Attestation Hub

Welcome to the OLI Attestation Hub, where you can assign tags to blockchain addresses and smart contracts to improve transparency and discoverability.

Single Address Attestation

Assign tags to an individual blockchain address or smart contract.

One address at a time
Multiple tags per address
Quick and simple interface

Go to single attestation

CSV Upload

Upload a CSV file with multiple addresses to attest at once.

Up to 50 attestations at once
Easy upload through UI
Perfect for analysts and projects

Go to CSV upload

Bulk Attestation Scripts

Use our scripts for large-scale attestation needs.

50+ attestations support
Python & TypeScript options
Pipeline integration ready

Explore scripts

Discover & Attest

Browse high-value unlabeled contracts to attest.

Curated high-impact contracts
Prioritized by transaction volume
Ideal for community contributors

Explore contracts

What is an attestation?

Attestations are onchain verifiable statements that assign specific tags or properties to blockchain addresses. By providing attestations, you help create a more transparent blockchain ecosystem where addresses can be identified by their purpose, ownership, or other relevant properties.

Single Address Attestation

Use this form to attest a single blockchain address. You can add multiple tags to the same address.

Chain

The chain that the contract is deployed on.

Address

Contract Name

This tag refers to the fundamental descriptor that provides a clear and immediate understanding of an address's purpose or role. It should offer a straightforward one-word detailed definition into the functionality of the address. For example, the Uniswap router contract would have the contract_name = 'router'.

Owner Project

The project that owns the contract or eoa. Link to project registry https://github.com/opensource-observer/oss-directory.

Usage Category

The category of usage for the contract.

Bulk Address Attestation via CSV

Upload a CSV file with multiple addresses to create attestations in bulk. Limited to 50 addresses per upload.

Bulk Attestation

Enter multiple addresses and their associated tags for bulk attestation. All attestations will be submitted in a single transaction, saving gas and time.

Note: Using the multiAttest feature requires only one signature for all attestations, making the process more efficient. Maximum of 50 attestations allowed per batch.

Chain *	Address *	Contract Name	Owner Project	Usage Category	Is Contract	Actions

Bulk Attestation Scripts

Use our scripts for large-scale attestation needs.

Bulk Attestation Scripts

For handling larger datasets or integrating with your data pipeline, we provide several script options. Choose the one that best fits your use case and technical requirements.

Bulk Onchain Python

For Python developers with onchain needs

Submit thousands of attestations onchain
Fully verifiable onchain data
Gas fees required for each transaction

Access script

Bulk Offchain Python

For Python developers with gas-free needs

Create unlimited attestations with no gas fees
Perfect for large-scale data pipelines
Easily integrate with Python-based workflows

Access script

Bulk Offchain TypeScript

For TypeScript/JavaScript developers

Zero gas fees for all attestations
Ideal for web applications and Node.js
TypeScript types for enhanced developer experience

Access script

When to use bulk scripts?

These scripts are ideal when you need to submit more than 50 attestations or want to integrate attestation into your existing data pipeline. Choose onchain for maximum verifiability or offchain for gas-free operation.

View documentation