The first cryptocurrency, launched in 2009. Computers around the world keep its transaction ledger together, with no central authority.

How many bitcoins are there?

The supply is capped at 21 million. No more can ever be created, which is why it's called 'digital gold'.

Where can I buy Bitcoin?

On most cryptocurrency exchanges. In Korea, KRW exchanges such as Upbit, Bithumb, and Coinone list it. (Information only — not a recommendation to use any specific exchange or to invest.)

₿ No.001

📒 Codex 3 entries · Mcap #1 · Major

Bitcoin BTC

often called ‘digital gold’

⚡ L1🛡️ PoW💸 Payment

Price mock

$68,420

ALTROOKIE CODEX

💬 TL;DR

The very first cryptocurrency, launched in 2009.
It runs without governments or banks — computers worldwide keep the ledger together.
Its supply is capped at 21 million, which is why it's called ‘digital gold’.

📊 Stats

👑Awareness Mcap #1

🌐Availability 142 exchanges · 🇰🇷 listed

🎢Volatility High (±15%/mo)

🪨Age Since 2009 (16y)

💎Scarcity Cap 21M · 94% issued

🧩 How it works

Bitcoin works without any central authority. When someone sends a payment, computers around the world (miners) verify it, bundle verified transactions into a block, and record it permanently on the chain. Once recorded, no one can change it.

💸 A transaction is ⛏️ verified by computers worldwide, bundled into a 📦 block, and recorded permanently on the ⛓️ chain.

⚖️ Strengths & Weaknesses

⚔️ Strengths

The most battle-tested network (16 years, no downtime)
Fixed supply of 21 million (no inflation)
Most widely listed and traded coin in the world

🛡️ Weaknesses

Relatively slow transactions (~7 TPS)
High price volatility
Mining uses a lot of electricity

🇰🇷 Korea Market

🏦 Upbit🏦 Bithumb🏦 Coinone

Listed on all major Korean won (KRW) exchanges.

🔧 Tech Specs

ConsensusProof of Work (PoW)

Throughput~7 TPS

Block time~10 minutes

📜 Story

2009Bitcoin network launches (first block)
2017First major bull run; goes mainstream
2024Spot ETF approved in the US

🧬 Evolution Line

₿ Bitcointhis ⑂ forked here

Ł Litecoin2011 · code-based fork Ƀ Bitcoin Cash2017 · hard fork

🤝 Related Coins

Ξ Ethereum Ł Litecoin

📖 Related Terms

👛 Wallet 🔑 Seed Phrase ⚖️ Coin vs Token

❓ FAQ

What is Bitcoin?: The first cryptocurrency, launched in 2009. Computers around the world keep its transaction ledger together, with no central authority.
How many bitcoins are there?: The supply is capped at 21 million. No more can ever be created, which is why it's called 'digital gold'.
Where can I buy Bitcoin?: On most cryptocurrency exchanges. In Korea, KRW exchanges such as Upbit, Bithumb, and Coinone list it. (Information only — not a recommendation to use any specific exchange or to invest.)

⚠️ Not investment advice. All figures are for information only (MOCK (placeholder figures, pre-CoinGecko) · 2026-05-30).