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# Flexible Transcript
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Flexible Transcript is a crate offering:
- `Transcript` , a trait offering functions transcripts should implement.
- `DigestTranscript` , a competent transcript format instantiated against a
provided hash function.
- `MerlinTranscript` , a wrapper of `merlin` into the trait (available via the
`merlin` feature).
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- `RecommendedTranscript` , a transcript recommended for usage in applications.
Currently, this is `DigestTranscript<Blake2b512>` (available via the
`recommended` feature).
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The trait was created while working on an IETF draft which defined an incredibly
simple transcript format. Extensions of the protocol would quickly require a
more competent format, yet implementing the one specified was mandatory to meet
the specification. Accordingly, the library implementing the draft defined an
`IetfTranscript` , dropping labels and not allowing successive challenges, yet
thanks to the trait, allowed protocols building on top to provide their own
transcript format as needed.
`DigestTranscript` takes in any hash function implementing `Digest` , offering a
secure transcript format around it. All items are prefixed by a flag, denoting
their type, and their length.
`MerlinTranscript` was used to justify the API, and if any issues existed with
`DigestTranscript` , enable a fallback. It was also meant as a way to be
compatible with existing Rust projects using `merlin` .
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This library was
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[audited by Cypher Stack in March 2023 ](https://github.com/serai-dex/serai/raw/e1bb2c191b7123fd260d008e31656d090d559d21/audits/Cypher%20Stack%20crypto%20March%202023/Audit.pdf ),
culminating in commit
[669d2dbffc1dafb82a09d9419ea182667115df06 ](https://github.com/serai-dex/serai/tree/669d2dbffc1dafb82a09d9419ea182667115df06 ).
Any subsequent changes have not undergone auditing.
