Your crypto goes to your family —
on-chain.

Engineered for capital you can't afford to lose

• Non-custodial

  We never hold your keys

• Security-reviewed

  Slither · Halmos · Foundry

• Open-source

  MIT · verifiable on-chain

• Formally verified

  51 Halmos proofs

• AML / OFAC

  Sanctions screening

Mock data · Your real dashboard updates live over websocket

Illustrative scenarios · Not customer testimonials · Not legal or tax advice

• Is HeirVault really non-custodial? What does that mean?

  Yes. The smart contract holding your assets is deployed from your wallet flow, and HeirVault does not hold custody keys or sign transfers from your vault. Protocol controls still exist: EVM/TRON pauses are bounded, V3 upgrades use a 7-day timelock, and VaultMultiSig proposals wait 3 days before execution.
• What happens if HeirVault the company disappears tomorrow?

  Your vault keeps working on-chain. The recovery page provides an offline packet and raw transaction guidance so heirs can use wallets and block explorers without relying on our hosted app. Read the full recovery playbook at /recovery — it walks through the practical steps your family would take.
• Who can see my seed phrases or private keys?

  No one at HeirVault, ever. We don't collect, request, or store seed phrases. Your keys stay in your wallet (MetaMask, Ledger, Rabby, etc). The only thing the contract knows is the address of your heirs and guardians — not their keys.
• How does the dead-man's switch actually work?

  You choose a check-in interval (90 or 180 days). Before the deadline, the dashboard guides you through an on-chain check-in transaction, or you can interact with the vault directly from your owner wallet. Email and Telegram reminders can nudge you, but messages do not reset the timer. If the deadline passes with no confirmed owner activity, your heirs can initiate a claim. You can extend or cancel at any time.
• What if I'm in a hospital or coma and can't check in?

  This is exactly what guardians are for on EVM/TRON/Solana vaults. Up to 10 trusted people can push the deadline forward — capped at 90 days per active claim and 180 days across the vault's lifetime, with a 24h cooldown per guardian. They can also cancel a scheduled emergency recovery during its timelock. They can't withdraw or redirect anything. Bitcoin guardians are different: an optional BTC guardian public key is a co-signer trust role, not an extension-only smart-contract role.
• Can my guardians collude to steal from me?

  On EVM/TRON/Solana vaults, guardians cannot withdraw, change heirs, or redirect funds. Their live powers are deadline extension and scheduled-recovery cancellation. If coordinated extensions block a legitimate claim, heirs can dispute a guardian with the vault's required signature threshold or call emergencyResetExtensions once the 90-day emergency threshold is reached during an active claim. Bitcoin guardian co-signers have a different trust model and should be chosen as fund-access co-signers.
• How do I choose the right multisig (M-of-N)?

  The Playbook has a full chapter on this. Rule of thumb: 2-of-3 for most families (one heir lost, you still inherit), 3-of-5 for family offices with independent oversight, 2-of-2 if your heirs live together. The contract supports up to 10 heirs with any M-of-N combination where M ≤ N.
• Which blockchains does HeirVault support?

  9 live vault networks today: Ethereum, Base, Arbitrum, Polygon, BSC, Avalanche, Bitcoin (Taproot multisig), Tron, and Solana. Hyperliquid wallet/token metadata is tracked, but vault deployment appears only after a factory address is configured. All from one dashboard, with each vault keeping its own native on-chain check-in timer. Linked EVM vaults can relay supported claim and guardian actions through CCIP; Bitcoin, Tron, and Solana use their native flows.
• How is Bitcoin handled — it doesn't have smart contracts?

  We use Taproot (P2TR) script-path multisig. Your BTC sits in a native Bitcoin output with a Taproot script that encodes the same M-of-N heir intent. Bitcoin claims use a native PSBT signing and broadcast flow, not wrapped BTC, bridges, or the EVM transaction path.
• What about taxes? How will my heirs be taxed?

  HeirVault generates tax reports with stepped-up basis calculation at the moment of inheritance (US, EU, UAE, Singapore covered out of the box). We are not your accountant — the report is designed to hand to one. Cross-border cases are in the Playbook.
• I live in one country, my heirs live in three others. Does this work?

  This is one of our most common use cases — see /use-cases/expat. The vault can execute on-chain, but probate, forced-heirship, translation, and tax questions still depend on local law. The legal kit records your intent and highlights review points for counsel.
• What are the gas fees to set up or claim?

  Setup: one vault deployment (typically $3–20 depending on chain and gas at deploy time). Ongoing check-ins are owner transactions: L2s are usually low cost, while Ethereum mainnet gas varies. Email and Telegram reminders are free, but they do not reset the on-chain timer. Claim: one commit + one execute transaction per heir who wants to pull (L2s make this $0.10–2, Ethereum mainnet $10–50).
• Is the vault upgradable? Can HeirVault push an update that steals?

  V1 and V2 vaults are immutable clones — nothing to upgrade, nobody can change the code. V3 uses a beacon proxy behind a 7-day timelock: any upgrade is announced, auditable on-chain, and you have 7 days to exit to an immutable clone if you don't trust the change.
• Can I cancel or change my vault later?

  You can update heirs before a claim, manage guardians with cooldowns, change supported settings, or use the owner recovery path while no claim is active. Some changes are timelocked or chain-specific, and active claims/pause state can temporarily block state-changing actions.