Which of these are advantages of using the Bitcoin blockchain to generate a cryptographic beacon? (check all that apply)
| The beacon outputs random bits at frequent intervals | Correct |
| No central authority is needed | Correct |
| Fresh random bits can be obtained at any desired future time | Wrong |
| The cost to an attacker to manipulate the beacon's output is quantifiable | Correct |
| Manipulating the beacon output requires 51% mining power | Wrong |
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