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A guide to smart contract security best practices

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### Contexts: >Feel free to submit a pull request, with anything from small fixes, to full new sections. If you are writing new content, please reference the [contributing](https://github.com/ConsenSys/smart-contract-best-practices/blob/master/docs/about/contributing.md) page for...

```Solidity // Disallow withdraws that exceed current rate limit require(currentPeriodAmount + amount < limit, 'exceeds period limit'); currentPeriodAmount += amount; msg.sender.transfer(amount); ``` [Elsewhere](https://consensys.github.io/smart-contract-best-practices/development-recommendations/general/external-calls/#dont-use-transfer-or-send) the guide recommends against using `transfer`.

基于pull的支付系统 is linked to original English version. Link it to current Chinese version instead.

help wanted

We should support this proposal: https://github.com/ethereum/EIPs/pull/679/commits

help wanted
opsec

* Add README-pt-br.md for Brazilian portuguese Language * Add notice to translation pages * Remove gitter links