Attestation (On-Chain)

An attestation is a signed statement that some fact is true, made by a party willing to stand behind it. In real-world-asset work it shows up in two places: confirming that reserves back a token, and confirming that a person or wallet meets a requirement.

The first kind is an accounting attestation. An independent firm inspects an issuer's holdings and signs a report - this is the mechanism behind most proof of reserves. It is an off-chain document whose result is often published or referenced on-chain.

The second kind is an on-chain attestation: a cryptographically signed record written to a blockchain that says, for example, "this wallet passed KYC" or "this address is an accredited investor." Systems like the Ethereum Attestation Service let a trusted issuer sign such a claim once, so a token contract or app can check it directly instead of re-collecting documents. This keeps sensitive personal data off-chain while putting the verdict on-chain where code can use it.

Attestations are how the off-chain world tells the on-chain world what is true. They let a smart contract act on facts it cannot observe itself - whether reserves are full, or whether a buyer is allowed to hold a security token.

The value of any attestation depends entirely on who signed it and what, exactly, they certified. An attestation from an unknown party, or one that quietly certifies less than it appears to, is worth little.

Source: rwa.xyz, as of 2026.