Anonymous credentials / DID

Coconut: Threshold Issuance Selective Disclosure Credentials with Applications to Distributed Ledgers

Decode

An implementation proposal for a Self Sovereign Identity (SSI) network using Blockchain as a DKPI

Identity Containers

Self Sovereing ID On Substrate

Anti-Sibel protections - Any identity scheme must start with a rerandomizable certificate to prevent identities being link across domains, but individual domains might reasonably want only one unique identity for their domain. There are likely a few ways to do this, well certainly proof-of-personhood parties do this, but the tricks could be adapted to a centralized model, not using ring signatures.

Age over 18 - This is a rerandomizable certificate with a single feature, or maybe no features. It'd likely be implemented with blind signatures or OPRFs to enforce expiry, which makes it even more trivial. Afaik, any more specific permissions, like say a doctor's prescription, comes with strong expiry requirements that make blind signatures or OPRFs the only option.

The Path to Self-Sovereign Identity

Decentralized Identifiers (DIDs) v0.12

Verifiable Credentials Data Model 1.0

Introduction to DID Auth

ZKProof Standards Applications Track Proceedings

Decentralized, Self-Sovereign, and Blockchain Identity resources

A decentralized self sovereign identity solution developed by Jolocom.

Self Sovereign Identity — a guide to privacy for your digital identity with Blockchain

anonymous credentials

Aggregating CL-Signatures Revisited: Extended Functionality and Better Efficiency

hyperledger fabric

MSP Implementation with Identity Mixer

Concepts and Languages for Privacy-Preserving Attribute-Based Authentication

Sovrin: digital identities in the blockchain era

A First Look at Identity Management Schemes on the Blockchain