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Questions regarding the act of calling or interacting with (a.k.a. invoking) a contract on the Ethereum blockchain by a user or another contract on the blockchain. Includes both local invocation by call and global invocation by transaction.

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How does contract of dapp figure out who buyer is?

How does contract of dapp(eg. market place) figure out who buyer is? If buyer wants to purchase servive(or product) at certain dapp, he should transfer tokens to contract address of the dapp. At thi …
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