openid / openid/OpenID4VCI

Ambiguity in `batch_size`: maximum number of keys or proofs array size?

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Description

Section 12.2.4-2.9.1 of OpenID4VCI
states:

batch_size: REQUIRED. Integer value specifying the maximum array size for the proofs parameter in a Credential Request. It MUST be 2 or greater.

Considering appendices F and D, which allow key attestations with multiple keys provided within a single JWT, batch_size should arguably define the maximum number of keys, and not the size of the proofs array.

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Research direction

Read section 12.2.4-2.9.1 of OpenID4VCI together with appendices F and D, focusing on how batch_size relates to proofs and keys. Compare the two interpretations and review the surrounding terminology. Done means the ambiguity is resolved with an agreed interpretation and corresponding specification wording.

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Assessment

Domain
documentation
Issue type
Documentation
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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