java

UVerify Java Examples

Runnable Java programs that demonstrate how to anchor certificates on Cardano using the UVerify Java SDK.

Each example is a self-contained JBang script. No build system required.

Prerequisites

• Java 17+
• JBang

# macOS / Linux (via SDKMan)
sdk install jbang

# macOS (via Homebrew)
brew install jbang

Sandbox

Start the local sandbox before running examples against it:

cd ..
uv run sandbox.py start

See the sandbox README for details.

Running an example

cd diploma
jbang Diploma.java

Each example looks for a wallet.txt file in the working directory. On first run a fresh 24-word mnemonic is generated, the wallet is funded from the UVerify testnet faucet, and the phrase is written to wallet.txt. Subsequent runs restore the same wallet.

Keep wallet.txt private — it holds your private key phrase.

Examples

Directory	Description
diploma/	Batch-issue 3 diplomas for TU Munich graduates
digital_product_passport/	Issue a full EU Digital Product Passport for an EV
laboratory_report/	Issue 2 GDPR-safe lab reports with measured values
certificate_of_insurance/	Issue a Certificate of Insurance with coverage details
pet_necklace/	Lost-pet necklace with privacy-preserving owner data
product_verification/	Product authentication certificate with QR-code URL
notary/	Certify a file, a service agreement, and song lyrics
document_integrity/	Anchor a file hash with a drag-and-drop verifier
tokenizable_certificate/	Issue a certificate redeemable as a CIP-68 NFT pair

Network

All examples target the Cardano preprod testnet. Verification deep links open at https://app.preprod.uverify.io/verify/….