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Merge pull request #9805 from ethereum/develop

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Merge develop into breaking.
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chriseth
2020-09-14 20:48:03 +02:00
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commit efe829b4b2
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docs/examples/micropayment.rst
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@@ -61,12 +61,11 @@ For a contract that fulfils payments, the signed message must include:
2. The amount to be transferred.
3. Protection against replay attacks.
A replay attack is when a signed message is reused to claim authorization for
a second action.
To avoid replay attacks we use the same as in Ethereum transactions
themselves, a so-called nonce, which is the number of transactions sent by an
account.
The smart contract checks if a nonce is used multiple times.
A replay attack is when a signed message is reused to claim
authorization for a second action. To avoid replay attacks
we use the same technique as in Ethereum transactions themselves,
a so-called nonce, which is the number of transactions sent by
an account. The smart contract checks if a nonce is used multiple times.
Another type of replay attack can occur when the owner
deploys a ``ReceiverPays`` smart contract, makes some