Erc 677 license

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Overview

ERC-677 is an Ethereum token standard proposal that adds a transferAndCall function on top of ERC-20, allowing tokens to be sent to a contract and trigger logic in that contract within a single transaction. When transferAndCall is used, the tokens are transferred and the recipient contract's onTokenTransfer function is then invoked with additional data, removing the need for a separate approve-then-call sequence. The standard remains backward compatible with ERC-20, and Chainlink's LINK token is the best-known ERC-677 implementation, used so that oracle contracts can react immediately to LINK payments.

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