Data Item: array
Semantics: ZeWIF (Zcash Wallet Interchange Format) document; the tag
           encloses a two-element array [version, payload] whose payload
           is a CBOR map conforming to the version's ZeWIF schema. In a
           stored document this tag is enclosed in tag 55799 (Self-Described CBOR).
Contact: Kris Nuttycombe <kris&zodl.com>
Description of semantics (URL):  ZeWIF: Zcash Wallet Interchange Format, https://github.com/zcash/zewif