Last updated: September 7, 2025
01
Patented address generation
Dual-entity, secrets sealed by independent parties. Neither party can reconstruct your private key.
02
Tamper-evident
by design
Sealed surfaces and inspection steps make interdiction visible before you fund.
03
Local
key derivation
Your private key is derived on your device only and never stored by Coinplus.
04
Offline
by design
No battery, no firmware updates, no radios — drastically fewer remote attack paths.
- Secret 1 is generated, laser-engraved, and concealed under a tamper-evident seal by our independent secure manufacturing partner (Intergraf 14298 & ISO/IEC 27001 certified).
- Secret 2 is generated, laser-engraved, and concealed under a tamper-evident seal by Coinplus, Inc.
- No entity ever sees the other party’s secret. Both travel to you sealed.
- When you reveal both seals and combine the two secrets in the Coinplus app, your wallet’s private key is derived locally for the first time.
- The derived key is never accessible to Coinplus or any third party and never leaves your control.
No security device is “tamper-proof.” Coinplus uses tamper-evident seals so you can see if the product has been opened or altered before you fund it.
Inspect before funding (takes < 1 minute)
1. Check the outer sleeve — it should be clean, flat, and uncut. No tears, dents through the seal area, or tape over seams.
2. Examine the seals closely — the seals on the card covering the secrets should sit flush with edges intact and micro-details crisp. No lifting, bubbles, residue, or signs of re-application.
3. Open only when you’re ready — once the seal is broken, the product becomes customer-controlled.
What to look for:
Lifted corner — peeling or raised edges.
Air bubbles — pockets trapped beneath the seal.
Adhesive residue— sticky marks or ghost patterns.
Pattern mismatch— misaligned print or tamper text.
If a seal is broken or looks re‑applied, do not use the card. Email [email protected]. See Returns & Refunds.
Your card is built through a dual-entity process. Our independent secure manufacturing partner (Intergraf ISO 14298 & ISO/IEC 27001) generates and seals Secret 1, while Coinplus, Inc. generates and seals Secret 2—with strict separation so no one can reconstruct your key.
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Certified facility: Intergraf ISO 14298 (security printing) & ISO/IEC 27001 (info security).
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Separation of duties: Partner handles Secret 1; Coinplus handles Secret 2. Secrets are never co-located.
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Tamper-evident at both steps: Each secret is engraved and sealed before it ever leaves the facility.
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Chain of custody: Serialized units, sealed cartons, dual sign-off on transfers.
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Scrap & remnants control: Destruction logs prevent any leftover material from leaving production.
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Lot QA: Randomized destructive seal tests and visual QA per lot.
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No key on servers—ever: The private key is derived only on your device when you combine the two secrets.
Intergraf ISO 14298
High-security print controls for seals & personalization.
ISO/IEC 27001
Access, logging, change control around sensitive steps.
Separation of duties
No single party can recreate your key.
Tamper-evident seals
You can detect interference before funding.
LOT & serial tracking
Traceability and recall capability if needed.
Intergraf ISO 14298 & ISO/IEC 27001 certifications apply to our independent secure manufacturing partner. Coinplus operates parallel process controls for Secret 2 and end-to-end chain-of-custody.
We protect safe self-custody by splitting your wallet secret across two sealed parts, deriving the private key only on your device, and making tampering visible before you use your wallet.
Each card shows the attacker’s goal, what we do, and what you do.