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feat(approach): Private Supply Chain and Procurement - #216

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Darkjay123:approach-private-supply-chain
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Darkjay123 wants to merge 1 commit into
ethsystems:masterfrom
Darkjay123:approach-private-supply-chain

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Fills the "Approach TBD" gap on two use-case cards from issue #138: Private Supply Chain and Private Procurement, which share one approach.

What this adds

New approach card Private Supply Chain and Procurement (approaches/approach-private-supply-chain.md) comparing three sub-approaches:

  • Attested handoff chain (documented, I2I+I2U) — per-party attestations with minimal public payloads, encrypted off-chain detail, scoped disclosure to regulators.
  • Committed logistics data with compliance proofs (concept, I2I+I2U) — commit-and-prove against batch/invoice data; the verifier learns the claim, not the data.
  • Sealed procurement on shared rails (concept, I2I) — commit-and-reveal bids, contract-enforced phase timing, attested evaluation, milestone payments.

Each sub-approach carries CROPS scores with written justification. The card follows the v2 template (issue #151): scenario, requirements/constraints, per-sub-approach structure, the required 10-row comparison matrix, business/technical/legal perspectives, a conditional recommendation and open questions.

Accompanying changes

  • use-cases/private-supply-chain.md and use-cases/private-procurement.md: the "Approach TBD" recommended-approaches sections now link the card; the two use cases are cross-linked as related.
  • CHANGELOG.md: [Unreleased] entry in the style of the recent approach PRs (e.g. feat: add approach card for private institutional messaging #215).

Checks

Ran the repo's own validation locally where possible: all six required v2 sections present, title prefix and frontmatter fields complete, body word count within the documented approach limit. The Vale prose gate runs in CI.

Part of #138.

Fills the Approach TBD gap on private-supply-chain and private-procurement
(part of issue ethsystems#138). Adds the approach card comparing an attested handoff
chain, committed logistics data with compliance proofs and sealed
procurement on shared rails, links both use-case cards to it, and adds the
changelog entry.
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