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digital-card-twin

The trust layer for graded cards.Fast lookup, immutable proof.

The first fingerprinting protocol that transforms paper’s molecular structure into inviolable proof of ownership anchored on the blockchain.

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Get started in 30 seconds

New to NFTs? Use these guided entries to verify a card, open your collection space, or manage grading operations.

Verify a certificate

Enter a cert number to confirm authenticity and ownership from a single public page.

Start verification

Open my collection space

Access your digital cards, generate proof links, and report a stolen card in one place.

Open collection

Grading company tools

Submit certificates, track mint jobs, and check blockchain status from the operator console.

Open partner portal

STEP 01

GRADATION

Customer Sends Card

A collector ships the card to an authorized grading company for inspection.

STEP 02

GRADATION

Grading & Authentication

Experts validate authenticity, evaluate condition, and assign the official grade.

STEP 03

DCT

Fingerprint Capture

Microscopic texture and print patterns are scanned to generate a unique physical fingerprint.

STEP 04

DCT

Digital Record Build

Certification data, metadata, and fingerprint hash are assembled into a signed payload.

STEP 05

DCT

Oracle Signing & Mint

The oracle signs the payload and mints the ERC-721 digital-card-twin certificate on blockchain.

STEP 06

GRADATION

Card Returned to Owner

The graded slab is returned while the on-chain twin anchors ownership and provenance.

STEP 07

DCT

Public Verification

Any buyer or marketplace can verify grade, ownership, and anti-theft status in seconds.

Seller to buyer, end-to-end.

Designed for external marketplaces (Vinted, eBay): payment happens on marketplace rails while title transfer is secured in DCT.

01

List

Seller posts the card with DCT proof and marketplace link.

Seller listing with DCT certificate

02

Lock

Seller locks the title for the buyer.

Seller transfer initialization

03

Ship

Card ships while the title stays reserved.

Buyer receives reserved title notification

04

Inspect

Buyer checks the card and confirms receipt.

Buyer visual inspection with master scan

05

Transfer

Ownership moves automatically to the buyer.

Atomic ownership transfer completed

How stolen reporting works.

Owners can report a stolen card from the collection space, and buyers instantly see the stolen warning on public verification.

01

Owner reports from the collection space

From the owner card in the collection space, one click marks the digital-card-twin as reported stolen and anchors the status on-chain.

Owner collection card with reported stolen state

02

Public search shows warning

Anyone searching the certification page immediately sees a reported stolen warning badge before purchase.

Public certificate page showing reported stolen badge

Feature Deep-Scan

Beyond plastic: molecular DNA.

A certificate number can be copied. The molecular structure of matter cannot.

AI Fingerprinting

01/04

AI fingerprinting

Our technology does not read a label. It analyzes the card's physical biometrics.

  • Print rosettes: each press pass creates a one-of-one ink-point constellation.
  • Fibrous structure: cellulose arrangement at micron scale acts like a natural fingerprint.
  • Ink micro-relief: shape and density variations in ink-dot patterns verified by the engine.

Result: a 256-bit Integrity Hash is generated and anchored on blockchain. If the card is removed or substituted, DNA no longer matches and the Twin becomes invalid.

Comparison Evidence

CV_ALGORITHM: LBP_TEXTURE_MAPPING
Standard slab scan

Standard view: vulnerable to slab counterfeiting.

Microscopic x200 scan of fibers and rosettes

digital-card-twin view: unique and unforgeable molecular fingerprint.

API Trust Response

{
  "status": "Verified",
  "digital_card_twin_id": "BT-7729-X",
  "dna_match_confidence": "99.98%",
  "blockchain_anchor": "blockchain-mainnet",
  "integrity_check": "PASS",
  "anti_theft_status": "Secure"
}

Kill-Switch

02/04

Kill-Switch Protocol: make stolen cards unsellable.

A stolen card has no value when it can no longer be authenticated.

  • Instant reporting from wallet: STOLEN status propagates in real time to partner explorers and marketplaces.
  • Ownership title freeze: digital-card-twin NFT transfer is blocked, so legal title stays with you on-chain.
  • Scan alert: if a receiver tries to verify with the app, a recovery alert can include scan location data.

