A bifurcation (chain split) of bitcoin occurred this year, first was the Bitcoin Cash BCH on july 2 2017, second was SegWit2x B2X (BitcoinX2) launched on 20 oct 2017 and the third is Bitcoin Gold BTG on 23 oct 2017! SegWit2x B2X (BitcoinX2) they have not yet released their own blockchain, but the tests are very close to be end, and these period will launch their own blockchain! So.. if you have bitcoin in your wallet when the launch will ocurred , you will just have the equivalent of the bitcoin you are hold in the ratio of 1:1.. You must know that the developers of these new coins are different of bitcoin developers and that it will take some time until these coins will be really strong, because they are bitcoin childs :D and for sure will be strong coins! but must past time! here you have the bittrex statement for Bitcoin Gold https://support.bittrex.com/hc/en-us/articles/115002320451-Statement-on-Bitcoin-Gold-BTG- and here other discussions about this subject https://bitcointalk.org/index.php?topic=2254181.0;all . Thanks for your vote :D