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Hypothesis
A.1) As a user, I can grant vesting to an arbitrary number of PubkeyHash(es) by locking Ada or any other native token in the vesting contract .
A.5) We as beneficiaries can update the group of beneficiaries i.e. PubkeyHash(es) of the vesting contract if the majority of the existing beneficiaries signs the transaction.
Tests
Refer to PR Multi User Vesting for added tests.
Conclusion
Hypotheses hold, no vulnerability found.