Distributed Reputation building in your control. Presented at BCHDEVCON AMS in Amsterdam on October 28th, 2018. Watch the video at 5:55 https://youtu.be/JVUSHZkBsq8?t=360

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