Well you aren't answering my main question which is Lightweight wallets , what is going to happen to those and why should I switch fast . I'am not using Bitcoin Core anymore anyway and the big question will I lose my BTC ? Bitcoin XT bitcoins = Bitcoin Core bitcoins or not ?
As far as I understand Bitcoin core BTC are the same as XT BTC until XT pushes its first block larger than 1MB. At that point XT BTC are different than core BTC. Whichever chain grows faster becomes the valid chain and valid BTC. Your SPV wallet compatibility depends on whether the SPV server you're using is using XT or core.
Don't spend your BTC on the XT chain. If your SatoshiCoins are tainted with Gavincoins and you try to spend them, catastrophic consensus failure may occur, and you will lose them.
http://qntra.net/2015/01/the-hard-fork-missile-crisis/Unlike previous forks where political consensus was achieved, this fork is guaranteed to result in conflict – the Great Blockchain Civil War starts. MPEx and others will refuse to accept any outputs contained in the Giga-blockchain, MPEx will also begin to actively attack it:
mircea_popescu: ben_vulpes if one block's large and the other small, all i need a tx that's included in the large block but not the small one. then doublespend it on the small one, which will be rejected necessarily by the large block blockchain
mircea_popescu: now i have bitcoin separated in two addresses, one for each chain.
mircea_popescu: the attempt may fail, but the cost to me of this failure is not significant, so i can keep on trying until it succeeds.
mircea_popescu: the only way to guard against it is, obviously,for the ."large" chain to maintain 1:1 identity with the "small" one. because you don't just fork bitcoin.,
ben_vulpes: i still fail to see how you're going to make a txn that gets included in the large block chain and not the small block chain.
artifexd: ben_vulpes: You don't. You keep sending money to yourself until it happens.
mircea_popescu: ben_vulpes what do you mean ? it necessarily will occur.
mircea_popescu: since one contains more txn than the other by definition.
mircea_popescu: suppose i make 50k 1btc txn. they don't fit in a 1mn block. they do fit in a 10mb block. what now ?
As the Giga-blockchain and main-blockchain continue to grow from the fork, those actively attacking the Giga-Blockchain will create many transactions that allow their main-blockchain coins to duplicate over to the Giga-blockchain while remaining safely on the main-blockchain. The transactions that succeed can then be used to acquire more main-blockchain coins upon which the cycle repeats. Eventually the blockchain with the most financial resources behind it will continue to grow at a faster pace, while the other slowly, and eventually stops growing altogether.
It will be impossible for the Giga-chain to keep 1:1 parity with the main chain from which it forks, they contain different transaction, although some may overlap