Here is the most common method currently mentioned ⇒ verified by Collab.Land robot

Usually the project team will set up a dedicated Channel (channel) for users to input instructions, when the correct input "!join", the robot will automatically reply and give you a DM (private message).

However, starting on 2021/12/04, Collab.Land bot has been upgraded and stopped the original DM private message verification process. It set up a new channel #collabland-join.

Please visit this new channel directly #collabland-join Press the "Let's go!" button Then press the "Connect Wallet" button.

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Please click on the third option "WalletConnect"

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A small window for signing will pop up, and then click "Sign Message".

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If successful, the following prompt message will be displayed, indicating that the NFT in your wallet has been successfully connected and verified.

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How to use NFTs Marketplace ? (Opensea)