Canister controller and cycle balance need to be public

Developers
16

@wang Check this out GitHub - ninegua/ic-blackhole: Once a canister sets its only controller to a black hole, it becomes immutable and more!

With the blackhole canister, you can check the status of any canister that has set one of their controllers to the blackhole canister. For example to see the status of the blackhole canister itself:

dfx canister --network=ic --no-wallet call blackhole canister_status '(record { canister_id = principal "e3mmv-5qaaa-aaaah-aadma-cai"; })'
(
  record {
    status = variant { running };
    memory_size = 304_221;
    cycles = 2_126_143_362_964;
    settings = record {
      freezing_threshold = 2_592_000;
      controllers = vec { principal "e3mmv-5qaaa-aaaah-aadma-cai" };
      memory_allocation = 0;
      compute_allocation = 0;
    };
    module_hash = opt blob "!\0c\f9A\e5\caw\da\ac1J\91Qt\83\ac\17\12dR~=\0dq;\92\bb\95#\9d}\e0";
  },
)
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