You control the keys
Self-custody means you control the private keys that authorise spending.
21Relay Self-Custody
Hold your own keys.Take responsibility for your bitcoin.
Self-custody means controlling the private keys that authorise access to your bitcoin instead of leaving that control with an exchange, custodian or financial service.
Beginner friendlyEducation firstNo wallet connection required
Self-custody in simple terms
Ownership means controlling the keys
Bitcoin is controlled through private keys. A wallet uses those keys to sign transactions and prove that you are authorised to spend.
When an exchange holds your keys, it controls the ability to move the bitcoin. You may have an account balance, but you are relying on that company to honour withdrawals.
With self-custody, the keys are under your control. That gives you independence, but it also means you are responsible for security, recovery and safe operation.
Core principle
Whoever controls the private keys controls the ability to spend the bitcoin.
A wallet application is an interface. The keys are what provide control.
Core principles
What self-custody actually involves
Self-custody is more than installing a wallet. It is a complete system for creating, protecting, using and recovering keys.
You control the backup
You are responsible for keeping recovery information private, accurate and recoverable.
You verify addresses
Always confirm receiving addresses and transaction details before approving a payment.
You reduce third-party trust
Your funds do not depend on an exchange or custodian remaining available or solvent.
Self-custody learning path
Build a setup you understand
Start with wallet fundamentals, then move into backups, hardware, operational security and more advanced setups.
Lesson 01
Wallet Types
Understand hot wallets, cold wallets, mobile wallets, desktop wallets and hardware devices.
Open lessonLesson 02
Seed Phrase Security
Learn how recovery phrases work, how to back them up and what must never be shared.
Open lessonLesson 03
Hardware Wallets
Understand signing devices, offline key storage and the role of a hardware wallet.
Open lessonLesson 04
Security Checklist
Follow a practical checklist covering backups, verification, privacy and recovery testing.
Open lessonLesson 05
Multisig Basics
Learn how multiple keys can protect one wallet and reduce single points of failure.
Open lessonHot wallet
Convenient for regular use
A hot wallet operates on an internet-connected device. It is useful for smaller amounts and regular payments but has a larger attack surface.
Cold storage
Designed for stronger isolation
Cold storage keeps signing keys separated from general internet-connected devices. It is commonly used for larger or long-term holdings.
The most suitable setup depends on the amount, purpose and risk level involved.
Wallets and nodes
Keys control spending. Nodes verify Bitcoin.
A wallet protects and uses your private keys. A node verifies transactions, blocks and the Bitcoin rules.
Connecting your wallet to your own node can reduce reliance on external servers and improve privacy, but the wallet and node still perform different jobs.
Wallet
Creates addresses, protects keys and signs transactions.
Node
Verifies transactions, blocks and consensus rules.
Common risks
Losing every valid backup
Sharing a seed phrase with another person or website
Storing recovery information in insecure cloud services
Approving a transaction to the wrong address
Buying a compromised or preconfigured hardware wallet
Creating a system so complicated that recovery becomes impossible
Core responsibilities
Keep private keys and seed phrases confidential
Maintain at least one reliable recovery backup
Test your recovery process before storing significant funds
Verify wallet software and hardware sources
Use a setup you understand and can operate calmly
Keep inheritance and emergency access in mind
Start with the basics
Learn how wallet types differ
Begin by understanding the difference between hot wallets, cold storage and hardware signing devices.