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It's a new address format for Bitcoin Cash proposed by BitPay, to prevent BTC/BCC address confusion. It's not widely used, currently.

• The old addresses that start with 1 (P2PKH) are converted to addresses that start with C

• The old addresses that start with 3 (P2SH) are converted to addresses that start with H

References:

BitPay blog post: https://support.bitpay.com/hc/en-us/articles/115004671663-BitPay-s-Adopted-Conventions-for-Bitcoin-Cash-Addresses-URIs-and-Payment-Requests

BitPay address translator: https://bitpay.github.io/address-translator/