Name: Handoff Vault
Brand: DEPLOYR
Price: 179 USD
Availability: PreOrder

Picture this

Who it is for

Dele holds savings across three wallets and nobody in his family knows how any of it works. Handoff Vault lets him write plain-language instructions, encrypt them to two trusted contacts, and set a check-in heartbeat; if he misses 90 days of check-ins, the guardians get the letter, never his keys.

Two ways to own it

What you get

Base$179

$45 deposit to reserve

Heartbeat contract, encrypted letter builder, two to five guardians, email and wallet check-in reminders.

You choose: chain
You choose: name and logo
You choose: accent color
You choose: heartbeat interval

Customfrom $1,200

Built around you

Reshape it entirely: new features, your flows, your brand end to end, integrations you need. We scope it with you.

Everything in Base
Custom features and design
Priority build

Why it is new

What exists today, and what this does differently

Why own your own

Onchain inheritance is an established category; differentiation would be clarity of instructions and UX.

Closest things out there

Dead man's switch inheritance is built by Sarcophagus, Casa and Nunchuk timelocks, plus many hackathon builds (DeadSwitch, Inheritance Switch, Digital Executor).

Checked with web searches in October 2026. A search is not proof that nothing similar exists, and the market moves fast, so we recheck before every build.

What it unlocks

The human in it

Turns your care for family into a durable, verifiable plan.

The Regatta Board

Races it can enter

grant · Base · rolling

Base Builder Grants

rolling, retroactive

Official page ↗

Fits safety-first consumer apps on Base; existing shipped projects OK (retroactive).

Their rule on existing code: Existing shipped projects OK (retroactive)

grant · Ethereum Foundation · rolling

Ethereum Foundation ESP

rolling

Official page ↗

User safety public good angle; existing projects OK.

Their rule on existing code: Existing projects OK

What you own

The whole app, not a starter kit.

The complete Handoff Vault app: people write plain-words instructions for their crypto, seal them to two or more guardians, and check in now and then, with a paywall and helper agent built in. Never their keys.

Base price · $179

The user app, complete

Every buyer gets the same finished app. Basic branding and copy changes come through a quick form.

Three step onboardingHome

Shown once: write the way not the keys, seal it to two guardians, check in now and then.

Heartbeat status and one tap check-inHome

Day count, progress bar, streak and the I'm OK button on the first screen.

Plain-words letter builderLetter

Pick accounts to describe, a line for the family and free text, sealed with a fingerprint.

Recovery words guardLetter

Text that looks like a seed phrase blocks sealing and points to a lawyer or safe.

Letter history and restoreLetter

Every sealed version listed. Gated behind Family.

Guardian invites and thresholdGuardians

Two to five guardians with phone login, all together or any one to open. Third guardian gated behind Family.

Quarterly key tests and re-sealGuardians

A dummy letter catches a lost phone; re-seal to the new key in one tap. Gated behind Family.

Escalating remindersHeartbeat

Interval slider, reminder ladder and a guardian call before the deadline. SMS and WhatsApp gated behind Family.

Three story simulatorHeartbeat

Travel, hospital and early request paths, with guardian confirmations and the opened letter.

Onchain receipts and early release logVault

What is onchain, what never is, and every refused early request.

Plans, share card and settingsMe

Pricing from the owner paywall with USDC checkout, share card, permissions and vision.

Open the full app demo

Add-on

Owner console

Your admin side: revenue, paywall editor, users, rules and the agent log.

Revenue and paywall editorRevenue

MRR, incoming USDC payments, payouts, payment methods and live editing of tiers and gates.

Safety deskSafety

Live queue of refused early release requests and the scam patterns watched.

RulesRules

Minimum guardians, default heartbeat, chain, guardian call, seed warning, alerts and gas sponsoring.

Agent log and roadmapAgent

What the reminder agent did and how it adapted, plus the priced Roadmap screen.

Top-up

Growth and referrals

Referral and growth mechanics, switched on when you are ready to grow.

Growth loops and cohortsGrowth

Guardian to keeper loop, law firm onboarding, referrals and cohort retention.

The money path, built in

How it earns for you

Writing and sealing a letter is free and guardians never pay. Keepers pay for loud reminders and family tools, and law firms pay to offer it to every client.

KeeperFreeOne sealed letter, two guardians, email and wallet reminders, early release lock

Family$3 a monthSMS and WhatsApp escalation, up to five guardians, quarterly key tests, letter history

Planner$49 a monthPaid by a law firm: Family for every client, branded letters, client check-in overview

No fee is ever charged to open a letter. Check-in gas (under $0.01 on Base) can be sponsored by the owner.

Prices are yours to set. Illustrative, not a promise of income.

