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tyleryasaka committed Sep 7, 2018
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The following is a digest of my paper [Measuring Trust](../supporting-files/measuring-trust.pdf).

## Introduction
## Abstract

> “I'm not reading a good review on Yelp.”
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The concept of an open and permissionless system is philosophically appealing. However, there are certain applications that require the concept of trusted identities. At a minimum, all systems that involve voting rely on unique, trustworthy identities to cast a vote. This includes any consensus mechanism as well as any rating system. Such systems face a dilemma: how can we filter out bad actors without a centralized authority?

Existing solutions seem to generally rely economic incentives. Bitcoin (and other systems based on proof-of-work), for example, makes influence in the network computationally expensive. Proof-of-stake, as an alternative, requires tokens to be staked in exchange for influence. In other words, these solutions are pay-to-play; Sybil attacks are no longer feasible because they are expensive.
In this paper, I propose the concept of deriving relative trust scores using a given trust metric, one score for each identity from the perspective of another, in a web of trust. I then offer as examples multiple trust metrics, propose the concept of relative reputation, and explore the the idea of obtaining social consensus from a web of trust using trust scores.


## Economic Sybil-resistance

Existing solutions to the Sybil problem seem to generally rely economic incentives. Bitcoin (and other systems based on proof-of-work), for example, makes influence in the network computationally expensive. Proof-of-stake, as an alternative, requires tokens to be staked in exchange for influence. In other words, these solutions are pay-to-play; Sybil attacks are no longer feasible because they are expensive.

However, I am interested in exploring an alternative to economic-based systems. There are a couple of reasons for this. The first is philosophical; pay-to-play systems inherently favor the economically privileged, and are less accessible to those with less economic resources. I believe that true decentralization should not discriminate based on economic privilege.

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The implementation of the function itself is left open for now. I will refer to a trust score generation algorithm as a trust metric (borrowing from Advogato’s terminology). This will allow us to discuss the concept of trust scores without being married to a particular implementation of them.

## A Definition of Sybil Resistance
## A Definition of Sybil-resistance

So far I have been using the term Sybil-resistance rather vaguely. Here I will provide a precise definition that applies to the manipulation of trust scores in a web of trust.

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