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Proof of creditworthiness short use case per issue #137 #156

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Proof of creditworthiness short use case per issue #137 #156

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f855ae7
Added proof of creditworthiness short use case per issue #137.
KDean-Dolphin May 22, 2024
60ea7b2
Update short/f6_proof_of_creditworthiness.html
jandrieu Feb 5, 2025
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2 changes: 2 additions & 0 deletions index.html
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Expand Up @@ -427,6 +427,8 @@ <h3>Finance</h3>
data-include-replace="true" data-format="html"></div>
<div data-include="short/f5_new_bank_account_from_home.html"
data-include-replace="true" data-format="html"></div>
<div data-include="short/f6_proof_of_creditworthiness.html"
data-include-replace="true" data-format="html"></div>
</dl>
</section>

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8 changes: 8 additions & 0 deletions short/f6_proof_of_creditworthiness.html
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<dt>
<udef>F.6 Proof of creditworthiness</udef>
</dt>
<dd>
<p>Alice has checking and saving accounts, loans, and credit cards at multiple banks. Due to local regulatory restrictions, the banks may not exchange information about the subjects to whom they issue credit cards.</p>

<p>To prove her creditworthiness when applying for a mortgage, Alice acquires verifiable credentials issued by each bank containing type and balance for each account. She creates a verifiable presentation aggregating all accounts (type and balance) without revealing any issuers of the underlying data.</p>
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The phrase underlying data reads to me as if the VP is doing a selective disclosure over the data in the VCs, but I don't believe we have a mechanism for that.

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<p>To prove her creditworthiness when applying for a mortgage, Alice acquires verifiable credentials issued by each bank containing type and balance for each account. She creates a verifiable presentation aggregating all accounts (type and balance) without revealing any issuers of the underlying data.</p>
<p>To prove her creditworthiness when applying for a mortgage, Alice acquires verifiable credentials issued by each bank containing type and balance for each account. She creates a verifiable presentation aggregating all accounts (type and balance) without revealing any issuers of the underlying data.</p>

What we could do is pass the balance and bank info on, while avoiding the legacy approach of providing bank statements with all the account transactions.

Or maybe something with zksnarks to add a custom predicate to the VP, but I haven't seen anyone work through those details.

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Per our conversation today, let's look at a set of selectively disclosable verifiable credentials which comprise a 3 year history of bank activity (one statement per months). Using predicate proofs, our hero is able to demonstrate that in each and every month they maintained a balance of at least $50,000 USD, without revealing the actual balance values nor the actual transactions.

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Ok. Let's move this forward. I'm going to take on the assignment and base this on 9 annual statements, each a VC with BBS securing algorithm, and zkSnarks for predicate analysis. We'll derive 9 proofs (one from each year), which include the year, the account owner identifier (as DID), and the average balance for that year. These 9 proofs will show that in each year, the funds available to the subject, on average, exceeded $50,000.

</dd>