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Edited ch08_signatures.adoc with Atlas code editor

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ch08_signatures.adoc
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[[c_signatures]]
== Digital Signatures
Two signature algorithms are currently
Two ((("digital signatures", "schnorr signature algorithm")))((("schnorr signature algorithm")))((("digital signatures", "ECDSA")))((("ECDSA (Elliptic Curve Digital Signature Algorithm)")))signature algorithms are currently
used in Bitcoin, the _schnorr signature algorithm_ and the _Elliptic
Curve Digital Signature Algorithm_ (_ECDSA_).
These algorithms are used for digital signatures based on elliptic
@ -13,7 +13,7 @@ keypath spending, and by the script functions +OP_CHECKSIG+,
Any time one of those is executed, a signature must be
provided.
A digital signature serves
A digital signature((("digital signatures", "purpose of"))) serves
three purposes in Bitcoin. First, the
signature proves that the controller of a private key, who is by
implication the owner of the funds, has _authorized_ the spending of