Start implementing a cas in separate crates.

Cargo.lock

@@ -2,62 +2,6 @@
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@@ -74,20 +18,24 @@ dependencies = [
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 dependencies = [
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- "error-chain",
- "hostname",
- "libbsv",
+ "digest",
+ "sha2",
+ "thiserror",
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@@ -137,28 +61,6 @@ dependencies = [
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@@ -171,82 +73,20 @@ dependencies = [
 
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