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Tiếng ViệtSelf-custody basics: keeping your own keys
by PrivaccUpdated September 21, 20262 min read
Self-custody means you hold the keys to your own funds. No company can freeze your account, and equally, no company can restore your access if you lose the keys. The trade-off is total: complete control, complete responsibility.
On this page
What the seed phrase actually is
Your seed phrase — typically twelve or twenty-four words — is not a password. It is a compact encoding of the master key from which every private key in your wallet is derived.
Anyone holding those words has your funds, on any device, without needing anything else from you. There is no second factor and no reset.
Storing it
Write it on paper or stamp it into metal, and keep it somewhere only you can reach. Metal survives fire and water; paper does not.
Do not photograph it, do not put it in a password manager or notes app, and do not email it to yourself. Anything that syncs to a cloud is a copy on someone else's computer.
No legitimate support person will ever ask for it. That request, in any form, is always an attempt to steal from you.
The threats that actually happen
Most losses are not sophisticated hacks. They are people typing their seed phrase into a fake site, approving a malicious transaction, or downloading a wallet app from a search advertisement rather than the real site.
Signing is the moment of risk. Read what your wallet is asking you to approve. A request for unlimited spending approval on a token deserves a second look.
Practical habits
Use a separate wallet for experimenting with new tokens, and keep long-term holdings in a wallet that never touches unknown sites.
For meaningful amounts, use a hardware wallet — the key never leaves the device, so a compromised computer is not enough to lose funds.
Bookmark the sites you use and navigate from bookmarks. Search results and advertisements are a common vector for convincing fakes.
Frequently asked questions
What happens if I lose my seed phrase?
The funds are unrecoverable. There is no reset, no support desk and no backup held by anyone else. This is the direct consequence of self-custody.
Is a hardware wallet necessary?
Not for small amounts. For holdings you would be upset to lose, it is the single biggest improvement you can make — the private key never leaves the device, so malware on your computer cannot extract it.