R
REPUTRANS
Cross-Platform Reputation Portability
for the Trust Economy
Anonymous · Decentralised · Privacy-Native
Hackathon Demo | 2026
Reputation was meant to be portable since antiquity
Ancient philosophers saw the transcendental and unbound nature of reputation
Aristotle (384–322 BC)
Nicomachean Ethics identified reputation (doxa) as earned through consistent virtue across contexts — not confined to one city or role. A person's good name followed them from Athens to Corinth.
Plato (428–348 BC)
The Republic considered reputation as a soul's essence — independent of body and place. Justice derives from knowing who a person truly is beneath surfaces. The self is portable because it is fundamentally non-material.
15 years of broken promises
The cold-start problem has plagued the “walled gardens” of sharing economy since day one
2011
Airbnb launches reputation silo
Guest & host ratings locked in. A 5-star Uber driver starts at zero on Lyft — the cold-start tax begins.
2014
Trust & Safety Alliance attempt
Platforms discuss cross-platform ID; talks collapse under competitive data-hoarding instincts.
2016
Sharing Economy UK report
Parliament flags cold-start risk and insurance data gap for gig workers — no solution found.
2018
GDPR tries to force data portability
Art. 20 grants individuals the right to export data, but platforms stonewall meaningful reputation transfer.
2021
EU Data Governance Act
Proposes data spaces; reputation portability still excluded from implementation scope.
2023
Gig economy insurance gap
Uber/Lyft/Bolt drivers pay 30–80% more for personal car insurance despite provable safety records on-platform.
The cold-start tax & the insurance gap
40%
drop in bookings
for new gig workers
due to zero reputation
£800+
annual insurance
premium overpay by
UK Uber drivers
0
cross-platform rating
exports supported
by major platforms
Platform silos prevent reputation from flowing where it's needed:
Uber Rating
Airbnb Score
Deliveroo Stars
→ Insurance
→ New Platform
Reputrans: how it works
Three cutting-edge cryptographic papers → one working prototype
Sharing Economy
Platform
Uber, Airbnb,
Deliveroo…
Anonymous
Self-Credential
Paper 1:
Anonymous Self-Credentials
Distributed
Threshold Key
Paper 2:
Thetacrypt
ZK Proof
(Constraint-Efficient)
Paper 3:
Map-to-Curve Relations
Insurer / New
Platform
Gets ZK proof,
NOT identity!
1. Anonymous Self-Credentials & SSO
ePrint 2025/618
Enables users to prove attributes (e.g., rating ≥ 4.7) without revealing their identity. Self-issuable: no central authority holds the credential. Unlinkable across verifiers — the insurer cannot correlate different proof requests. Sybil-resistant as well.
2. Thetacrypt: Distributed Threshold Cryptography
arXiv 2502.03247
No single node holds the signing key. Threshold schemes ensure credential issuance even if some nodes are compromised. Modular, blockchain-agnostic — drops into any distributed backend.
3. Constraint-Friendly Map-to-Curve Relations
ePrint 2025/1503
Dramatically reduces proving cost for elliptic-curve operations inside ZK circuits. Enables efficient on-device proof generation — critical for mobile Uber drivers.
ZK insurance quotes: the killer use case
An Uber driver proves rating & the number of safe trips — without revealing who they are
1
Driver requests credential
Uber platform signs the driver's rating attributes using Thetacrypt threshold keys — no single party sees the raw data.
2
ZK proof generated on-device
Using Groth et al.'s efficient curve relations, the driver's phone produces a compact proof: 'rating > 4.5, trips > 1000, accident_rate = 0'.
3
Anonymous presentation
Self-credential lets the driver present the proof to Admiral/AXA without revealing their name, platform account, or location history.
4
Insurer verifies & quotes
Insurer verifies the cryptographic proof in milliseconds. No PII changes hands. GDPR fully satisfied. Premium drops by up to 35%.
Result: first privacy-preserving insurance underwriting layer for the gig economy.
Product Demo – step 1
2
Product Demo – step 2
2
Product Demo – step 3
2
Product Demo – step 4
2
Product Demo – step 5
2
Privacy By Design — Built for Global Regulation
GDPR (EU)
Art. 5, 17, 20, 25
✓ Data minimisation: insurer receives a ZK proof, never raw personal data
✓ Right to erasure: no PII stored — nothing to delete
✓ Portability (Art. 20): ZK credential is inherently portable by design
✓ Privacy by Default (Art. 25): anonymity is the baseline, not an option
CCPA / CPRA (California)
§1798.100–199
✓ No 'sale' of personal information — ZK proofs contain no personal data
✓ Right to know: user controls exactly which attributes are disclosed
✓ Opt-out: user never loses custody of their credential
UK GDPR + Data Protection Act 2018
ICO guidance
✓ UK GDPR mirrors EU requirements post-Brexit
✓ ICO sandbox-friendly: privacy-enhancing technology explicitly encouraged
✓ FCA RegTech: ZK proofs qualify as privacy-enhancing for AML/KYC exemption research
A multi-billion market opportunity
Global Sharing Economy
$1.5T
2030 est.
Airbnb, Uber, Deliveroo, TaskRabbit — all generating reputational data with zero portability
Gig Worker Insurance
$74B
2028 est.
200M+ gig workers globally massively over-paying for coverage due to the lack of meaningful data points
Digital Identity Market
$49B
2026 est.
SSI, eIDAS 2.0, and wallet infrastructure driving enterprise adoption of portable identity
Reputrans TAM
$8.2B
Credential issuance fees + insurance data licensing + API access across verticals
Go-to-Market Strategy
Phase 1
Pilot
(0–12 mo)
→ Partner with 1 InsurTech (e.g., By Miles, Zego)
→ 100 Uber/Lyft drivers in London & SF
→ Prove 15–30% premium reduction
→ API: platform → insurer pipeline
Phase 2
Scale
(12–24 mo)
→ Expand to Airbnb, Deliveroo, TaskRabbit
→ White-label SDK for platforms
→ FCA Regulatory Sandbox entry
→ 5 insurer integrations
Phase 3
Platform
(24–48 mo)
→ Open credential standard (W3C VC compatible)
→ Cross-border EU Digital Identity Wallet
→ Marketplace for reputation data licensing
→ Series A fundraise
Revenue: Credential issuance fee · Anonymized data for insurers · Platform licensing · White-label SDK
Why Now?
⚖️
eIDAS 2.0 Live by 2026
EU mandates digital identity wallets — creates the infrastructure rails we ride.
🔐
ZK Proofs Now Practical
Groth et al.'s 2025 breakthrough makes on-device proving viable for the first time.
🚗
Gig Economy at Peak Pain
200M+ gig workers, rising insurance costs, post-COVID platform expansion.
🏦
Insurers Hungry for Data
Telematics saturation pushing insurers to seek new behavioural risk signals and data points.
🌍
GDPR Maturity
5+ years of GDPR enforcement means enterprises now budget for compliance tools.
🔗
Decentralised Trust Moment
Post-FTX, distributed trust architectures win by default over centralised custodians.
Team
2
R
R
REPUTRANS
Your reputation is yours.
Take it everywhere.
We've built the first working prototype of privacy-preserving,
cross-platform reputation portability — powered by cutting-edge ZK cryptography.
kirill@reputrans.com