<p>It's short for "transaction". There is a list here of rules that individual transactions must follow:</p>

<p><a href="https://en.bitcoin.it/wiki/Protocol_rules#.22tx.22_messages" rel="nofollow noreferrer">https://en.bitcoin.it/wiki/Protocol_rules#.22tx.22_messages</a></p>

<p>Some reasons that a transaction could be invalid are:</p>

<p>-The person trying to spend bitcoin doesn't have that much bitcoin.</p>

<p>-The person trying to spend bitcoin already submitted another transaction trying to spend the same bitcoin.</p>

<p>-The person trying to spend bitcoin can't prove that they are the owner of the bitcoin.</p>

<p>In addition, the block as whole that the transaction is in must follow these rules: <a href="https://en.bitcoin.it/wiki/Protocol_rules#.22block.22_messages" rel="nofollow noreferrer">https://en.bitcoin.it/wiki/Protocol_rules#.22block.22_messages</a></p>

CC BY-SA 4.0
2019-06-19T15:00:38.857Z
2019-06-19T15:00:38.857Z
Acccumulation
<p>"txn" is short for "transaction".  The abbreviation "tx" is also often used.</p>

<p>For an explanation of what makes a transaction (in)valid, see the links at <a href="https://bitcoin.stackexchange.com/questions/2425/how-to-know-if-a-transaction-is-valid">How to know if a transaction is valid?</a></p>

CC BY-SA 4.0
2019-06-19T06:12:08.497Z
2019-06-19T06:12:08.497Z
Nate Eldredge
<p>I read this in a IRC exchange:</p>

<blockquote>
  <p>verifies your txns against a random node that you don't control. if for some reason that node went rogue, you might have accepted an invalid txn</p>
</blockquote>

<p>What is a txn? </p>

<transactions><nodes><terminology>
What is a txn? How can it be invalid?
Anon
# What is a txn? How can it be invalid?

(Asked by: username_0 on 2019-06-19)

I read this in a IRC exchange:

> verifies your txns against a random node that you don't control. if for some reason that node went rogue, you might have accepted an invalid txn

What is a txn?

**Tags:** transactions, nodes, terminology


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## 2 answers

### Answer by username_1 on 2019-06-19. Score: 1 | Accepted answer

It's short for "transaction". There is a list here of rules that individual transactions must follow:

<https://en.bitcoin.it/wiki/Protocol_rules#.22tx.22_messages>

Some reasons that a transaction could be invalid are:

-The person trying to spend bitcoin doesn't have that much bitcoin.

-The person trying to spend bitcoin already submitted another transaction trying to spend the same bitcoin.

-The person trying to spend bitcoin can't prove that they are the owner of the bitcoin.

In addition, the block as whole that the transaction is in must follow these rules: <https://en.bitcoin.it/wiki/Protocol_rules#.22block.22_messages>


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### Answer by username_2 on 2019-06-19. Score: 5

"txn" is short for "transaction". The abbreviation "tx" is also often used.

For an explanation of what makes a transaction (in)valid, see the links at [How to know if a transaction is valid?](https://bitcoin.stackexchange.com/questions/2425/how-to-know-if-a-transaction-is-valid)


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