Sovereign Policy Token Transactions: A Framework for Policy-Bound, Tamper-Evident Authorization Across Trust Boundaries

Abstract

The SPT-Txn Framework v6.0 integrates Attribute-Based Access Control (ABAC), Token-Based Access Control (TBAC), Non-Fungible Tokens (NFTs), Self-Sovereign Identity (SSI), Zero-Knowledge Decentralized Identifiers (zkDID), biometric uniqueness proofs, and IETF Transaction Tokens into a unified authorization architecture for the agentic economy. This working paper is developed in conjunction with IETF Internet-Draft draft-coetzee-oauth-spt-txn-tokens-00, available at https://datatracker.ietf.org/doc/draft-coetzee-oauth-spt-txn-tokens/