With substr (), it's possible to split a BLOB, like:

SELECT quote (substr (X'1337cafe', 3, 2));
  => X'CAFE'

        However, how do I concatenate two blobs?

        Unfortunately, the string concatenation operator, when applied
        to two BLOB's, results in a text string instead of a BLOB, like:

SELECT quote (X'5445' || X'5354');
  => 'TEST'

-- 
FSF associate member #7257

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