Standards & Specs

Bitstring Status List 2021

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What it is. The W3C Bitstring Status List (the renamed successor of Status List 2021) bitstring approach. Each issuer maintains one or more “status list credentials” that themselves are VCs whose subject is a gzipped, base64-encoded bitstring. Revoked credentials are marked by setting bit statusListIndex to 1.

IDA’s deviation from spec. The on-chain RevocationRegistry (§11.4) is complementary, not replacement, to Status List 2021. IDA dual-anchors revocation: bit set in the bitstring (off-chain primary) AND revokeCredential event on chain (primary audit trail). This is intentional non-conformance with strict Status List 2021 because the on-chain anchor gives verifiers a tamper-evident timestamp without trusting the issuer’s bitstring host.

Source: docs/verifiable-credentials/revocation.md ✅.