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+# bundler-checksum
+
+Bundler patch for verifying local gem checksums
+
+## Install
+
+Add the following to your Gemfile:
+
+```
+if ENV['BUNDLER_CHECKSUM_VERIFICATION_OPT_IN'] # this verification is still experimental
+  require 'bundler-checksum'
+  Bundler::Checksum.patch!
+end
+```
+
+## Usage
+
+Once the gem is installed, bundler-checksum will verify gems before
+installation.
+
+If a new or updated gem is to be installed, the remote checksum of that gem is stored in `Gemfile.checksum`.
+Checksum entries for other versions of the gem are removed from `Gemfile.checksum`.
+
+If a version of a gem is to be installed that is already present in `Gemfile.checksum`, the remote and local
+checksums are compared and an error is prompted if they do not match.
+
+Gem checksums for all platforms are stored in `Gemfile.checksum`.
+When `bundler-checksum` runs it will only verify the checksum for the platform that `bundle` wants to download.
+
+
+## Development
+