YanoSec / Code
Three authored blobs. Shape is a hypothesis until the provenance card agrees.

Blob A: bGFi
Alphabet fits standard Base64. No padding is required because the source length is a multiple of three bytes.
Declared job: Base64 of a desk label.
Hand decode: 6c 61 62, UTF-8 letters lab.
Supported conclusion: the declared Base64 decode succeeds. Shape alone did not prove it.

Blob B: 6c6162
Alphabet fits hexadecimal. Two digits per byte gives three bytes.
Declared job: hex of the same desk label.
Hand decode: 6c 61 62, the same bytes as blob A.
Supported conclusion: the declared hex decode succeeds.

Blob C: cafe
Alphabet fits hexadecimal, and it is also four ordinary letters.
No declared encoding and no algorithm name.
Two hypotheses: the letters c a f e, or the two bytes ca fe.
Neither hypothesis is proved. A hex-looking string is not a hash by shape.