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This research uses python to implement a website crawler and uses the API (Application Programming Interface) provided by blockchain.com for data collection. The API can responses the structural transaction history with a hash query, which may represent either a wallet address or a transaction ID. The figure on the right shows the transaction history of the wallet 3QR1DpJMNAap42wgSyNvAtPGqrxGhQnEkN. The address on the left are inputs while those on the right are outputs. We further parse the retrieved JSON format data and standardize the features for change wallet detection.
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