user100526: Due to bip 44 list
https://github.com/satoshilabs/slips/blob/master/slip-0044.md

HD wallets support multi coins.
does it mean HD wallets support multi networks? like omni for bitcoin, TRc20 for tron?
what is network role in the HD wallets? I think in the derivation of child for multi coin, nothing, yes? but what about in sign a transaction? is there any difference or all networks are same?

user13866: 
does it mean HD wallets support multi networks? 

No.
A Bitcoin wallet can implement BIP-0044 without supporting any cryptocurrency other than Bitcoin.

100526: <p>Due to bip 44 list</p>

<pre><code>https://github.com/satoshilabs/slips/blob/master/slip-0044.md
</code></pre>

<p>HD wallets support multi coins.</p>

<p>does it mean HD wallets support multi networks? like omni for bitcoin, TRc20 for tron?
what is network role in the HD wallets? I think in the derivation of child for multi coin, nothing, yes? but what about in sign a transaction? is there any difference or all networks are same?</p>
 13866: <blockquote>
  <p>does it mean HD wallets support multi networks? </p>
</blockquote>

<p>No.</p>

<p>A Bitcoin wallet can implement BIP-0044 without supporting any cryptocurrency other than Bitcoin.</p>
