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Fix typo: acheive --> achieve #24

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Sep 26, 2017
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Fix typo: acheive --> achieve #24

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2 changes: 1 addition & 1 deletion src/spec/crypto-conditions.md
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Expand Up @@ -330,7 +330,7 @@ The constants used in the cost functions are selected in order to provide some c

The goal is to produce an indicative number that implementations can use to protect themselves from attacks involving crypto-conditions that would require massive resources to validate (denial of service type attacks).

Since dynamic heuristic measures can't be used to acheive this a deterministic value is required that can be produced consistently by any implementation, therefore for each crypto-condition type, an algorithm is provided for consistently calculating the cost.
Since dynamic heuristic measures can't be used to achieve this a deterministic value is required that can be produced consistently by any implementation, therefore for each crypto-condition type, an algorithm is provided for consistently calculating the cost.

Implementations MUST determine a safe cost ceiling based on the expected cost value of crypto-conditions they will need to process. When a crypto-condition is submitted to an implementation, the implementation MUST verify that it will be able to process a fulfillment with the given cost (i.e. the cost is lower than the allowed ceiling) and reject it if not.

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