<p>Most likely, it's the number of unique addresses that hold a balance, not have appeared on the blockchain.</p>

CC BY-SA 3.0
2016-07-04T14:39:48.470Z
2016-07-04T14:39:48.470Z
Jimmy Song
<p>I believe it's the "number of unique bitcoin addresses used per day".</p>

<p>source: <a href="https://www.quandl.com/data/BCHAIN/NADDU-Bitcoin-Number-of-Unique-Bitcoin-Addresses-Used" rel="nofollow noreferrer">https://www.quandl.com/data/BCHAIN/NADDU-Bitcoin-Number-of-Unique-Bitcoin-Addresses-Used</a></p>

CC BY-SA 3.0
2017-11-01T01:11:52.877Z
2017-11-01T01:11:52.877Z
Alex Wilson
<p>As you already explained the number of unique addresses that were ever used in Bitcoin could only monotonically increase.</p>

<p>The description of the <a href="https://blockchain.info/charts/n-unique-addresses" rel="nofollow">Unique Addresses Chart</a> only says "The total number of unique addresses used on the Bitcoin blockchain.", while the German translation is just as ambiguous.</p>

<p>The "used" weakly implies that it is referring to the addresses that are <strong>currently in use</strong>, i.e. as Jimmy Song already said, it's likely to be the addresses that hold a balance.</p>

CC BY-SA 3.0
2016-07-04T15:40:26.087Z
2016-07-04T15:40:26.087Z
Murch
<p>Blockchain.info has various charts over time, including one for "unique addresses". They do not explain what it means, but presumably it is the number of unique addresses that appear in all transactions in the blockchain.</p>

<p>If this is true, then I would expect the number of unique addresses to keep going up indefinitely. How could the number of unique address decline?</p>

<address><blockchain.info>
How can the number of unique addresses decline?
Harry Pillsbury
# How can the number of unique addresses decline?

(Asked by: username_0 on 2016-07-04)

Blockchain.info has various charts over time, including one for "unique addresses". They do not explain what it means, but presumably it is the number of unique addresses that appear in all transactions in the blockchain.

If this is true, then I would expect the number of unique addresses to keep going up indefinitely. How could the number of unique address decline?

**Tags:** address, blockchain.info


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## 3 answers

### Answer by username_1 on 2016-07-04. Score: 2

Most likely, it's the number of unique addresses that hold a balance, not have appeared on the blockchain.


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### Answer by username_2 on 2017-11-01. Score: 2

I believe it's the "number of unique bitcoin addresses used per day".

source: <https://www.quandl.com/data/BCHAIN/NADDU-Bitcoin-Number-of-Unique-Bitcoin-Addresses-Used>


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### Answer by username_3 on 2016-07-04. Score: 1

As you already explained the number of unique addresses that were ever used in Bitcoin could only monotonically increase.

The description of the [Unique Addresses Chart](https://blockchain.info/charts/n-unique-addresses) only says "The total number of unique addresses used on the Bitcoin blockchain.", while the German translation is just as ambiguous.

The "used" weakly implies that it is referring to the addresses that are **currently in use**, i.e. as username_1 already said, it's likely to be the addresses that hold a balance.


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