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Before we dive in on topic I want to be clear that I am not a part of Nebulous. I am a cryptocurrency believer as you are and this article includes the most important paragraphs from the original Sia Blog post. Here is the official source you can read if you want to know more in details:
Official source: https://blog.sia.tech/sia-fork-faqs-c6b3e0e73ce0.
Is SiaCoin fork will occur?
Yes. Nebulous will activate the fork on October 31, 2018. At least two weeks before that event Nebulous will release v1.3.6 of siad and Sia-UI. v1.3.6 will be absolutely identical to v1.3.5 except for the inclusion of fork-related code, making it easy for dissenting forks to build on top of v1.3.5. SiaCoin support team will be offering assistance to anyone who needs help upgrading to v1.3.6.
How do I make sure I am running the forked version?
If you are using software released by Nebulous, v1.3.6 of siad and Sia-UI will contain the new fork code, while v1.3.5 (and earlier) do not. If you are using third-party software, check their documentation. Like previous releases, v1.3.6 will be available for download on our website.
Will there be an airdrop? How do I get my fork tokens?
An airdrop is when the maintainer of a cryptocurrency distributes free tokens to users, typically as a way to promote a new coin. No such airdrop will occur on the Nebulous-backed chain. Maintainers of dissenting forks are free to promote their fork however they like, including airdrops.
Siacoins existing prior to the fork will be spendable on either side of the fork, while siacoins created after the fork will not. If you are currently storing your siacoins on an exchange, you may not receive the corresponding tokens on dissenting forks. If you want to ensure that you can spend these tokens, we recommend withdrawing your siacoins to a wallet that you control before the fork activates.
Are exchanges going to support the fork?
To support the fork, exchanges simply need to upgrade to v1.3.6 of siad when it is released. We expect all exchanges that currently trade Siacoin to support the fork, and we will be contacting them to provide information and technical support.
How does the fork affect Sia’s storage network?
As with siacoins, file contracts formed before the fork will remain valid on both sides of the fork. However, once the chains diverge, renters will not be able to form contracts with hosts on the other side of the fork. As a renter, no action is required: if some of your hosts move to a different chain, your software will automatically replace them with new hosts.
Where can I go to get more information about the fork?
There will be announcements and discussion of the fork on our usual social media channels, Reddit and Discord. For important updates, we recommend subscribing to our email list.