If you had a SiaCoin (SC) balance as of block 179,000, you’re eligible for airdropped coins at a ratio of 1SCP for every 5SC in your wallet. Download the SiaPrime-UI wallet and “Load a wallet from a seed” using your Siacoin seed for both the seed and the password.
Additionally, the SiaPrime team determined the top 35 largest SC addresses likely belonged to exchange wallets, with none expressing interest in distributing the assets. We subsequently placed them into cold storage and have determined it unlikely the exchanges will distribute the airdrop in the future. Thus, we expect to use these coins to further advance the project.