Software products
In one documented case from 2020, a security researcher found an indexed wallet containing 17 BTC (then ~$170,000). The server belonged to a defunct gaming forum. The original owner had died in 2017. After six months of trying to locate heirs, the researcher followed “internet salvage law” (a gray area at best) and transferred the funds to a charitable crypto fund supporting open-source development.
Using bitcoin-cli or direct DB tools, you can explore the index.
Files found via this query are often trojans or "stealer" malware disguised as wallet data. Your own data