A companion to Decentralized Professional Credentials that adds field-level selective disclosure. The base protocol required presenting a credential in full; here the holder reveals a chosen subset of claims and keeps the rest hidden – proving where they worked without disclosing role or dates, or proving a certification without disclosing its level. The verifier learns the revealed values and only how many items were withheld. The scheme follows SD-JWT (RFC 9901) and reuses the base protocol’s Ed25519 signatures and did:key identifiers unchanged.

Crucially, it requires no change to the on-chain registry, the smart contracts, or the verification flow: the anchor is the hash of the signed token alone, identical across every presentation, so the extension is backward compatible and adds no on-chain cost. An optional holder binding defends against replay. The proof of concept extends the base PoC on both Ethereum (Solidity) and IOTA Rebased (Move).

A protocol and working proof of concept for transparent tracking of charitable funds throughout their full lifecycle: donation, allocation to specific purposes, and disbursement to recipients. A single Solidity contract holds donated ETH in escrow and records every decision on-chain with timestamps, amounts, and SHA-256 hashes linking to off-chain evidence. The charity retains full operational control; the blockchain adds an independent, real-time audit trail that anyone can query without the charity’s cooperation.

The proof of concept implements the protocol as a single Solidity 0.8.28 contract and exercises it through shell scripts against a local Hardhat node. A “Clean Water Initiative” scenario walks through campaign creation, donations from three donors, allocation to two purposes, disbursement to recipients, and full audit-trail queries. A second scenario demonstrates the refund mechanism for campaigns that fail to reach their funding goal. The paper discusses the trust model (“transparency, not truth”), existing blockchain approaches in the charitable sector, gas costs and Layer 2 deployment, and future directions including stablecoin support, milestone-based release, and fiat on-ramp integration.

A protocol for building provenance records as chains of cryptographically signed attestations anchored on public blockchains. Each attestation – an origin declaration, a transfer of custody, an authentication report, or a significant event – is a signed data structure whose SHA-256 hash is recorded on-chain. The key innovation is that a single asset’s provenance chain can span multiple blockchains: different parties anchor their attestations on whichever chain they prefer, and the chain is stitched together by content hashes rather than on-chain pointers.

The protocol is implemented on two architecturally different blockchains – Ethereum (Solidity) and IOTA Rebased (Move). A demonstration scenario traces a painting through five parties – artist, gallery, appraiser, collector, and restorer – with attestations alternating between the two chains. A cross-chain verification script walks the chain from the most recent attestation back to the origin, checking each link’s on-chain status across all relevant chains. A forgery detection scenario demonstrates that inserting a fake attestation with an unregistered parent hash produces a detectable break in the provenance chain. The paper discusses the protocol design, existing approaches, the EU Digital Product Passport, and future directions including JWT signing, NFT integration, and selective disclosure.

A protocol and working proof of concept for decentralized professional credentials. Issuers create cryptographically signed credentials following the W3C Verifiable Credentials Data Model v2.0. Credential content stays with the holder – no central database, no platform lock-in. SHA-256 hashes are anchored on-chain for tamper-proof verification and transparent revocation.

The protocol is implemented on two architecturally different blockchains – Ethereum (Solidity) and IOTA Rebased (Move) – to demonstrate genuine chain-agnosticism. The proof of concept includes a CLI, a web interface, and automated end-to-end scenarios for three credential types: employment history, professional certifications, and peer endorsements. The paper presents comparative results, developer experience findings, and discusses future extensions including selective disclosure.

A proof of concept for using AI agents as third-party verifiers in smart contract escrow arrangements. An AI oracle evaluates software deliverables against agreed-upon requirements — building, running, and testing them in Docker — then records the result on an Ethereum blockchain.

The smart contract uses a graduated autonomy model: high-confidence passing scores trigger automatic fund release, clear failures allow resubmission, and uncertain results are escalated to a human arbiter with a detailed verification report. The paper discusses the concept, architecture, limitations, and presents results from testing with intentionally varied deliverables.