Download Raw Blockchain Data (Less Common for Addresses Directly):

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Method: Companies like Chainalysis, Elliptic, Glassnode, CryptoQuant, or academic projects like Cardiff University's CUBiD (as discussed previously) process the raw blockchain data and provide structured datasets and analytics, often including address-level information, classifications (e.g., exchange addresses, mining pool addresses), and aggregated metrics.
Data Access: These services typically offer subscriptions, custom data exports, or APIs to access their refined data.
Pros: Data is often cleaned, labeled, and optimized for specific types of analysis (e.g., financial forensics, market intelligence).
Cons: Usually very expensive, and you are reliant on their methodologies for data processing and attribution.


You can sometimes download the raw okx database block files (the blocks and chainstate folders from a Bitcoin Core installation). However, this is just the raw ledger. To extract meaningful address data (like balances), you still need software to parse and index this data, essentially doing what a full node does.

In summary, a direct, comprehensive "Bitcoin address database download" in a simple, ready-to-use format isn't a standard offering. To work with Bitcoin address data on a large scale, you generally need to interact directly with the blockchain (by running a node), leverage APIs from explorers, or subscribe to specialized blockchain analytics services.
Yes, Cardiff University is involved with a specific Bitcoin database project called CUBiD (Cardiff University Bitcoin Database).