Thanks a lot for you help !

So I did check the transaction and when I do sign the transaction that comes :

Error: Error parsing JSON:010000000171d708d452d6644f7cda462d5e27f891f0e1f365db85df77d147ead39b114f4b03000 0001976a9145f73795739fa9f424a293ffb436c83e5afe1402588acffffffff01828deb01000000 001976a914a9342f9303c899dfd73ac42095d493fa5431315488ac00000000

I'll try to find a miner on the forum.