December 2018
Beginner to intermediate
564 pages
17h 34m
English
Content preview from Blockchain Developer's Guide
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The promises
The first aspect of a smart contract is that it must make a set of programmatic promises. The reason we have chosen a token sale contract to look at is that it has a very simple promise to make: if you send the contract Ethereum, the contract will in turn automatically send your account a new token. Let's look at some basic code, which is explicitly not for production; this is simplified code to make certain concepts clearer. This code comes from the StandardToken contract, part of the OpenZeppelin (You'll find a link for the same in the References section) project on which this is based, which has full-featured and audited code to achieve the same effect but is more complicated to understand.
First, here is an interface contract ...
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