Series

Why the fee market gets crowded, how to confirm arrival, how RBF and CPFP move a transaction again, and how to broadcast one yourself.

1. Why Bitcoin Fees Suddenly Spike Out of Nowhere
2. Checking for Yourself That Bitcoin Actually Arrived
3. I Sent Bitcoin and It Never Arrived

From seed phrases and HD wallets to hardware wallets, PSBTs, descriptors, message signing and inheritance.

1. Twelve Words That Hold Every Bitcoin You Own
2. Lose These 12 Words and Your Bitcoin Is Gone Forever
3. Online Wallet or Locked Vault, Pick the Right One for Your Bitcoin

Public-key cryptography and addresses, Script, block structure, Merkle trees, Schnorr signatures, timelocks, covenants and how the rules change.

1. What Actually Makes a Bitcoin Yours
2. Why Bitcoin Addresses Start With 1, 3, or bc1
3. Bitcoin Actually Runs on a Tiny Programming Language

From double spending and the Byzantine Generals Problem to 51% attacks, mining hardware, pools and the network after the last coin.

1. Double Spending Problem
2. Byzantine Generals Problem
3. 51% Attack

What a public ledger reveals, and how habits, CoinJoin, silent payments and ecash reduce it.

1. The Bitcoin Blockchain Is a Public Ledger Anyone Can Read
2. Keeping Your Bitcoin Transactions From Being Traced
3. CoinJoin

The layer-two landscape, running channels and liquidity, Lightning login and machine-to-machine payments.

1. Bitcoin Is Slow Only If You Ignore the Layers Built on Top
2. Opening Lightning Channels and Managing Liquidity
3. Logging In With Nothing but a Lightning Wallet

The rules in Korea, the US and Japan, preparing for Korean taxation in 2027, and deductions for donations.

1. Bitcoin Taxes Explained: Rules in the US, Korea, and Japan
2. 22% Tax on Crypto Gains in Korea Starting 2027
3. Five Tax-Saving Scenarios to Audit Before Korea's 2027 Crypto Tax

Buying on a Korean exchange and withdrawing to your own wallet, the kimchi premium, the travel rule, won stablecoins and tax.

1. Buying Bitcoin in Korea and Walking It Out of the Exchange
2. The Three Walls Behind the Kimchi Premium
3. Korea's Travel Rule Drops Its Won 1 Million Floor