Bitcoin address lists
Free, curated reference lists of well-known Bitcoin addresses. The same address corpus powers the Address Monitoring API.
Why these exist
Bitcoin's UTXO model means every coin has a public chain of custody, but matching addresses to real-world entities is forensic work. Vendors like Chainalysis, Glassnode, and Arkham charge meaningfully for these attributions. Most of the data is public though: exchange disclosures, proof-of-reserves attestations, mempool/coinbase patterns, OFAC SDN feeds, Mt. Gox bankruptcy filings, court documents.
We curate it once, publish it free, and let it stand on its own. The paid product is the live signal feed: what the addresses are doing right now, not the labels themselves.