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Reputation Portability Protocol

Interoperability protocol — instantiates Reputational Signal Governance

Lets a subject carry reputation evidence or attestations from one context to another under consent, with scope and validity limits attached.

Reputation Portability Protocol is the export-and-import layer of the pipeline. It defines how reputation earned in one place can travel to another — as portable, signed attestations rather than raw history — while preserving three things: consent (the subject chooses to move it), scope (only the relevant claim travels), and validity limits (what the claim does and does not vouch for once it arrives). Its defining move is controlled transfer across a trust boundary with minimization built in: it moves the signal without dumping the subject's whole record or smuggling in context that doesn't survive the crossing. It produces none of the reputation itself; it only carries other mechanisms' outputs across a boundary.

Example

A driver with years of standing on one ride-hail platform wants credit for it when joining another. Instead of exporting every trip log, the protocol issues a scoped, signed attestation — "≥4.8 average over 3,000+ completed trips, no safety violations, verified 2024–2026" — that the receiving platform can cryptographically check without ever seeing an individual ride. The driver consents to share exactly that claim and nothing more; the trip-by-trip detail stays behind on the origin platform. Reputation crosses the boundary; the underlying personal data does not. The general principle is echoed in law, such as the data-portability right in regimes like the GDPR.[1]

How it works

What distinguishes it is moving verifiable claims, not raw records:

  • Package as attestations. Reputation is expressed as signed, verifiable claims (an issuer vouching for a scoped fact) rather than an export of the raw substrate.
  • Route through the subject. An issuer → holder → verifier flow puts consent at the holder, so the subject gates each transfer.
  • Minimize and bound. Share the claim, not the history behind it, and attach validity metadata — what it attests, freshness, revocation — so the receiver knows its limits.

Tuning parameters

  • Granularity of transfer — a single summary attestation or richer evidence. Coarser protects privacy but is easier to over-trust; richer carries more context and leaks more.
  • Consent model — per-transfer opt-in vs. standing authorization. Tighter consent respects autonomy at the cost of friction.
  • Verify vs. trust-the-issuer — cryptographic verification of the claim vs. accepting the origin's word. Verification resists forgery but needs shared standards.
  • Validity and revocation — how long a ported attestation stays good and how it is revoked. Short expiry keeps it fresh but forces re-issuance.
  • Context-translation strictness — how loudly the protocol warns that a claim earned in one setting may not mean the same in another (a great host is not a proven driver).

When it helps, and when it misleads

Its strength is that it breaks reputation lock-in: it lowers the cold-start barrier for a subject moving between platforms, reduces the power any single platform holds over a person's standing, and — through minimization — lets the signal move without the raw data trailing behind it.

It misleads mainly through context collapse: a claim valid in one setting is imported as if it means the same thing in another, and the receiver treats "trusted there" as "trusted here." Weak verification or revocation lets forged or stale attestations through, and even "minimized" claims can re-identify a subject when enough of them are combined. The classic misuse is laundering a bad record — porting only the flattering attestations into a fresh context to escape accountability elsewhere. The discipline is to carry scope and validity metadata with every claim, verify issuers, and insist that the receiving context re-weights the evidence rather than accepting it whole — the protocol supplies evidence, it does not dictate trust.

How it implements the components

  • portability_rule — defines what reputation may move, in what format (signed attestations), and through what issuer → holder → verifier flow.
  • privacy_and_data_minimization_boundary — enforces consent and minimization: the scoped claim travels, the underlying record stays put, and only what is relevant crosses the boundary.

It does NOT produce the reputation being ported — capture, verification, and scoring belong to Rating and Review System, Verified Transaction History, and Reputation Score or Standing Index — nor does it issue the credentials it forwards (Attested Credential Registry); it only moves their outputs across a trust boundary.

Notes

Portability shifts power from the platform to the subject, which is exactly why platforms tend to resist it — a person who can carry their standing away is a person the platform holds less tightly. And a ported signal is only as trustworthy as the receiving context's willingness to re-verify it: import without re-weighting turns portability into a channel for laundering reputation rather than carrying it honestly.

References

[1] Data portability — the principle, reflected in law such as the GDPR's Article 20 right, that a subject can obtain and transmit their own data from one service to another. Reputation portability extends the idea from raw personal data to scoped, verifiable claims about conduct, but inherits the same tension between mobility and re-identification. ↩