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Denton Liu 2016-08-12 11:47:48 -04:00
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docs/introduction-to-smart-contracts.rst
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@ -95,7 +95,7 @@ registering with username and password - all you need is an Ethereum keypair.
This contract introduces some new concepts, let us go through them one by one. This contract introduces some new concepts, let us go through them one by one.
The line ``address public minter;`` declares a state variable of type address The line ``address public minter;`` declares a state variable of type address
that is publicly accessible. The ``address`` type is a 160 bit value that is publicly accessible. The ``address`` type is a 160-bit value
that does not allow any arithmetic operations. It is suitable for that does not allow any arithmetic operations. It is suitable for
storing addresses of contracts or keypairs belonging to external storing addresses of contracts or keypairs belonging to external
persons. The keyword ``public`` automatically generates a function that persons. The keyword ``public`` automatically generates a function that
@ -220,7 +220,7 @@ only the person holding the keys to the account can transfer money from it.
Blocks Blocks
====== ======
One major obstacle to overcome is what in bitcoin terms is called "double-spend attack": One major obstacle to overcome is what in Bitcoin terms is called "double-spend attack":
What happens if two transactions exist in the network that both want to empty an account, What happens if two transactions exist in the network that both want to empty an account,
a so-called conflict? a so-called conflict?
@ -277,7 +277,7 @@ of transactions sent from that address, the so-called "nonce").
Apart from the fact whether an account stores code or not, Apart from the fact whether an account stores code or not,
the EVM treats the two types equally, though. the EVM treats the two types equally, though.
Every account has a persistent key-value store mapping 256 bit words to 256 bit Every account has a persistent key-value store mapping 256-bit words to 256-bit
words called **storage**. words called **storage**.
Furthermore, every account has a **balance** in Furthermore, every account has a **balance** in
@ -332,7 +332,7 @@ Storage, Memory and the Stack
============================= =============================
Each account has a persistent memory area which is called **storage**. Each account has a persistent memory area which is called **storage**.
Storage is a key-value store that maps 256 bit words to 256 bit words. Storage is a key-value store that maps 256-bit words to 256-bit words.
It is not possible to enumerate storage from within a contract It is not possible to enumerate storage from within a contract
and it is comparatively costly to read and even more so, to modify and it is comparatively costly to read and even more so, to modify
storage. A contract can neither read nor write to any storage apart storage. A contract can neither read nor write to any storage apart
@ -340,7 +340,7 @@ from its own.
The second memory area is called **memory**, of which a contract obtains The second memory area is called **memory**, of which a contract obtains
a freshly cleared instance for each message call. Memory can be a freshly cleared instance for each message call. Memory can be
addressed at byte level, but read and written to in 32 byte (256 bit) addressed at byte level, but read and written to in 32 byte (256-bit)
chunks. Memory is more costly the larger it grows (it scales chunks. Memory is more costly the larger it grows (it scales
quadratically). quadratically).
@ -364,7 +364,7 @@ Instruction Set
The instruction set of the EVM is kept minimal in order to avoid The instruction set of the EVM is kept minimal in order to avoid
incorrect implementations which could cause consensus problems. incorrect implementations which could cause consensus problems.
All instructions operate on the basic data type, 256 bit words. All instructions operate on the basic data type, 256-bit words.
The usual arithmetic, bit, logical and comparison operations are present. The usual arithmetic, bit, logical and comparison operations are present.
Conditional and unconditional jumps are possible. Furthermore, Conditional and unconditional jumps are possible. Furthermore,
contracts can access relevant properties of the current block contracts can access relevant properties of the current block