Как отслеживаются транзакции в сети биткоина? https://forklog.com/cryptorium/kak-otslezhivayutsya-tranzaktsii-v-seti-bitkoina
How are transactions tracked on the Bitcoin network? forklog.com2 min September 4, 2019 View Original In January 2018, the Bitfury Group (one of the world's largest developers and providers of blockchain solutions) introduced the Crystal tool to financial institutions and law enforcement agencies, which it created specifically for conducting investigations related to Bitcoin.
Crystal analyzes information in the Bitcoin blockchain, focusing on given addresses and sets of transactions, and also goes beyond the network and collects data related to the request from all available sources: websites, thematic forums, etc.
The tool visualizes the movement of funds up to the final address and the withdrawal of crypto assets into fiat currency and sends the results to the client’s email. At the same time, if when manually tracking you can encounter the problem of a large ramification of funds flows, the result of Crystal’s work is a list of specific addresses to which the money has reached, as well as a determination of all the routes for their delivery.
The investigation may delve deeper into transaction risk assessment and tracking of suspicious transactions by BTC address, but the developers claim that ultimately, by applying a unique clustering algorithm, Crystal is able to identify the real name of the coin holder.
Version 2.2 of Crystal adds several more features for investigators' convenience. For example, clients can set up notifications about activities at a specific address with the ability to add a list of addresses involved in a transaction to monitoring and visualization in one click, as well as track transactions performed between addresses using intermediaries.
As an example of the effectiveness of Crystal, its creators cite the investigation into the WannaCry ransomware virus . In May 2017, it caused nearly $1 billion worth of damage to its victims in four days, affecting the UK National Health Service, Spain's largest telecom company Telefónica, the American logistics giant FedEx and users from 150 countries. Using their tool, within three hours the creators of Crystal tracked the movement of funds from the attackers’ Bitcoin wallets (to withdrawal points through the Changelly and ShapeShift crypto exchanges) and determined who was behind the attacks.
Bitfury also conducted an investigation into the September 2018 hack of the Japanese bitcoin exchange Zaif , which lost $60 million in crypto assets, including 6,000 bitcoins, as a result of hackers’ actions.
The researchers determined that part of the stolen funds was sent for withdrawal through the Binance cryptocurrency exchange, the other part was broken into small amounts and distributed to numerous addresses through mixers, gaming services and other crypto exchanges, and 30% remained at addresses that were not previously exposed on the network, presumably belonging to the burglar. After this, the addresses registered to unknown persons were transferred to Crystal for further monitoring.
