# Building a Sybil-Resistant Future Using Gitcoin Passport Onchain Stamps The fragmented digital identity landscape creates barriers for users and developers in building trust and interoperability between identity and credentialing solutions. The article introduces Gitcoin Passport Onchain Stamps built using the Ethereum Attestation Service (EAS) to enable users to add their stamps to the Ethereum ecosystem. Initially, Onchain Stamps will be available on OP Mainnet, with plans to extend Gitcoin Passport to other EVM-compatible chains. With interoperable attestations, projects can select relevant attestations for Sybil resistance and authorizations, advancing the vision of a more interconnected and secure digital identity landscape. Refer to the links at the end of the article to access a tutorial or to get help from the team on using Gitcoin Passport Onchain Stamps in your application. Access the complete article on the [Gitcoin Blog](https://www.gitcoin.co/blog/gitcoin-passport-onchain-stamps)