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BlockREP
Distributed Reputation building
BCH Hackathon Amsterdam
October 28th
, 2018
Sander den Hartog and Jelle Haandrikman
2
Introduction

Trust and Reputation is of paramount importance in
relationships, trade and commerce

Currently, our reputations are silo-ed within centralized
platforms1
and we are at their mercy

There is a risk that governments develop a “National
Social Credit Score” similar to Chinese State
 Citizens’ economic and social reputation is tracked
 Inputs: Income tax, Adherence , traffic rules, criminal record, shopping
habits, CCTV Cameras
 These Social Credit Scores determine eligibility for travel, internet
access, loans

Blockchain offers us a toolkit to pre-empt this and
making users self-sovereign
1
For example: AirBNB, Uber, Ebay, Reddit, Facebook
3
Solution
AirBNB
Renter
Insurance
Oracle
AirBNB
Host
Family
Friends
Self
Commercial
Insurance
Vage kennis/
acquaintance
Etcetera
Premium Rent
Prem
ium
1: Lock amount
2: Pay Premium or
3: Collateral 1000 EUR
1: Lock amount cmd.
2: Consensus: Unlock and
send Premium or
3: No Consensus -->
go to Escalation Oracle
Escalation
Oracle
Choose from:
- Independent reporter
- 2 out of 3 reporters
- go to court
Collateral
Prem
ium
Rent
Reputation
Contract
Deploy
Smaller Collateral
sm
allcollateral
Independent
Reporter
Reputation
Contract
Deploy
4
Further Development: UpVotes
 Reputation also encompasses interactions that do not require a
financial guarantee: Uber Reviews, Reddit Karma/Gold,
 These interactions could use symbolic micropayments
 E.g. one upvote / positive review costs 1 cent
 Enriched depth and breadth of BlockREP through higher frequency
data
 This also ensures accessibility for all
 Build a reputation without financial Backers
5
Adoption
 Challenging to drive adoption, currently:
 No Users
 No Counterparties
 No Oracles
 A party like Yours.Org could catalyse adoption
 Yours.Org currently has its own reputation system
 This could be opened up to the community
 As Yours.org gains more adoption, it becomes more attractive
for the ecosystem to utilize BlockREP and establish itself as
the standard for Reputation
6
Appendix: Solution
 Users can create a “Reputation Contract” financially backed by “Supporters”
 Counterparties (e.g. AirBNB) can assess risk analyzing track-record of
Reputation Contract (using BlockExplorer/3rd party)
 Time
 # transactions
 # defaults
 Loss distribution
 Comments in memo field (if not shielded by user)
 Counterparties can reduce risk by locking Collateral and paying insurance
premium
 Users have Freedom:
 Can create multiple, segregated identities (e.g. AirBNB / SilkRoad /
LocalBitcoins)
 Start new Reputation
 Shield transactions using zeroknowledge proofs

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BlockREP

  • 1. BlockREP Distributed Reputation building BCH Hackathon Amsterdam October 28th , 2018 Sander den Hartog and Jelle Haandrikman
  • 2. 2 Introduction  Trust and Reputation is of paramount importance in relationships, trade and commerce  Currently, our reputations are silo-ed within centralized platforms1 and we are at their mercy  There is a risk that governments develop a “National Social Credit Score” similar to Chinese State  Citizens’ economic and social reputation is tracked  Inputs: Income tax, Adherence , traffic rules, criminal record, shopping habits, CCTV Cameras  These Social Credit Scores determine eligibility for travel, internet access, loans  Blockchain offers us a toolkit to pre-empt this and making users self-sovereign 1 For example: AirBNB, Uber, Ebay, Reddit, Facebook
  • 3. 3 Solution AirBNB Renter Insurance Oracle AirBNB Host Family Friends Self Commercial Insurance Vage kennis/ acquaintance Etcetera Premium Rent Prem ium 1: Lock amount 2: Pay Premium or 3: Collateral 1000 EUR 1: Lock amount cmd. 2: Consensus: Unlock and send Premium or 3: No Consensus --> go to Escalation Oracle Escalation Oracle Choose from: - Independent reporter - 2 out of 3 reporters - go to court Collateral Prem ium Rent Reputation Contract Deploy Smaller Collateral sm allcollateral Independent Reporter Reputation Contract Deploy
  • 4. 4 Further Development: UpVotes  Reputation also encompasses interactions that do not require a financial guarantee: Uber Reviews, Reddit Karma/Gold,  These interactions could use symbolic micropayments  E.g. one upvote / positive review costs 1 cent  Enriched depth and breadth of BlockREP through higher frequency data  This also ensures accessibility for all  Build a reputation without financial Backers
  • 5. 5 Adoption  Challenging to drive adoption, currently:  No Users  No Counterparties  No Oracles  A party like Yours.Org could catalyse adoption  Yours.Org currently has its own reputation system  This could be opened up to the community  As Yours.org gains more adoption, it becomes more attractive for the ecosystem to utilize BlockREP and establish itself as the standard for Reputation
  • 6. 6 Appendix: Solution  Users can create a “Reputation Contract” financially backed by “Supporters”  Counterparties (e.g. AirBNB) can assess risk analyzing track-record of Reputation Contract (using BlockExplorer/3rd party)  Time  # transactions  # defaults  Loss distribution  Comments in memo field (if not shielded by user)  Counterparties can reduce risk by locking Collateral and paying insurance premium  Users have Freedom:  Can create multiple, segregated identities (e.g. AirBNB / SilkRoad / LocalBitcoins)  Start new Reputation  Shield transactions using zeroknowledge proofs