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Foundations: Wallets

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Wallets

Mar 21, 2026

What is a Hardware Wallet?

Learn what a hardware wallet is, how it keeps private keys offline, how signing works, and where its security benefits and limits come from.

23 min read

Wallets

Mar 21, 2026

What is a Hot Wallet?

Learn what a hot wallet is, how it works, why it enables fast crypto activity, and why online signing authority creates major security tradeoffs.

24 min read

Wallets

Mar 21, 2026

What Is Key Derivation (BIP32/39/44)?

Learn how BIP-39, BIP-32, and BIP-44 turn one seed phrase into a structured wallet tree of keys, accounts, and addresses.

24 min read

Wallets

Mar 21, 2026

What Is ERC-4337? How Ethereum Account Abstraction Works Without Protocol Changes

Learn what ERC-4337 is, how UserOperations, bundlers, EntryPoint, and paymasters enable smart accounts on Ethereum without protocol changes.

26 min read

Wallets

Mar 21, 2026

What Is a Bech32 Address?

Learn what a Bech32 address is, why Bitcoin introduced it for native SegWit, how its checksum works, and when Bech32m is used instead.

22 min read

Wallets

Mar 21, 2026

What is a Cold Wallet?

Learn what a cold wallet is, how offline key storage and signing work, why it improves security, and where backups and device trust still matter.

24 min read

Wallets

Mar 21, 2026

What is a Custodial Wallet?

Learn what a custodial wallet is, how it works, why exchanges use it, and the key tradeoffs around control, recovery, and counterparty risk.

23 min read

Wallets

Mar 21, 2026

What is Address Derivation?

Learn what address derivation is, how wallets turn seeds and keys into addresses, and why derivation rules differ across Bitcoin, Ethereum, and more.

23 min read

Wallets

Mar 21, 2026

What is a Wallet & Blockchain Address?

Learn what wallets and blockchain addresses really are, how keys and HD seeds work, and why address formats differ across Bitcoin, Ethereum, and Solana.

25 min read

Wallets

Mar 21, 2026

What is Account Abstraction?

Learn what account abstraction is, why wallets need it, and how programmable accounts enable recovery, batching, gas sponsorship, and smart accounts.

26 min read