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Correct whitespace

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William Entriken 2018-03-06 22:50:01 -05:00 committed by GitHub
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6
EIPS/eip-721.md
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@ -37,7 +37,7 @@ Differences between this standard and EIP-20 are examined below.
## Specification
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
**Every ERC-721 compliant contract must implement the `ERC721` and `ERC165` interfaces** (subject to "caveats" below):
@ -47,7 +47,7 @@ pragma solidity ^0.4.20;
/// @title ERC-721 Non-Fungible Token Standard
/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
/// Note: the ERC-165 identifier for this interface is 0x6466353c
interface ERC721 /* is ERC165 */ {
interface ERC721 /* is ERC165 */ {
/// @dev This emits when ownership of any NFT changes by any mechanism.
/// This event emits when NFTs are created (`from` == 0) and destroyed
/// (`to` == 0). Exception: during contract creation, any number of NFTs
@ -287,7 +287,7 @@ The transfer and accept functions' documentation only specify conditions when th
- **Disallow transfers if the contract is paused** — prior art, CryptoKitties deployed contract, line 611
- **Blacklist certain address from receiving NFTs** — prior art, CryptoKitties deployed contract, lines 565, 566
- **Disallow unsafe transfers** — `transferFrom` throws unless `_to` equals `msg.sender` or `countOf(_to)` is non-zero or was non-zero previously (because such cases are safe)
- **Disallow unsafe transfers** — `transferFrom` throws unless `_to` equals `msg.sender` or `countOf(_to)` is non-zero or was non-zero previously (because such cases are safe)
- **Charge a fee to both parties of a transaction** — require payment when calling `approve` with a non-zero `_approved` if it was previously the zero address, refund payment if calling `approve` with the zero address if it was previously a non-zero address, require payment when calling any transfer function, require transfer parameter `_to` to equal `msg.sender`, require transfer parameter `_to` to be the approved address for the NFT
- **Read only NFT registry** — always throw from `unsafeTransfer`, `transferFrom`, `approve` and `setApprovalForAll`