Overview
TapDano is a Cardano project that makes NFC smart cards you tap against a phone to prove something is real. The cards pair with a unique on-chain token, so a single tap can confirm a physical product is genuine, log that someone showed up to an event, or safely store the recovery words for a crypto wallet. What sets it apart is that the card itself cannot be copied, and the proof it produces is recorded on a public blockchain anyone can check.
The technology is built entirely on Cardano and grew out of a grant from Project Catalyst, Cardano's community funding programme1. NFC is the same tap-to-connect wireless chip already in modern phones and bank cards, and an NFT is a one-of-a-kind digital token tied to a specific item or person. TapDano joins these two ideas so a physical card carries a verifiable on-chain identity. It is listed on the official cardano.org apps directory under Identity2.
Key Features
- Cards that cannot be cloned. Each TapDano card holds a private signing key on a secure chip, and that key can never be read off the card, so no one can produce a convincing copy3.
- Proof anyone can check. A Cardano smart contract verifies each card's digital signature on the public ledger, letting people confirm a specific card produced it without trusting any company in the middle4.
- Tap-to-back-up wallet recovery. The Seed Phrase Vault app stores a Cardano wallet's recovery words on a physical card, so you tap to back them up and tap to restore instead of writing a long phrase on paper5.
- Real-world attendance records. NFC cards signed at entry and exit can log that someone attended a training session or event, with each record written to Cardano for later verification6.
- Open-source and free to inspect. TapDano publishes its card firmware, software toolkit, and on-chain verification contract on GitHub, where anyone can read the code or contribute7.
What to Expect
For everyday users, the most approachable entry point is the Seed Phrase Vault app on Google Play and the Apple App Store. You install it, tap a TapDano card to your phone to save your Cardano wallet recovery words, and tap again whenever you need to restore them. The recovery words stay on the card in your hand rather than on a server, and the app does not share your data with third parties.
For businesses and organizations, TapDano works as authentication and identity infrastructure. A product maker can attach a card to verify a physical item is genuine, and an employer can hand out cards that employees tap to record attendance. The Cardano Foundation has documented a trial with the Brazilian energy company Petrobras, where staff tap a card at the start and end of mandatory training and each tap is signed and stored on Cardano for independent verification6.
For developers, the project is fully open. The GitHub repositories include the card firmware, a software toolkit for building apps that talk to the cards, and the Cardano contract that checks signatures on-chain7. The documentation site walks through the architecture and how to get started1. Development is the work of a small team, so the pace is modest, but the products are shipped and running on Cardano's main network.
