# AER-1 Draft Proposes a Portable Receipt for AI Tool Calls By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/44432 Published: 2026-10-30T08:44:05.000Z Updated: 2026-10-30T08:44:05.000Z Section: Technology > The Oct. 22 revision covers one tool call; a Visa, BILL and Billtrust pilot is processing buyer-approved invoice payments. The proposals have not established a shared standard. An Oct. 22 revision of AER-1 proposes a portable record for one AI-agent tool call, as a Visa, BILL and Billtrust pilot processes buyer-approved business invoice payments. The proposed record would capture execution time, details about the tool and caller scope, provenance, and a cryptographic commitment to the output. It also outlines optional ways to anchor a record’s digest, including Nostr, Bitcoin (BTC), a SCITT transparency service and a timestamp authority. An anchor can show that a digest existed by a particular time. A signature and hash can help verify that a record was issued and has not changed, but they do not establish that the recorded inputs were true, that the agent had valid authority or that the action took place in the real world. Two other individual drafts describe related records with different scopes. Tora Toraman’s SCITT profile, last updated Aug. 14, proposes a signed, hash-chained record of an agent action that could be registered with a transparency service. Steven Mih’s “Agent Action Capsule,” last updated Sept. 26, proposes a digest-committed record that can indicate whether an action was executed, blocked, denied, errored or timed out. The Capsule is an individual submission intended for discussion in the SCITT Working Group. An Internet-Draft has no formal standing unless a working group adopts it or it is approved as an RFC. AER-1, the SCITT profile and the Capsule remain individual proposals; none establishes an adopted common receipt standard. They describe possible record formats rather than a shared schema for companies using different systems. Visa, BILL and Billtrust announced Oct. 20 that their [live payment pilot]() was processing end-to-end transactions with participating buyers and suppliers. It uses buyer-approved payment instructions and tokenized credentials, with Billtrust authenticating agents at supplier portals. The announcement specified no transaction count or dollar volume, portable receipt format or blockchain anchor. Mark Nelsen, Visa senior vice president and head of product for Commercial & Money Movement Solutions, said, “Businesses should not have to choose between automation and control when making payments.” The pilot is processing payments, while the drafts outline ways to record agent actions. The pilot and the draft proposals do not establish a common receipt format for recording agent actions across systems. ## Links in this article - [live payment pilot](https://www.tokenpost.com/news/business/36124)