Not sure if that's how dapp-core works (since I famously don't use it ????), but does the sendTransactions call also add the current nonce and sign the transactions? If so with what provider are you testing? (Webwallet, Maiar, Extension, etc) Unrelated to that any reason why you aren't using erdjs to construct your transaction but instead you made your own converters for the arguments?

all works since 2 month until now. Just work on another project last week and now when i want to restart, nothing work. I use webwallet and maiar to test, but each times i'm not redirected to my dapp after authentification. And i use this because i didn't know i can use something else. Last time i tried to use create react app script and import erdjs but i had some problems with webpack. So i cloned dapp-template and add some functions for me.

What do you use to connect a wallet to your dApps? Request link to learn.