#449 - Decoded - Transaction Tokens with George Fletcher

George Fletcher joins Jeff Steadman and Sean O'Dell for a Decoded deep dive into transaction tokens (Txn-Tokens), the OAuth Working Group specification designed to secure requests as they move across microservices. George explains the problem transaction tokens solve: hop to hop security gaps, replayed access tokens, and the difficulty of tracking a single transaction across a graph of internal services. The conversation covers the anatomy of a transaction token, including the subject, audience, scope, and TXN claims, how a token's time to live should be scoped to the transaction itself, and why immutable parameters prevent tampering mid chain. George and Sean also explore how transaction tokens apply to AI agents and delegated authorization, referencing draft work on agent specific claims and cross domain trust. The episode closes with practical starting points for organizations of any size, including open source options and where to track the specification through the IETF OAuth Working Group.

Resources mentioned in this episode:

Transaction Tokens (base draft): https://www.ietf.org/archive/id/draft-ietf-oauth-transaction-tokens-11.html

Transaction Token Chaining Profile (Cross Domain Trust): https://www.ietf.org/archive/id/draft-fletcher-transaction-token-chaining-profile-02.html

Transaction Tokens for Agents: https://www.ietf.org/archive/id/draft-araut-oauth-transaction-tokens-for-agents-00.html

Tokenetes: https://tokenetes.io/

OAuth Working Group: https://github.com/oauth-wg

Decoded by Identity at the Center:

Jim McDonald: https://www.linkedin.com/in/jimmcdonaldpmp/

Jeff Steadman: https://www.linkedin.com/in/jeffsteadman/

Sean O'Dell: https://www.linkedin.com/in/seanodentity/

Visit the show on the web at http://idacpodcast.com

00:15 Introduction and catching up with Sean O'Dell

01:25 Introducing today's topic, transaction tokens and zero trust

02:26 George Fletcher joins the show

02:41 George's path into identity, from AOL to the Liberty Alliance

04:22 The problem that led to transaction tokens at Verizon Media

09:01 What a transaction token is, in plain terms

10:25 The specific problem transaction tokens solve

11:43 Transaction tokens versus a short lived access token

13:48 Delegated authorization, traceability, and the TXN claim

22:04 How long a transaction token should live

27:13 Local AI, vibe coding, and shrinking token lifetimes

28:45 What is inside a transaction token, the core claims

35:39 Call chains and the transaction context claim

39:05 Applying transaction tokens to AI agents

41:08 The transaction tokens for agents draft and the ACT claim

43:37 Getting started with limited resources, open source options

46:32 Scaling transaction tokens at a larger organization

50:38 What transaction token nirvana looks like

53:31 Whether this replaces a standard OAuth server

55:59 Where to learn more, the IETF OAuth Working Group

58:09 Cross domain trust and calling outside the enterprise

1:01:38 Alternatives to transaction tokens and adoption incentives

1:05:16 George's summary of the conversation

1:07:26 Sean's closing thoughts and takeaways

1:09:19 Wrap up and close

IDAC, Identity at the Center, Jeff Steadman, Jim McDonald, Sean O'Dell, George Fletcher, Practical Identity, transaction tokens, Txn-Token, OAuth, OAuth Working Group, zero trust, microservices, access tokens, JWT, authorization, delegated authorization, agentic identity, AI agents, call chain, token exchange, TXN claim, scope claim, Verizon Media, IETF, Keycloak, Tokenetties, cross domain trust, Decoded