Growth loops, built in

How it spreads

Guardian to keeper: every letter invites two people who often seal their own
Law firms on Planner onboard their clients in a batch
Share card after sealing: I wrote my family the letter I kept putting off
Keeper to keeper referral codes worth three months of Family for both

Roadmap · build the next phase with us

Where it goes next

v1 included

The full keeper app

Letter builder with seed phrase guard
Two to five guardians with threshold opening
Heartbeat with escalating reminders
Early release lock and owner alerts
Paywall and USDC checkout

Included

Planner portal

Law firm dashboard with client check-in overview
Branded letters and invite codes
Guardian handbook in Yoruba, Igbo, Hausa and French
Bulk client onboarding

Add-on from $450

Multi-asset handoff

Optional timelocked safe module for a small emergency fund
Bitcoin and Solana wallet descriptions
Guardian video message
Yearly plan review with a lawyer

Add-on from $950

For investors and grant reviewers

The pitch, ready

A sealed letter for the people you trust, opened only if you go quiet. Never your keys.

Problem: Millions hold crypto nobody in their family could find or use. If they die or cannot act, savings are lost or relatives pay strangers who claim they can recover it.

Solution: A plain-words letter encrypted to two or more guardians, released only after a missed heartbeat, loud reminders, a guardian call and guardian confirmation. Only a fingerprint and the timer go onchain.

Why now: Cheap check-ins on Base, embedded phone and email wallets for non crypto relatives, and threshold encryption make a family-friendly handoff practical.

Market: Self-custody holders with family who do not use crypto, plus the lawyers and planners who serve them.

The ask: Pilot partners: two law firms in Lagos and London, and grant support from Base Builder Grants and Ethereum ESP.

Funding is never guaranteed. Check each program's rules.

For hackathons and demo days

Your 2 minute demo

Home: meet Dele, 41, in Lekki at 23:42, day 74 of a 90 day heartbeat.
Letter: describe three accounts, pick a line for the family, try pasting recovery words and see it refuse to seal.
Guardians: Funmi and Chidi must both agree; run a key test and re-seal to Chidi's new phone.
Heartbeat: email only went to spam, unlock SMS with Family through USDC checkout.
Heartbeat: play the travel, hospital and early request stories.
Vault: what is onchain, what never is, and the refused early request.
Owner Revenue and Safety: edit the Family price live and simulate a scam request.
Owner Growth and Roadmap: a guardian becomes a keeper, then request the v2 planner portal.

Many hackathons require code written at the event. See the Regatta Boardfor each race's rule.

Make it entirely yours

Custom work from $1,200: your own guardian flows and languages, a law firm or bank branded deployment, extra chains, or integrations with an estate planning CRM. Scoped on a call.

Custom from $1,200

BLUEPRINT

Why it matters and how it really works

The need

Millions of people hold crypto that nobody else in their family could find or use. If they die or become unable to act, savings are lost, or relatives pay strangers who claim they can recover it. People want to leave clear directions without handing over their keys while they are alive.

What exists and what is new

Onchain inheritance is an established category. Sarcophagus runs a decentralised dead man's switch, Casa and Nunchuk offer timelocked inheritance plans for bitcoin, and many hackathon builds (DeadSwitch, Inheritance Switch, Digital Executor) implement heartbeat release. Handoff Vault does not claim a new mechanism. Its focus is clarity and UX: a plain-words letter builder, release of instructions rather than keys, escalating reminders across channels with a guardian ping before the deadline, guardian key tests, and a hard refusal of early release while the heartbeat is live. Research verdict: exists, low novelty.

The data it runs on

The sealed letter (encrypted client side to guardian keys), the heartbeat timer and check-in times, guardian addresses, reminder channel settings, and confirmation events. The letter text is never stored readable by the service and never published onchain; only its fingerprint and the timer are onchain.

1.The mission

Turn care for your family into a clear, durable plan they can actually follow.

2.Why people can't resist it

Peace of mind in one tap A monthly check-in that takes a second and tells you the plan is current.

Never your keys Guardians get the way, not the money. Recovery words can stay with a lawyer or in a safe.

Loud before it opens Reminders escalate across email, SMS and WhatsApp, and a guardian is asked to call you before anything happens.

3.How it works for real

Heartbeat contract: A small contract on Base (or Arbitrum or Polygon) records check-ins from the owner's wallet and exposes whether the heartbeat has lapsed.

Letter encryption: The letter is encrypted in the browser. The key is split with threshold encryption (for example Lit Protocol conditions or Shamir shares) so guardians can decrypt only after the contract reports a lapse and the required guardians confirm.

Storage: The ciphertext is pinned to IPFS or Arweave; only its hash sits onchain.

Wallets: Privy embedded wallets for owners and guardians with email or phone login, so family members do not need crypto experience.

Reminders: A scheduler sends escalating reminders by email, SMS (Twilio) and WhatsApp, then a soft note to a guardian. No AI is needed for release decisions; a small model (Claude Haiku tier) may help draft the letter in plain words if the owner asks.

Guardian tests: Quarterly dummy-letter tests confirm each guardian can still decrypt on their current device.

