Implemented on top of the audited @scure/base codec (A3). Throws a
generic Error on inputs with characters outside the URL-safe
alphabet or an impossible length — token parsers wrap this call and
translate failures into AttestationErrorMALFORMED/FORMAT.
Decodes a URL-safe Base64 string to a Uint8Array.
Implemented on top of the audited
@scure/basecodec (A3). Throws a genericErroron inputs with characters outside the URL-safe alphabet or an impossible length — token parsers wrap this call and translate failures intoAttestationErrorMALFORMED/FORMAT.