Black Lake Digital Markets on August 6 announced Harbor Verify, a blockchain-based verification tool designed to let investors, lenders, auditors, and rating agencies check whether tokenized real-world assets meet a pool’s agreed eligibility criteria. The company said the process can be triggered on demand from a browser and does not require reviewers to see private borrower data.
Built to replace review processes centered on reports, data rooms, and attestations
Black Lake said tokenizing a credit portfolio on its own does not give capital providers enough evidence to assess the assets underneath it. Before allocating capital, curators, lenders, and investors still need proof of the portfolio’s stated composition and proof that the underlying loans met the published eligibility rules.
According to the company, those checks are commonly handled through bilateral reports, restricted data rooms, and attestations from the parties assembling or reviewing the portfolio. Harbor Verify is meant to change that by making those claims independently testable against cryptographic proofs and onchain commitments, while keeping the confidential underlying data out of view.
Two checks run at the loan level
In Black Lake’s description, a reviewer picks a pool and a loan, then runs two checks locally on their own machine. That can be done through a downloadable package, through an independent algorithm available from multiple public sites, or through the Harbor Verify platform itself.
The first check asks whether the correct eligibility rules were used. Each pool publishes an eligibility rulebook covering requirements such as FICO score, loan-to-value ratio, geography, and seasoning, and the hash of that rulebook is anchored onchain. Harbor Verify hashes the published rulebook and compares that value with the hash in the loan’s proof and the hash recorded onchain. The check clears only if all three match.
The second check asks whether the loan belongs in the pool at all. Black Lake said every one of its pools is anchored onchain and represented by a permissioned marker. Harbor Verify reconstructs the pool’s Merkle commitments to verify inclusion of the loan and to confirm that no loans were added, removed, or substituted without detection. It then verifies a zero-knowledge proof showing that the loan met the pool’s eligibility requirements.
First deployment targets a $25 million residential mortgage portfolio
Black Lake is first applying the model to a $25 million portfolio of residential mortgage loans. Harbor Verify, the company said, lets reviewers check the loans represented in that portfolio and whether those loans satisfied the portfolio’s encoded eligibility rules, all without receiving borrowers’ nonpublic personal information, or NPI.
The process uses hashes, yes-or-no outputs, and cryptographic proofs. Borrower names, credit scores, loan balances, addresses, and other private details are not disclosed to the reviewer. Black Lake said that disclosure-free verification removes the need for the NDAs, data rooms, and redaction cycles that have traditionally been tied to loan-level review.
Checks can be repeated at any time
If all checks pass, Harbor Verify confirms that a specific loan is part of a specific pool, that it was evaluated against the published eligibility rules, and that it passed. If a check fails, the tool identifies the precise step and the exact value that did not match.
Because the checks run against public onchain anchors, Black Lake said the review process is investor-driven and on demand. It can also be repeated at any time without added cost.
Black Lake says institutions need something they can run themselves
“There are lots of chain-based attestation frameworks out there, similar to traditional finance. But institutional buyers need a test they can run themselves rather than another party’s assurance,” said Al Qureshi, CEO and co-founder of Black Lake Digital Markets.
“With Harbor Verify, trust bottoms out in code you can rebuild and a check you run on your own machine. That is what it takes to turn a token into an instrument an institution can actually underwrite.”
Planned availability beyond Black Lake-issued assets
Because Harbor Verify checks assets against public onchain records, Black Lake said the technology can also be used to verify assets issued outside its own platform. The company said it plans to make Harbor Verify available to other issuers seeking to bring independently verifiable assets to market under the Harbor Verify mark.
Nuva Labs partnership offered as an early example
Black Lake pointed to its June 2026 work with Nuva Labs as an early look at Harbor Verify in use. Nuva Labs, described by Black Lake as a leading blockchain development firm, serves as its infrastructure partner across the asset lifecycle, covering loan tokenization, onchain data security, and future support for investor distribution.
That partnership began with the tokenization of more than 4,000 down payment assistance mortgage loans valued at over $25 million, ledgered and registered on Provenance Blockchain. Black Lake said the pool is expected to be among the first verified using Harbor Verify, giving investors a concrete example of how the tool confirms both eligibility and pool integrity before an asset moves toward distribution.
“Nuva Labs exists to give issuers the infrastructure to bring institutional-quality assets on-chain at scale, and Harbor Verify is proof of what that infrastructure enables,” said Anthony Moro, CEO of Nuva Labs.
“We built the rails; Harbor Verify shows what's possible when you can independently check what's running on them. Provenance is already the world's largest public blockchain for RWAs, and this rollout will help drive institutional use to the next level.”
Product access and company details
Black Lake said Harbor Verify uses multiple patent-pending methodologies. The service is available at harbor-verify.com. Harbor, the access platform for Black Lake Digital Markets assets, is available at harbor.blacklakeservices.com.
About Black Lake Digital Markets
Black Lake Digital Markets is the technology arm of Black Lake Investment Solutions and is headquartered in Wayzata, Minnesota. The company develops proprietary platforms for mortgage underwriting, quality control, pricing, trading, transfer, and compliance, including RuleStudio™, READY™, MATRIX™, HyperDrive™, DataVision™, and Correspondent in a Box™. Its platforms serve originators, servicers, investors, and intermediaries across primary and secondary mortgage markets.
About Nuva Labs
Nuva Labs, formerly Provenance Blockchain Labs, provides digital asset issuers with full-lifecycle blockchain infrastructure for tokenization, management, and distribution of real-world assets at scale. Its offering spans structuring advice, mission-critical APIs, SaaS services, and broader multi-chain Web3 distribution through vault marketplaces such as NUVA. The company is also the leading developer and integration partner on Provenance Blockchain, a public Layer 1 network with more than $26 billion in real-world asset total value locked, or TVL.