No, not really. Opentimestamps addresses all of them. Opentimestamps cannot be bruteforced, and there are no keys that could leak. Bruteforcing would require

No, not really. Opentimestamps addresses all of them. Opentimestamps cannot be bruteforced, and there are no keys that could leak. Bruteforcing would require for you to permanently take over the entire bitcoin network.