Cold Vault
A contract you deploy for yourself. You alone choose who receives what, and when. The library never holds it, cannot open it, and takes nothing from it.
Sepolia testnet · source verified · not audited · do not deposit real funds
In plain words
A wallet is your own account on a blockchain. A contract is a program nobody can change. A testnet is a practice network with no real money. Cold Vault is not offered where it is not legal, including mainland China, and a vault is not a legal will.
How it works
Set the plan
Heirs, shares, and two or three keepers you trust.
Live as usual
Check in from your own wallet now and then. Each check-in resets the clock.
If you go silent
After the silence period (6 months by default), 2 of 3 keepers confirm. Then a 28-day veto window, in which you or any keeper can stop it.
Heirs claim
Each heir claims only their own share, from their own wallet. No account, no ID.
Try it with a fake clock
No wallet, no network. Press the buttons and watch what the contract would do.
Questions
Can my heirs take it while I am still here?
No. Only after the silence period, two keepers and the veto window. One check-in from you cancels everything pending.
What does it cost?
No fee. You pay only the network’s own transaction costs.
What if Cold Library disappears?
The contract lives on-chain with no admin. Heirs can claim from any wallet through a block explorer. The steps are also in the public repository.
Why not just write the recovery phrase in my will?
Anyone who reads it can take everything, at any time, including while you are alive. A vault pays only the registered wallets, only by the rules.
Compared by kind
| Cold Vault | Phrase in a will | A friend keeps the key | |
|---|---|---|---|
| Who can move it while you are here | Only you | Whoever reads it | Your friend |
| Needs us to keep working | No | — | — |
| Fee | None | A lawyer’s | None |
| Heirs need ID | No, their own wallet | Usually | No |
The contract
| Contract | Network | Test functions | Audit | Source |
|---|---|---|---|---|
| ColdVault v0.1 | Sepolia | 27 | Not yet | verified |
The vault desk
Testnet only until the audit. Every action is signed in your own wallet; this page never sees your keys.
No wallet found in this browser. You’ll need a browser wallet (for example MetaMask) on the Sepolia testnet; it is free and has no real money.
My vaults
A vault I keep or inherit from
Read the whitepaper →Contract source →If someone left you a vault →