Articles on Security
Long-form, source-linked analysis of Bitcoin wallets, tools, network behavior, attack surfaces, and the tradeoffs behind serious self-custody.
Primal Wallet for Beginners: Zaps, Lightning, and a COLDCARD Backup
A beginner guide to Primal's self-custodial Spark wallet, Lightning payments and zaps, with an optional COLDCARD Seed Vault recovery copy.
Bitcoin ToolsWhy mempool.space Matters for Bitcoin Users
How mempool.space makes Bitcoin fees, pending transactions and blocks visible, why self-hosting matters, and how COLDCARD NFC PushTx works with it.
Lightning and Self-CustodyLightning for Beginners: BULL Wallet for Spending, COLDCARD for Savings
A beginner guide to Lightning payments with BULL Wallet, its Liquid tradeoffs, and moving larger savings to COLDCARD cold storage.
Hardware Wallet SecurityWhy an Air-Gapped Computer Is Not Enough
Why taking a Bitcoin computer offline does not solve malicious software, key isolation, trusted displays, recovery, stress, or coercion.
Hardware Wallet SecurityA Raspberry Pi Is Still a Computer: Why Bitcoin Needs a Purpose-Built Hardware Wallet
A balanced look at Raspberry Pi, ESP32, stateless signers, evil-maid attacks, and why long-term savings need purpose-built hardware.
Hardware Wallet SecurityA Clean Phone Is Still a Computer: Why Serious Bitcoin Needs a Hardware Signer
Why a wiped phone still lacks the key isolation, trusted display, narrow attack surface, and physical defenses of a purpose-built Bitcoin signer.
Hardware Wallet SecurityWhat a Disconnected Phone Still Cannot Do
Why taking a phone offline helps, but does not provide the key isolation, boot controls, or independent transaction review of a dedicated Bitcoin signer.