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Four people, including a three-year-old girl, were killed inside a Mexico City-area apartment on September 1 in what prosecutors allege was a robbery targeting a hardware wallet containing approximately $1.5 million in Bitcoin. The case is one of the most violent “wrench attacks” on record, a grim term the crypto community uses for physical assaults aimed at extracting digital assets from their owners.
The victims were Jonathan Samuel Meléndez Ochoa, a 38-year-old musician and co-founder of the Mexican rock band Camilo Séptimo, his 35-year-old wife Ana Paula Barragán, their three-year-old daughter, and 21-year-old Aleyda Romero, who worked as the family’s housemaid. The family’s Golden Retriever was also killed. A six-year-old son survived the attack unharmed.
What prosecutors say happened
The killings took place at the Grand Viure apartment complex in Bosque Esmeralda, Atizapán de Zaragoza, in the Estado de México. Authorities believe the attack occurred between roughly 5:30 p.m. and 8:00 p.m. local time.
Two suspects were arrested within hours. Diego Sebastián “N,” also identified in reports as Diego Sebastián Rosen, and his driver Gerardo “N” now face charges of qualified homicide, pregnancy interruption, and animal cruelty. A Wednesday hearing is scheduled for the pair.
According to Mexican prosecutors, the motive was straightforward: the suspects believed Meléndez Ochoa possessed a cold storage device holding around 30 million MXN worth of Bitcoin, roughly $1.5 million at the time. Investigators allege that Gerardo was offered approximately 2 million MXN for his participation. When the robbery escalated, the suspects allegedly chose to kill all witnesses rather than leave anyone who could identify them.
Authorities say they collected more than 60 pieces of evidence from the scene, including video footage.
The growing threat of wrench attacks
The term “wrench attack” comes from a long-running internet joke: no amount of cryptographic security protects you from someone who shows up with a $5 wrench and threatens to hit you until you hand over your private keys.
Self-custody, the practice of holding your own crypto rather than leaving it on an exchange or with a custodian, is considered a cornerstone of Bitcoin philosophy. But self-custody creates a physical security problem that traditional banking solved decades ago by putting vaults behind armed guards and insurance policies. When you store your wealth in a small device in your home, you become your own bank, and your own bank’s security detail.
The Mexico case illustrates the worst-case scenario. Someone knew, or believed they knew, that a specific individual held significant Bitcoin in a specific physical location. That intelligence, combined with a willingness to use extreme violence, turned a family home into a target.
Self-custody’s security dilemma
The tragedy puts a spotlight on a tension that the crypto industry has never fully resolved. Centralized custody, where a company holds your assets for you, introduces counterparty risk. Exchanges get hacked. Companies go bankrupt. FTX’s collapse in late 2022 burned that lesson into millions of investors’ memories.
Self-custody eliminates counterparty risk but introduces physical risk. Your seed phrase, the string of words that controls access to your funds, is only as secure as the place you store it and the secrecy surrounding your holdings. Multisignature setups, where multiple keys stored in different locations are needed to authorize a transaction, can make wrench attacks less effective because no single person or location holds complete control.
The security calculus changes as Bitcoin’s price rises. A wallet that held $100,000 worth of Bitcoin two years ago might hold several times that today, making its owner a more attractive target without anything about their behavior changing. Operational security, the practice of keeping your holdings private and never disclosing wallet balances publicly, is the first line of defense. But as this case suggests, that information can leak through social connections, business dealings, or simple carelessness.
As legal proceedings against the two suspects continue, the case serves as a brutal reminder that the hardest problem in crypto security was never cryptographic. It was always human.
Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.
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