Metadata stored in the clear alongside the ciphertext.
In format v2 the clear meta is intentionally minimal — only the fields the
reader needs before decryption are kept here (type, alg, iv,
single/chunked). Sensitive fields (mime, size, compressed,
chunkSize) live inside the encrypted payload and are surfaced only after
authentication.
Legacy v1 containers also carried mime/size/compressed/chunkSize in
this object; those fields remain optional so the reader can parse them when
decoding v1 blobs. They are never written by current writers.
Metadata stored in the clear alongside the ciphertext.
In format v2 the clear meta is intentionally minimal — only the fields the reader needs before decryption are kept here (
type,alg,iv,single/chunked). Sensitive fields (mime,size,compressed,chunkSize) live inside the encrypted payload and are surfaced only after authentication.Legacy v1 containers also carried
mime/size/compressed/chunkSizein this object; those fields remain optional so the reader can parse them when decoding v1 blobs. They are never written by current writers.