In a significant case of alleged financial misconduct, a Miami man has been accused of stealing nearly $2 million in cryptocurrency from a former employer, according to an arrest report from the Miami Beach Police Department. The crime reportedly involved laundering the stolen funds through multiple digital wallets, exchanges, and bank accounts.
The investigation was prompted when the victim noticed unauthorized Bitcoin transactions linked to a Trezor hardware wallet dating back to 2020. At that time, the value of Bitcoin was approximately $115,363 per coin, culminating in an estimated loss of around $1.9 million for the victim.
The victim became suspicious of Nahum Reynaldo Castro, a former employee regarded as trustworthy since 2013. Castro served as an information technology specialist and was known for his technical skills, which likely enabled him to carry out the alleged theft. Notably, he was one of only two individuals with access to the wallet’s seed phrase, a crucial recovery key that allows access to cryptocurrency assets. This access would enable someone to recreate the wallet remotely, facilitating the transfer of its contents without needing the physical device.
Upon discovering the unauthorized transactions, the victim reached out to trusted associates for assistance. In March, after a detailed investigation, the victim and a witness provided detectives with transaction data linked to the wallet and the suspicious transfers. Further collaboration with law enforcement revealed consistent statements from the victim and two accompanying witnesses during a follow-up meeting earlier this month.
Cryptocurrency exchange Bitstamp played a pivotal role in the investigation. Records obtained from the exchange included Castro’s driver’s license and a verification video that appeared to confirm his identity. These records were complemented by JPMorgan Chase bank documentation that traced deposits sourced from Bitstamp accounts connected to the questionable transactions.
Authorities allege that Castro was involved in a series of unauthorized cryptocurrency transactions designed to transfer and conceal the stolen funds. They indicated that these transactions were intended to obscure the “nature, source, ownership, and control” of the cryptocurrency proceeds, effectively hindering detection and recovery efforts.
Castro was taken into custody on Monday and is currently facing several serious charges, including money laundering involving more than $100,000, unlawful use of a communications device, offenses against computer users, and first-degree grand theft exceeding $100,000. As of Wednesday morning, he is being held at the Turner Guilford Knight Correctional Center, with his bond status listed as “to be set.”
