A self-custody wallet is a crypto wallet where you, and only you, hold the private keys that control your coins. The wallet provider cannot freeze, lend out or lose your funds, and nobody can restore access if you lose your keys. One limit to know: the issuers of some tokens, such as certain stablecoins, can block an address in the token contract itself.
Custodial vs self-custody
When you keep crypto on an exchange or a similar platform, the platform holds the keys. Your balance is an entry in its database and a promise to pay you on request. That is custody. It is convenient, and it works for as long as the platform stays solvent, secure and willing to let you withdraw.
In a self-custody wallet, also called a non-custodial wallet, the keys are created on your device and stay there. The app is a tool for reading the blockchain and signing transactions. The coins sit on the blockchain under addresses that only your keys can spend from.
| Aspect | Custodial account | Self-custody wallet |
|---|---|---|
| Who holds the keys | The platform | You |
| How you get in | Email and password | Keys on your device |
| Lost access | Reset through support | Only your backup can restore it |
| Withdrawals can be paused | Yes, by the platform | No |
| Main risk | The platform fails or is breached | You lose or leak your backup |
Keys and recovery phrases
A private key is a very large secret number. Whoever knows it can sign transactions for the matching address. The public address is derived from it and is safe to share.
Raw keys are hard to handle, so most wallets generate a recovery phrase, also called a seed phrase: usually 12 or 24 ordinary words. All of the wallet's keys, for every chain, are derived from that phrase. Three things follow.
- The phrase is the wallet. Enter it into a compatible app on a new device and your funds appear again.
- Anyone who sees the phrase can do the same. There is no second factor.
- The app and the device are replaceable. The phrase is not.
Your responsibilities and the real risks
Self-custody removes the risk of a platform failing. It replaces it with risks you manage yourself.
- Loss. If the device breaks and you have no backup, the funds are unrecoverable.
- A leaked phrase. Photos, cloud notes, screenshots and email drafts are the usual leaks.
- Phishing. Fake support agents, fake apps and fake websites all want one thing: for you to type the phrase.
- Signing mistakes. A transaction sent to the wrong address or the wrong network cannot be reversed, and approving a malicious contract can hand over your tokens.
- Inheritance. If nobody can find the backup after you, the funds are lost.
None of this needs technical skill. It needs a few habits.
Nobody legitimate will ever ask for your recovery phrase. Not support, not a website, not an app update.
How to back up safely
- Write the phrase down by hand when the wallet shows it. For long-term storage, a metal plate survives fire and water better than paper.
- Check the spelling and the order of the words.
- Keep it offline. No photo, no screenshot, no cloud document, no email to yourself.
- Store it somewhere private and durable. A second copy in a different location protects against fire or theft at home.
- Test it. Before you deposit a large amount, restore the wallet from the backup once so you know it works.
- Tell a trusted person that a backup exists and how to find it one day, without handing over the words now.
If a single secret feels too fragile for the amount you hold, look at multisig. It splits control across several devices so that no single backup can move the funds. What is a multisig wallet explains how.
Is self-custody right for you?
It suits you if you want direct control, plan to hold for a long time, or want to use on-chain services such as swaps without opening accounts. It asks more of you than an exchange account does. A common approach is to start with a small amount, learn the backup routine and move more only when the routine feels boring.
Some people keep both: a custodial account for moving between regular money and crypto, and a self-custody wallet for what they intend to keep. That works, as long as you know which coins are under whose control.
How THORWallet does it
THORWallet is a self-custody, multi-chain wallet built in Zug, Switzerland, shipping since 2021. It runs on iPhone and Android, as a web app, and as THORWallet Terminal, which is the web app installed as a desktop app on Mac and Windows. You can get it on the download page.
There are two wallet types.
- A seed wallet, backed up with a recovery phrase as described above.
- A multi-device vault, where several of your own devices must sign together. Each device holds its own share and its own backup file, there is no seed phrase, and THORWallet holds no share.
One wallet covers the major chains, including Bitcoin, Ethereum, Solana, XRP and TRON. The wallets page lists them. Support is available 24/7 through chat inside the app. Support can explain and guide, but it cannot recover a lost recovery phrase, because a self-custody wallet means THORWallet never holds it.
How to do it in THORWallet
Step-by-step articles from the help center, checked against the current app.
- How self-custody works in THORWalletWho holds your keys in THORWallet, what THORWallet can and cannot do, and what happens if you lose your phone or your backup.
- How to create a wallet or add another walletCreate your first THORWallet wallet step by step, add a second wallet, switch between wallets, and rename or remove one.
- How to back up your recovery phraseBack up the 12-word recovery phrase of a THORWallet seed wallet, find it again later in Settings, and learn what you must never do with it.
- Stay safe from scamsHow to recognise fake support, fake apps, phishing sites and scam tokens, and what THORWallet shows you to help.
Sources
- BIP-39: mnemonic recovery phrases
- BIP-32: hierarchical deterministic wallets
- ethereum.org developer docs: accounts and keys
- ethereum.org: security and scam prevention
- SEC Investor.gov: crypto asset custody basics for retail investors
- Circle: USDC terms, the issuer's right to block addresses
Reviewed on 12 Nov 2026. Statements about THORWallet were checked against the help center, and the sources above were opened on that day. This guide explains how things work. It is not financial advice.