user75052: I have this Bip44 path implemented 
m / purpose' / coin_type' / account' / change / address_index 

Is it possible to use the Master private key to sign all the tx
ie. Bitcoin TX, Etherum TX
or do I have to get the asset based private keys for each asset and sign the tx's ?

user38618: 
or I have to get the asset based private keys for each asset and sign the tx's ?

Yes, you can't sign transactions using the master private key. Sign each transaction using the derived private keys.

75052: <p>I have this Bip44 path implemented </p>

<pre><code>m / purpose' / coin_type' / account' / change / address_index 
</code></pre>

<p>Is it possible to use the Master private key to sign all the tx<br>
ie. Bitcoin TX, Etherum TX</p>

<p>or do I have to get the asset based private keys for each asset and sign the tx's ?</p>
 38618: <blockquote>
  <p>or I have to get the asset based private keys for each asset and sign the tx's ?</p>
</blockquote>

<p>Yes, you can't sign transactions using the master private key. Sign each transaction using the derived private keys.</p>
