If you already have a Sia seed with a balance of Siacoins, you can recover and use your Siacoins at any time by using Sia-UI on your computer.
A desktop or notebook computer with a decent amount of available storage space. As of January 2021, you need 24 GB for the Sia blockchain to download. This file will only get larger, so allocate some space to be able to grow with Sia.
Your Sia seed.
Sia-UI installed. Don't have Sia-UI yet?
The Sia blockchain fully synced to Sia-UI. Syncing can take hours on an SSD, and days on a traditional HDD.
Go to the Wallet tab. If there's not another wallet setup already, you'll see two options: Create new wallet and Restore from seed. Click Restore from seed.
If the blockchain isn't fully synched, you'll receive a message telling you to wait. Sia-UI needs to be fully synced because it needs to scan the blockchain for all your transactions.
Once the blockchain is synced, clicking Restore from seed will prompt you for your Sia seed. It must be entered exactly as it was given to you: all lower-case letters, a space between each word, and no spaces at the beginning or end of the phrase. Enter your seed and then click Next.
NoteTipWarningThe text you enter here is readable on the screen, not disguised as bullets. Be sure no one is looking over your shoulder.
Sia-UI will then scan the blockchain.
Give Sia a few minutes, it needs to do some work on your wallet.
After it's done, you'll be taken to the Dashboard. Click back to the Wallet tab to find your balance.
That's it! Sia's so smart, it even pulls your transaction history.