Irreversible sentence: a graded card without a clean digital-card-twin can lose up to 90% of market value.

Comparison Evidence

BLOCKCHAIN: SMART_CONTRACT_LOCK
Application proof surface

Kill-Switch Protocol

STATUS: STOLEN / BLACKLISTED. The protocol removes the thief's economic incentive.

Certified Ownership

03/04

Marketplace + Atomic Title Settlement

The marketplace handles payment and shipping. DCT secures ownership transfer with transaction lock, buyer-confirmed release, and dispute-aware safeguards.

  • Buyer forgets to confirm: time-lock auto-transfer after 10 days if no dispute is opened.
  • Seller unresponsive: buyer can submit delivery proof + received-card photo; transfer can be force-completed after 48h review.
  • Buyer reports mismatch: transfer is frozen in dispute escrow until evidence resolution.

Result: ownership either settles atomically or remains safely escrowed while dispute evidence is processed.

Comparison Evidence

PROTOCOL: ERC-4337_ATOMIC_SWAP
Application proof surface

Safety Nets for Edge Cases

Time-lock fallback, evidence-based arbitration, and dispute freeze protect both seller and buyer without breaking chain-of-title integrity.

Trust DCT not Humans

04/04

Trust, but Verify. Instantly.

Generate a dynamic QR from your vault. When scanned, the protocol performs a real-time handshake with blockchain to confirm the seller controls the digital title.

Comparison Evidence

NETWORK: REAL-TIME_HANDSHAKE_V1
Application proof surface

Instant Public Verification

The check surface validates ownership live and returns a cryptographic trust signal in seconds.

Start certificate verificationSeal my collection

FAQ for first-time users

Short answers for collectors who are new to NFTs and on-chain certificates.

Do I need to understand NFTs to use this app?

No. You can search a certificate number and read a simple authenticity and ownership result without using a wallet.

What is the collection space?

It is your personal area to manage your digital-card-twin certificates, generate proof links, and report stolen cards.

How do I verify a card before buying?

Use the verification form with the certification number. You get card details, owner signal, and anti-theft status on one page.

Why is blockchain used here?

It makes certificate records tamper-resistant and publicly auditable, so buyers and sellers can verify the same source of truth.

Product Roadmap

From protocol to industry standard.

Our path to eliminating fraud in the TCG grading market.

CompleteNow

Protocol core is live in the codebase

  • ERC-721 registry, oracle adapter, and grading company registry
  • Public certificate, share, and check flows in the demo app
  • Vault flow with ownership views and stolen reporting
  • Integration and infrastructure docs already in the repo
Thinking PeriodPilot

Partner thinking period and open co-design

  • Dedicated sessions for partners to answer, think, and brainstorm with us
  • Roadmap priorities refined with partner feedback and edge cases
  • Shared problem framing before production commitments
  • Decisions logged with clear follow-up actions and owners
In ProgressBuild

Partner operations are being hardened

  • Lab partner console with gated access and submission flow
  • Webhooks, batch-submit, and job tracking endpoints
  • Seller and buyer marketplace actions in Vault (initialize lock, confirm, dispute)
  • Seller can attach a marketplace listing link directly to the DCT
  • PAF-assisted submit and verify flows wired in the demo
  • Operational rollout still depends on environment and partner setup
UpcomingNext

Integration breadth and production hardening

  • Multi-grader operational wiring for the 3-company Genesis cohort
  • Broader SDK, indexer, and partner integration surface
  • Hardening of operator tooling and deployment paths
  • Cleaner source-of-truth alignment between product docs and UI
PlannedLater

Lifecycle and protocol expansion

  • Support for grade.updated and grade.voided lifecycle actions
  • Complete KMS transaction-signing path in the oracle
  • Governance, cross-chain, and larger ecosystem rollout
  • No volume or partnership milestone should move here without proof
Business Contact

Contact the team

Questions about integrations, certificate issuance, or commercial deployment? Reach out directly.

Grading companiesMarketplacesStrategic partners

We reply to grading companies, partners, and collectors evaluating the protocol for production use.

Emailengineering@digital-card-twin.com

Typical topics

API and issuance integration
Pilot launch planning
Operational and compliance questions
Write to us