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Tokens in Zero represent any standard cryptographic token on a blockchain, including but not limited to Ethereum's Ether (ETH) and tokens compatible with Ethereum's ERC-20, 223, 721 and 777 standards. The Zero Token System refers to the entire set of token related protocols that make cryptographic token exchange possible in Zero.
The Zero Token System represents the architecture and set of protocols that make token exchange possible within Zero. The Infinite Economy (outlined in The Infinity Token) is used generally to represent all Tokens, protocols and associated transactions that make up and take place within Zero's economy.