24 words from a standard list, presented in a specific order. From those words, the wallet (or any compatible wallet) can regenerate every key and recover every address and balance associated with it.

That makes the seed phrase simultaneously your most powerful asset and your biggest point of risk. If your phone is lost, stolen, or destroyed, your seed phrase lets you restore your entire wallet on a new device in minutes — your bitcoin was never "on" the phone in the first place, just accessible through it. But if someone else obtains those same words, they can move every bitcoin in the wallet, instantly and irreversibly, with no way to reverse it.

This is why the standard advice is so consistent: write your seed phrase down on paper (or a more durable material), store it somewhere private and secure, and never digitize it. Never photograph it, never type it into a website or app outside of an actual wallet recovery, and never share it with "customer support" — legitimate wallet companies will never ask for it after initial setup. Scams built around fake "support" asking for seed phrases are extremely common.

Why does this matter so much? Because Bitcoin has no account recovery system. There's no password reset, no customer service line that can restore access, no institution that can override the math. The blockchain will permanently show your balance — but without the keys derived from your seed phrase, that balance is permanently out of reach. Most people who lose bitcoin in self-custody don't lose it to hackers; they lose it because they never properly backed up — or safely stored — their seed phrase in the first place.

Not financial advice — just a clear framework to help you think through your options. · Browse all Bitcoin resources →

210 Questions About Bitcoin — book cover

This is one of 210 questions answered in the book 210 Questions About Bitcoin.

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