What measures are in place to prevent player abuse from making numerous accounts to loot bloody key spawns (multiple brand new level 3 accounts)
You should add a MAC + IP reader and a total level requirement of 1500+ to loot the keys. @Omicron (forget the MAC / IP if it's only a singular key spawn, but keep the level requirement. Players will just make level 3 accounts and log them out at each spawn location if you don't.
You should consider having the keys skull the user(s) looting them, and make it so players cannot protect the key on death. It would prevent people from looting the key, suiciding and keeping it, and also prevent protecting a Bandos item, or an arcane by bringing nothing but the key when looting the chest. This way people won't just bring no items and just suicide loot. We'll see a more active and long lasting result w/ pkers in the areas.
Master donor perk could be an instant teleport option to the key's general location as well (possibly 30 seconds after the initial spawn to make it a reasonably fair yet beneficial perk.
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This update now skulls users who loot the bloody key chest as well, but they can still logout immediately upon looting the chest. Once a user has looted the chest they should take continual damage (as if they were spamming a hot rock cake) while in the wilderness, this way they remain in combat and the means to escape become critical (they also can't just spam rouge's den castle stairs as they will eventually die to hitsplat damage). You could code the hit-markers to start upon bloody chest looting and have it end once a player is outside of the wilderness. If a player tried to logout inside the wilderness after looting the chest, they will receive a message stating, "You cannot logout until you leave the wilderness!" - It should also be noted that players wouldn't be able to drop the item(s) gained from the chest before they are killed, as they would be in combat. The hit-markers would stack w/ any damage taken from players.
The skull given for looting the chest should be a red bountyhunter skull w/ one key above their head, the skull would signify the person has looted the bloody key chest, and that they cannot protect any items, as their +1 protection prayer is disabled until they leave the wilderness.
Players would no longer be able to loot and immediately logout when pkers/white dots arrive due to the hit-markers keeping them in combat until they reach safety. This would make the interaction much smoother in terms of risk vs reward and players would begin bringing amour and gear to survive.
Another addition would be to have a countdown timer once the chest is clicked in which the user unlocks the chest with their key and has it consumed, and they are able to loot the chest after x amount of time. If the user doesn't loot the chest in x amount of time they lose the unlocked chest and will have to get another key. This would give pkers a chance to get to the area sooner and make the looting process riskier as it would globally announce once a player has unlocked the chest (the player would still be waiting for the chest to be lootable after the global announcement).