- Threshold security = some given amount of USD expenditure is sufficient to secure the chain, no matter how valuable it is - Flow security = security spend should be a function of economic throughput - Stock security = security spend should be a function of network value
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The distinction is mostly a time horizon one and the attack you are designing against
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If it's profitable to attack stock, then flow is also insecure, so stock is what should be secured. In reality, next block's flow is what pays for its own security. The model hopes this will be enough to cover stock as well.
End of conversation
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The reason I think it's not exclusively one or the other is because stock shows up as the much larger cost, but it wouldn't exist without flows.
After all, stock is the integral of flows.