4.Cost per use and pricing

A check-in on Base typically costs under $0.01 in gas; setup is a few cents. SMS reminders cost roughly $0.01 to $0.08 each depending on country. A typical user with 12 check-ins and a few reminders a year costs well under $2 a year to run, plus storage pinning of a few cents.

Letter Free

One letter, two guardians, email reminders, 90 day heartbeat.

Family $3 a month

Up to five guardians, SMS and WhatsApp reminders, guardian key tests, custom heartbeat.

Advisor $25 a month

For lawyers and planners managing letters for many clients, with co-signed confirmations.

5.Growth loop

Every letter invites two or more guardians, who learn the product by being trusted with it and often write their own. Estate lawyers and planners can offer it to clients.

6.Risks and guardrails

Legal status: A letter is not a will. The app must say so plainly and suggest a lawyer; rules on digital assets after death differ by country.

False release: A missed check-in could open the letter while the owner is alive. Escalating reminders, a guardian call, all-guardian confirmation, and re-sealing on return reduce this.

Coercion and scams: Fake relatives may pressure guardians. Early release is impossible while the heartbeat is live, and the owner is alerted on any attempt.

Lost guardian keys: A guardian who changes phones may lose access. Quarterly tests catch it and allow re-sealing.

Sensitive content: Owners may paste recovery words into the letter. The editor warns against it and suggests storing them separately.

7.Build order

Heartbeat contract with check-in and lapse status
Letter editor with client-side encryption
Guardian invites with embedded wallets
Threshold decryption gated on lapse and confirmations
Escalating reminders by email and SMS
Guardian key tests and re-seal flow

8.Where this is going

Now
Dele seals one letter for his sister and his best friend.
Next
Families keep shared plans for every account, onchain and off, updated monthly.
Later
Lawyers and planners co-sign letters, and handoffs become part of normal estate planning.
The world it builds
No family loses savings, or pays a scammer, because nobody knew the way.

Costs and tools are estimates at the time of writing. General information only, not legal or financial advice.

OWNER PLAYBOOK

Own it, then chart your voyage

Nine routes from one vessel. Tap a port to open its chart.

Why own Handoff Vault

Handoff Vault holds the most sensitive plan a person ever writes: who gets told what if they cannot be reached. When you own it, the heartbeat contract sits on your wallet, the brand on the check-in emails is yours, and every family that trusts it trusts you, not a faraway startup that could sunset the product. That trust is the business, and it compounds into an onchain record of a service that kept its word.

What’s stopping you?

“I am not a lawyer. Is it legal to offer something that sounds like inheritance?”

Handoff Vault is not a will and should never be sold as one. It delivers encrypted instructions to guardians the user chose; it never holds keys or moves funds. Say that plainly on your page, suggest users keep a proper will where they live, and avoid the words estate planning unless a local professional works with you.

“What if the heartbeat fires by mistake while someone is just on holiday?”

The default is 90 days with reminder emails and wallet nudges at 60, 75 and 85 days, and users can pick a longer interval. Even when it fires, guardians only receive a letter, not keys, so a false trigger is awkward, not catastrophic. Tell users to test the flow with a short interval on a dummy letter first.

“Is it really mine, or does DEPLOYR control it?”

The heartbeat contract deploys from your wallet, the payout address is yours, and the domain and brand are yours. DEPLOYR builds and hands over; it does not sit in the middle of your users' check-ins.

“What if nobody trusts a small brand with something this personal?”

That is the real hurdle, and it is why the first users should be people who already trust you: family, your crypto group, your clients. Show the open contract, show that no keys are stored, and let a verified contract plus ten real testimonials do the work before you spend on ads.

“What if it breaks after I stop paying attention?”

The contract keeps running onchain without you, but reminder emails need a live service. Keep the email sender on a plan you pay yearly, set a calendar check each quarter, and write your own Handoff Vault letter explaining how a trusted friend can keep the reminders running if you cannot.

The million-dollar ladder

Families and individual holders pay a yearly plan for active vaults with reminders, plus a one-time setup session for people who want help writing their letter. A second line sells white-label vaults to crypto advisors, accountants and DAO treasuries who want to offer this to their own clients. This is a target, not a promise.

$100

$2,550

$28,000

$85,000

First 10 vaults

10 holders on a yearly plan

$10 per month

Trusted local name

150 holders plus 5 setup sessions a month at $150

$12 per month

Advisor channel

1,200 holders plus 40 advisor seats at $250

$15 per month

Million-dollar run rate

3,500 holders plus 130 advisor seats at $250

$15 per month

Advisor and accountant seats: one professional can bring 20 to 50 vaults with them.
Setup sessions: a paid one-hour call where you help write the letter converts nervous buyers.
Annual billing with a family bundle (up to four vaults) lifts average revenue and cuts churn.
Trust content: a plain explainer of exactly what happens on day 90 is your best salesperson.

Illustrative stages, not a forecast. Results depend on you and the market; nothing here is guaranteed.