SBT was first proposed by Vitalik in a January article and elaborated on in Decentralized Society: Finding Web3’s Soul. Soulbound may be a strange word. It comes from World of Warcraft, where most of the very powerful equipment in the game is soulbound, meaning that once picked up, it cannot be transferred or sold by the player. So in simple terms, Soulbound Token (SBT) can be understood as a non-transferable NFT. The definition of SBT may be simple, but the idea behind it is profound. The wh...