In self sovereign identity systems based on verifiable claims, attributes are attested through signed claims on digital identifiers that the user control (e.g.

In self sovereign identity systems based on verifiable claims, attributes are attested through signed claims on digital identifiers that the user control (e.g. a public key). Blockchains here are the most effective mean to implement claim revocation: if someone who produced a claim wants to revoke it, he writes that on a blockchain.