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Bonds key art: in a dark forest, animals each hold a jar of glowing fireflies under a string of lights — there is still light when the network is down.

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Bonds (有備而來): Development Reports on an Ideal Digital Wallet

Development experiments using Taiwan’s government services — the Digital Credential Wallet (TW-DIW), the Mobile Citizen Digital Certificate (TwFiDO), and the MyData personal data exchange service — with the goal of building an ideal digital wallet service that works in practice.

Bonds bonds.twProject sitebackupTW-iOSApp sourcetwdiw-vp-verifier-lite“Show Your Wallet” verifier sourcetwdiw-vc-issuer-lite“Accept This Card” issuer source
Credential and presentation flowTrust and status relationships

ISSUANCE

Issuer

Who issues the card?

Confirm the data, sign a credential, and deliver it to a holder.

“Accept This Card” issues fictional test data to exercise the issuance flow.

Issue a VCVC · OID4VCI

WALLET

Holder

Who keeps the data?

Keep credentials and documents in a wallet; choose when to present them.

MyData files and the government-mail prototype belong on the holding side. Importing a file does not turn it into a VC.

Present proofOID4VP Request proof

VERIFICATION

Verifier

What can you use it for?

Request proof, check it, and decide whether to accept it.

From a self-hosted verifier to parcel pickup at a real convenience store.

Issuer · Publish keys and status
Holder · Identify peers; prepare trust data
Verifier · Check signatures, trust, status

TRUST FRAMEWORK

Trust

Why accept this credential?

Identifiers and public keys, trust lists, credential status, and acceptance rules.

The dashboard observes changes to this information; it does not grant trust.

PRESENTATION

Holder → Verifier

How little can you reveal? Can it work offline?

Two extensions of presentation: what you prove, and how you transmit and verify it.