System and method for cryptographic-chain-based verification of postage transaction records

A system for facilitating cryptographic-chain-based verification of postage transaction records, the system comprising:

• a customer computer system that comprises one or more processors programmed with computer program instructions that, when executed, cause the customer computer system to:
• obtain a customer private key associated with a customer from a secure local storage at the customer computer system;
• obtain a first vendor digital signature derived from a first postage transaction record and a second postage transaction record;
• create a customer digital signature based on the customer private key, the first vendor digital signature, and the second postage transaction record;
• provide the customer digital signature to a vendor computer system associated with the postage vendor;
• and
• responsive to providing the customer digital signature, obtain a second vendor digital signature from the vendor computer system, the second vendor digital signature being based on a vendor private key associated with the postage vendor and the customer digital signature.

A non-transitory computer-readable medium storing instructions which, when executed by a customer processing system associated with a customer including at least one processor, cause the customer processing system to perform operations, the operations comprising:

• obtaining a customer private key associated with the customer from a secure local storage at the customer computer system;
• obtaining a first vendor digital signature derived from a first postage transaction record and a second postage transaction record;
• creating a customer digital signature based on the customer private key, the first vendor digital signature, and the second postage transaction record;
• providing the customer digital signature to a vendor computer system associated with a postage vendor;
• and
• responsive to the providing the customer digital signature, obtaining a second vendor digital signature from the vendor computer system, the second vendor digital signature being based on a vendor private key associated with the postage vendor and the customer digital signature.