> For the complete documentation index, see [llms.txt](https://whitepaper.ethos.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.ethos.network/ethos-mechanisms/credibility-score.md).

# Credibility Score

**Credibility Scores** quantify credibility indicators.

### Calculation

The Credibility Score algorithm will factor in a variety of weighted indicators. Indicators include relevant on chain actions, such as:

* number of vouchers, mutual vouches, and amount vouched
* mutual vouch duration and defection
* credibility score of vouchers or reviewers
* average rating of your contributions on Ethos
* account ages of attestation

Weights do not need to be linear. For example, having 100 positive reviews may provide 2x more credibility than 10 positive reviews.

Indicators and weights may be added, removed, or adjusted as the scoring methodology evolves. The Ethos score is one interpretation of the underlying onchain data: the inputs are public and permissionless, and any third party can compute their own score from the same records.

#### Vouched value under $WHUF

With the transition to $WHUF vouching, the score contribution from vouched value uses a distribution-based model: it is determined by a voucher's standing among all vouchers, rather than by mapping staked value through a fixed curve. Whatever the token price does, relative positions are unaffected, so scores stay stable. The credibility signal comes from relative commitment, not absolute dollar value.

Scores carried through the transition intact: reviews, attestations, vouch history, slashing events, and every other input to the score persist, and existing ETH vouches continue to be considered in the score. See the $WHUF Token Whitepaper.

### Range

The range of the credibility score is currently 0 to 2800, with several different levels (subject to change)

<table><thead><tr><th width="191.7890625">Range</th><th>Description</th></tr></thead><tbody><tr><td>0 - 799</td><td>Untrusted</td></tr><tr><td>800 - 1199</td><td>Questionable</td></tr><tr><td>1200 - 1399</td><td>Neutral</td></tr><tr><td>1400 - 1599</td><td>Known</td></tr><tr><td>1600 - 1799</td><td>Established</td></tr><tr><td>1800 - 1999</td><td>Reputable</td></tr><tr><td>2000 - 2199</td><td>Exemplary</td></tr><tr><td>2200 - 2399</td><td>Distinguished</td></tr><tr><td>2400 - 2599</td><td>Revered</td></tr><tr><td>2600 - 2800</td><td>Renowned</td></tr></tbody></table>

All wallets and attestations start at the default 1200 score, "neutral."

### Usage

Credibility scores are intended as an "at a glance" quick estimate of credibility across many domains. No single number can represent the complexities of one's reputation among that many groups and interactions. The score is simply a summary of sentiment as measured by social proof.

Different communities' needs may warrant additional weights and calculations. Ethos open protocol allows other dApps to define alternate scores using the same onchain records.

### Under the hood

The credibility score will be calculated using a combination of onchain Ethos data and offchain observations like existing social graphs. Eventually, the algorithm will be committed to the Ethos Smart Contract, with all details publicly verifiable.