Cryptic crossword clue
How one checked authenticity of old money, then some new 7

The most common and most likely answer to this crossword clue is the 7 letter word BITCOIN

B
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T
C
O
I
N

Buddy explains!

The straight part
We know that "some new" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some new = bitcoin.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does BITCOIN mean?

BITCOIN noun
  1. A unit of the bitcoin digital currency.
BITCOIN proper noun
  1. A decentralized digital currency.

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