Alior Bank
↳ Off-chain data. On-chain proof.
We co-created a durable medium solution on public Ethereum to verify regulated banking documents without exposing data. Featured in Forbes.
Alior Bank needed a proof layer to make regulated documents verifiable over time without putting sensitive customer data on-chain.
We partnered with the bank’s internal team to build a system that anchors cryptographic integrity commitments on public Ethereum and integrates verification logic directly into banking workflows.
Alior Bank’s Challenge
“Durable medium” regulations require long-term evidence that a document was delivered and remains unchanged – independently verifiable even years later.
Alior’s legacy process involved sending over a million paper letters annually. This created immense pressure to find a reliable, digital alternative that could integrate with existing enterprise systems.
Requirements for the project and the technology partner
“Nextrope made the Blockchain service available guaranteeing the quality consistent with the quality standard contained in the contract”
Tomasz Sienicki
[ Blockchain Strategy Manager, Alior Bank ]
Approach
We focused on a security-first verification method:
- generate integrity commitments off-chain so no document content touches the blockchain
- anchor proofs on Ethereum via smart contracts
- enable verification through a dedicated service with audit-friendly outputs
Node.js
Postgresql
nginx
Solidity
Outcome
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