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Diffstat (limited to 'docs/frequently-asked-questions.rst')
| -rw-r--r-- | docs/frequently-asked-questions.rst | 18 |
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diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst index 8fd0c041..e4eee32b 100644 --- a/docs/frequently-asked-questions.rst +++ b/docs/frequently-asked-questions.rst @@ -125,24 +125,6 @@ Example:: } } -Are timestamps (``now,`` ``block.timestamp``) reliable? -======================================================= - -This depends on what you mean by "reliable". -In general, they are supplied by miners and are therefore vulnerable. - -Unless someone really messes up the blockchain or the clock on -your computer, you can make the following assumptions: - -You publish a transaction at a time X, this transaction contains same -code that calls ``now`` and is included in a block whose timestamp is Y -and this block is included into the canonical chain (published) at a time Z. - -The value of ``now`` will be identical to Y and X <= Y <= Z. - -Never use ``now`` or ``block.hash`` as a source of randomness, unless you know -what you are doing! - Can a contract function return a ``struct``? ============================================ |