NutFeder
NutFeder is an open standard and software ecosystem for federated identity and access management. It defines a decentralized framework to establish cross-domain trust, issue verifiable attestations, and enable single sign-on among participating organizations. Attestations are cryptographically signed tokens (Nut attestations) carrying minimal attributes and revocation.
NutFeder uses NutRefs, decentralized registries storing domain metadata, trust relations, and consent policies. Validators sign attestations;
The protocol interoperates with OAuth 2.0, OpenID Connect, and SAML through adapters while maintaining its own
The project began in the early 2020s via collaboration of researchers and open-source developers; a public
Governance is handled by the NutFeder Consortium, a nonprofit that oversees the standard, security advisories, and
See also: SAML, OpenID Connect, OAuth 2.0, Decentralized identifiers.