Feature/coconut double spend prev #1457
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neacsu
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durch,
futurechimp,
jstuczyn and
octol
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Description
Implement additional checks in gateway and validator API that prevent a coconut credential from being re-used.
The used credential ledger is kept inside the Coconut Bandwidth Contract, which also manages the release of funds attached to a credential.
Closes: #2027
Checklist:
CHANGELOG.md