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FLOW token is a contract, which implements Fungible Token Standard interface. If you take a look in the code, you will see that on the higher level totalSupply is defined on implementing contract, but it doesn’t know how much tokens holds each individual account. Each account that would want to own tokens would need to have an instance of the Vault resource stored in their account storage. The Vault resource has methods that the owner and other users can call. Those methods are limited byProvider, Receiver, and Balance resource interfaces. These interfaces declare pre-conditions and post-conditions that restrict the execution of the functions in the Vault.
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