Custody
Custody describes who controls the private keys required to access and move cryptocurrency. In a self-custody arrangement, the user controls their own private keys or secret recovery phrase. In a custodial arrangement, an exchange, platform, broker, bot provider, or another third party controls the keys on the user's behalf.
✦ Key Insight
Crypto ownership ultimately depends on control over private keys. Understanding custody helps users know who can actually move their funds and what happens if a platform becomes unavailable, hacked, insolvent, or restricted. Self-custody gives users greater control but also greater responsibility. Losing a recovery phrase or signing a malicious transaction can result in permanent losses. Custodial services may simplify account recovery and trading, but users depend on the provider to safeguard and return their assets.
✕ Common Misconceptions
Assuming an exchange balance equals direct on-chain ownership
Losing a recovery phrase
Giving private keys to trading bots
Assuming self-custody removes all risk
Failing to research a custodian's withdrawal policies
Keeping all assets under a single custody model
Detailed Explanation
How It Works
With self-custody, a wallet generates private keys that remain under the user's control. Transactions must be authorised using those keys.
With custodial services, the provider typically maintains wallets containing customer assets and tracks customer balances within its own system.
Custody models include:
Self-custody wallets
Centralised exchange custody
Institutional custody
Multisignature custody
MPC-based custody
Smart contract custody
Bot-controlled trading wallets
FAQs
What does “not your keys, not your coins” mean?
It highlights that someone else ultimately controls the assets when they hold the private keys.
Is self-custody always safer?
Not automatically. It removes third-party custody risk but increases responsibility for security and backups.
Can a custodial platform stop withdrawals?
Potentially, yes. The provider controls the wallets and withdrawal infrastructure.
In Practice
Dig Deeper
Hardware Wallet
A physical, offline device (such as Ledger Nano S/X, Trezor Model T, or KeepKey) that securely stores your cryptocurrency private keys and signs transactions without ever exposing the keys to the internet or your computer/phone.
Private Key
A private key is a secret cryptographic code that proves ownership of crypto assets and allows the holder to authorize transactions.
Secret Recovery Phrase
A secret recovery phrase (also called seed phrase or mnemonic) is a human-readable sequence of 12 or 24 words generated by a wallet that encodes the master seed from which all private keys and addresses are deterministically derived.