Ethereum Attestation Service (EAS)

The Ethereum Attestation Service (EAS) is an open, public infrastructure for creating attestations - signed, verifiable statements that something is true, recorded either on-chain or off-chain with an on-chain reference. Anyone can define a schema (the shape of a claim) and issue attestations against it, and anyone can verify them.

For real-world assets, EAS is useful because compliance depends on verifiable claims about people and assets. An attester - say a KYC provider - can attest that a given wallet belongs to a verified, eligible investor, and a token's contract or a KYC registry can check that attestation before allowing a transfer. This turns off-chain verification into an on-chain, reusable proof.

The advantage over a closed, custom system is interoperability: attestations follow a shared standard, so different applications can recognise and trust the same claim rather than each rebuilding identity from scratch. An investor verified once could, in principle, reuse that attestation across compatible platforms.

For an issuer, EAS is one building block for the identity and eligibility layer of a compliant token - a way to tie real-world verification to on-chain enforcement without inventing a proprietary format. For an investor, it is mostly invisible infrastructure, but it is part of how "only verified wallets can hold this token" becomes true in code. Attestations are only as trustworthy as the attester behind them, so who issues the claim still matters.