Trying to catch up with the news, so please bear with me.
Do I understand it correctly that BTC and BCH use the same address space and the same principles of building a blockchain out of transactions but they differ in how transactions are signed now, making them mutually invalid?
In the light of the above, if I decide to spend my pre-fork BTC txout into BCH, I just need to issue a BCH-signed transaction for that txout, right?
After I do that, will this txout be still unspent from BTC network point of view (since my BCH transaction is invalid in BTC and won't go into BTC blockchain)?