user93684: i am using electrum. First, I had a bitcoin address and I used it once to receive BTCs and then it changed. but new address is invalid.
i tired so many times. i checked all the options. but it was not OK.
what shall i do?
thank you

user13866: TL;DR: select Show Addresses item from the View menu. Then click the Addresses tab.


First, I had a bitcoin address ...

A Hierarchical Deterministic (HD) wallet has many addresses.

... and I used it once to receive BTCs and then it changed.

That is normal, for privacy reasons, an HD wallet will generate a new receive address for each transaction in which you will receive BTCs.

I can't find my bitcoin address

Look under the "Addresses" tab

(from a beginners guide)

It will be hidden by default. To reveal it, select Show Addresses item from the View menu. 



i checked according awebanalysis.com/en/bitcoin-address-validate 

I don't know that site but maybe you mis-typed an address or that site doesn't know about the type of address your wallet is using. Some online sites are not up-to-date with the latest Bitcoin features (e.g. Bech32 type addresses that start bc1...). Try another, for example http://lenschulwitz.com/base58

93684: <p>i am using electrum. First, I had a bitcoin address and I used it once to receive BTCs and then it changed. but new address is invalid.
i tired so many times. i checked all the options. but it was not OK.
what shall i do?
thank you</p>
 13866: <p>TL;DR: select <code>Show Addresses</code> item from the <code>View</code> menu. Then click the <code>Addresses</code> tab.</p>

<hr>

<blockquote>
  <p><strong>First, I had a bitcoin address ...</strong></p>
</blockquote>

<p>A <a href="https://en.bitcoin.it/wiki/Deterministic_wallet" rel="nofollow noreferrer">Hierarchical Deterministic (HD) wallet</a> has many addresses.</p>

<blockquote>
  <p><strong>... and I used it once to receive BTCs and then it changed.</strong></p>
</blockquote>

<p>That is normal, for privacy reasons, an HD wallet will generate a new receive address for each transaction in which you will receive BTCs.</p>

<blockquote>
  <p><strong>I can't find my bitcoin address</strong></p>
</blockquote>

<p>Look under the "Addresses" tab</p>

<p><a href="https://i.stack.imgur.com/Tq4kT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Tq4kT.png" alt="example"></a></p>

<p><em>(from <a href="https://bitzuma.com/posts/a-beginners-guide-to-the-electrum-bitcoin-wallet/" rel="nofollow noreferrer">a beginners guide</a>)</em></p>

<blockquote>
  <p>It will be hidden by default. To reveal it, select <code>Show Addresses</code> item from the <code>View</code> menu. </p>
</blockquote>

<hr>

<blockquote>
  <p><strong>i checked according awebanalysis.com/en/bitcoin-address-validate</strong> </p>
</blockquote>

<p>I don't know that site but maybe you mis-typed an address or that site doesn't know about the <a href="https://en.bitcoin.it/wiki/Address" rel="nofollow noreferrer">type of address</a> your wallet is using. Some online sites are not up-to-date with the latest Bitcoin features (e.g. Bech32 type addresses that start <code>bc1</code>...). Try another, for example <a href="http://lenschulwitz.com/base58" rel="nofollow noreferrer">http://lenschulwitz.com/base58</a></p>
