Night Guard Wallet

5/5scam scenarios stopped, every run

2/2real family payments let through

0.2 sto the verdict on screen (devnet simulation included)

32/32scam messages Gemma caught · 0 false alarms

7scams refused by the program itself on devnet

1 → 3families on the on-chain scam list: warning → block

The son with a new number: STOP in plain words, then Ana decides

Before and after

	A wallet without a guard	With Night Guard Wallet
Before signing	the program, the accounts and an amount	⛔ STOP in her words, read aloud, in 0.2 s
The 5 scam scenarios	each one signed with one tap	5/5 stopped, nothing signed
The message that came with it	never read	32/32 scams recognised, 0 false alarms
After "approve"	final: nobody can stop it	the vault refuses: 7 refusals on devnet
Her family	finds out after the money is gone	alerted live, decides with her own signature
Other families	each one alone	1 report warns, 3 families block

Why

In 2025, people over 60 reported $7.7 billion lost to fraud to the FBI, $4.3 billion of it involving crypto, $38,500 per victim on average (FBI IC3 2025 Internet Crime Report). On a blockchain there is no bank to call: one signature can't be undone.

Watch it

Before Lucy signs

1 · Simulate on SolanasimulateTransaction on devnet: SOL, tokens, approvals and owners, before and after.

2 · Check the sourcesSender, link, every wallet, every program (age, verified?) and every token (real or fake).

3 · Gemma reads the messageLocal and free. It quotes the scam tricks it finds and explains the verdict in plain words.

4 · The vault enforces itAn Anchor program: trusted contacts, daily limit, guardian approval, cooling-off, community scam list.

See it

STOP screen — **⛔ STOP, in plain words.** The "son" with a new number: not a saved contact, a brand-new wallet, and the vault itself refuses it.

Guardian page — **👩 Ana, the guardian.** Live alerts read from the program's events; she says no with her own signature and reports the wallet.

Community list warning — **🚩 Families protect families.** Reported with on-chain proof; one report is a warning, three families block.

**👵 Lucy's wallet.** Savings in the on-chain vault, trusted contacts, daily limit, and a fake "USDC" flagged.

Measured, not promised

Speed chart — **0.2 s to the verdict.** Simulation on devnet in ~15 ms; Gemma's explanation arrives after and can only add warnings.

Evaluation chart — **32/32 scam messages, 0 false alarms.** Gemma reads the scam story that fixed rules miss.

Community list chart — **Fair community list.** Report only with proof, one vote per family: warning → strong → block.

On-chain proofs chart — **7 refusals on-chain.** Scams forced past the app on purpose, refused by the program itself.

Architecture

What Solana does here

Rule, enforced on-chain	Proven on devnet
Money goes out at once only to trusted contacts, under the daily limit	Forced transfers to the scammer and to a look-alike address: refused, `NotTrusted`
Adding a trusted contact needs the owner AND the guardian	A fake guardian could not add the scammer: `ConstraintHasOne`
Anything else is a request the guardian approves or refuses	A refused request could not be sent: `Rejected`
Big amounts wait a cooling-off period	Sending before it ended: `StillCoolingOff`
Community scam list: report only with proof, one vote per family	No proof: `NoProof` · same family twice: refused · 1 → 2 → 3 families: warning → strong → block

Program guardian_vault: 8BtGEAMv…CTDJ5 on devnet · every transaction linked in RESULTS.md.