user100182: Say I have 1000 users, each one with its own account with paths m/49'/0'/{user.id}', and I am controlling received/sent funds.
Could I collect all the funds (i.e. inputs) in a sole fat transaction output even though they belong to different accounts of the same HD Wallet?

user100185: Yes. Each input has its own signature with which to sign, so as long as you possess the private keys (or a master private key above the account level), you can add those inputs into any transaction you want.

100182: <p>Say I have 1000 users, each one with its own account with paths m/49'/0'/{user.id}', and I am controlling received/sent funds.</p>

<p>Could I collect all the funds (i.e. inputs) in a sole fat transaction output even though they belong to different accounts of the same HD Wallet?</p>
 100185: <p>Yes. Each input has its own signature with which to sign, so as long as you possess the private keys (or a master private key above the account level), you can add those inputs into any transaction you want.</p>
