R4R: Rigel/safe coins

[rigelrozanski]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added entries in PENDING.md with issue #

• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (alessio/safe-coins@6e34853). Click here to learn what that means.
The diff coverage is 85.81%.

@@                  Coverage Diff                  @@
##             alessio/safe-coins    #3687   +/-   ##
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  Coverage                      ?   61.21%           
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  Files                         ?      190           
  Lines                         ?    13994           
  Branches                      ?        0           
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  Hits                          ?     8567           
  Misses                        ?     4891           
  Partials                      ?      536