Sci-Net uses Sci-Hub decentralized tokens to support smooth exchange of information. To get the invite code, you need to have Sci-Hub tokens on the Solana network. If you're completely new to the decentralized tokens topic, here is the step-by-step instruction:

Another option is to install a crypto wallet on your mobile phone:
download solana wallet
This is the application where you can store, send and exchange tokens on Solana, includig Sci-Hub token. To scan the code, you will need to install either Phantom or Solflare on a mobile phone
: get SOL tokens
Inside the application, you can buy any amount of Solana tokens starting from 0.02 SOL (one SOL token equals around 70,000 Sci-Hub tokens) To start using the platform, you need to have minimum 1000 Sci-Hub tokens
get Sci-Hub tokens
Once you have SOL tokens, you can swap them to Sci-Hub tokens inside the application. Get from 1000 to 12000 Sci-Hub tokens using swap function.
get invite code
Press the button below: if you press 1 the QR code for 1000 tokens will be generated, 2 for 2000 and so on, the maximum is 12000.
wait while QR is generated...
waiting for tokens...

Use Solflare or Phantom mobile application to scan the code (on Solflare, you must use the small button in the top right corner in the main application screen) and transfer tokens to Sci-Net. You will get the invite code to register. After registration, tokens submitted here will be available on your Sci-Net account.

Note: the QR code will be active for 8 minutes. If no invite appears after senging tokens, press re-check button.

invite code
error while generating QR code :(