> For the complete documentation index, see [llms.txt](https://standard-crypto.gitbook.io/zkstats/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://standard-crypto.gitbook.io/zkstats/projects/world.md).

# World

### Overview

World (formerly Worldcoin) is a decentralized identity and financial network designed to provide a unique digital identity through iris-scanning technology. This digital ID, World ID authenticates "proof of humanness" by using ZK proofs to ensure privacy and security, allowing users to verify their identity without revealing personal information. The data collected is from the Semaphore Merkle Tree Batcher, which adds and deletes users from the Identity manager. The World Dune query can be found [here](https://dune.com/queries/4149850).

### Query Structure

The query filters transactions sent to the WorldIDIdentityManager [contract](https://etherscan.io/address/0xf7134ce138832c1456f2a91d64621ee90c2bddea) that invoke verifyProof or verifyCompressedProof on one of the verifier contracts.

### Verifier Contracts

* [Size 100 Register Verifier](https://etherscan.io/address/0xb5f23A0c92F2f4aeE506FA3B1Cc2813820d13258)
* [Size 600 Register Verifier](https://etherscan.io/address/0xFC1c26E964F791f81a33F49D91f79456891AA1c1)
* [Size 1200 Register Verifier](https://etherscan.io/address/0xE44c83b9e1971A24EC698829297A0C4026B0CeF9)
* [Size 10 Delete Verifier](https://etherscan.io/address/0xCA7d6822b9c6913B1A1416cE30eF14c4e7f0bFb1)
* [Size 100 Delete Verifier](https://etherscan.io/address/0x43B68ccBa7FC726540768fD1537c3179283140ed)

### Calculations

* The proof volume is the number of traces that invoke verifyProof or verifyCompressedProof on one of the verifier contracts
* The cost is calculated using the following formula: 
  * $$\text{cost} = \sum\_{\text{traces}} \left( \text{gas\_used} \times \text{gas\_price} \times \text{eth\_price} \right)$$
  * Where:
    * $$\text{gas\_used}$$ is the amount of gas consumed by a trace in one of the verifiers
    * $$\text{gas\_price}$$ is the price of gas on the day of the transaction
    * $$\text{eth\_price}$$ is the average price of ETH in USD on the day of the transaction


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