Using Blockchain to Generate Loan Identifiers and PUFIN have filed for a patent on a system that would use blockchain technology to give loans unique indentifiers, like CUSIPs; the system could help with greater market transparency; and PUFIN have begun plans for implementing their system as an open source option for the industry; other firms have introduced this concept with a fee-based system however and PUFIN are marketing their system as free with no fees.  Source


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