Merge #730: Update scaling term

05ee33f Update scaling term (Marty Jones)

Pull request description:

  This PR updates `linear` to `quadratic` based on my impression that the sighash scaling problem SegWit solves is on the order of O(n<sup>2</sup>) and that Segwit reduces the complexity to O(n).

ACKs for top commit:
  harding:
    ACK 05ee33f

Tree-SHA512: b4618077cbc6dbd90eeea5f48a5d0ff87d93b8ca417f616102d69de5da69ec5ae83d1bec6954dec3df30f4630cf1f25356c6a74802fc73b50df202a9523e99f5

Author: harding

_posts/en/posts/2016-10-28-segwit-costs.md

@@ -148,7 +148,7 @@ In support of existing efforts to pay down technical debt by refactoring and imp
 
 ### Mitigation
 
-Bitcoin already suffers from some significant design debt, and segwit is specifically designed to reduce the impact of some of this debt (notably transaction malleability, linear scaling of signature hashing, and signing of input values).
+Bitcoin already suffers from some significant design debt, and segwit is specifically designed to reduce the impact of some of this debt (notably transaction malleability, quadratic scaling of signature hashing, and non-signing of input values).
 
 The script versioning method provided by segwit provides an elegant way of allowing future soft-fork updates to further reduce design debt, including by fixing bugs in existing opcodes (such as CHECKMULTISIG), re-enabling disabled opcodes (such as CAT), or switching to superior verification methods (such as Schnorr signatures, or aggregate signatures).