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“...Recently, it has become clear that the crypto community’s privacy is at risk. Everytime one makes a transaction on the Bitcoin blockchain, the transaction is recorded on the blockchain in perpetuity for anyone to see. We have seen the BitFury Group use this information to de-anonymize over 15% of the entire Bitcoin network, along with many other examples. This led us to create Bitcoin Private (BTCP) - a fork-merge of the ZCL & BTC blockchains and introduction of the zk-SNARKS feature to Bitcoin...”

https://www.reddit.com/r/BitcoinPrivate/comments/7todw0/historical_bitcoin_private_hard_fork_snapshot/