Hi @arycloud
Befor we start : For “safety” ! it’s recommended to run these sites OFFLINE by downloading them and running them locally : https://github.com/iancoleman/bip39
You have the xPrivKey and the mnemonic… Both of them can be used on https://iancoleman.io/bip39/ with a derivation path listed in the Json you decrypted then click on the BIP44 tab to generate a list of your addresses/private keys .Or, you can simply restore the seed mnemonic into any BIP44 compatible wallet
steps :
- Put your mnemonic in https://iancoleman.io/bip39/ (OFFLINE)
- choose Coin type (ex : BTCtestnet)
- choose Derivation Path BIP44
- edit to match your rootPath (rootPath listed in the json file ex : m/44’/1’/0’)
- Et voila your Derived Addresses are bellow search for the exact one you interested in , and use the Private Key with the issuer
Hope the process is clear .