To date, it’s been hard to sell data guaranteeing that the seller will receive payment for data once it’s been sent. 

But in a new paper, our team came up with a new scheme that ensures both sides of the transaction: Fair Data Exchange.

To date, it’s been hard to sell data guaranteeing that the seller will receive payment for data once it’s been sent. 

But in a new paper, our team came up with a new scheme that ensures both sides of the transaction: Fair Data Exchange. https://a16zcrypto.com/posts/article/new-paper-alert-fair-data-exchange/

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In the paper, we outline a new protocol for building fair data-markets – including for expired blobs under EIP-4844, also known as “protodanksharding,” which went live just last week.

In short, this new approach allows you to buy a potentially large blob of data (that has the properties you think it has) with minimal trust assumptions.

We also introduce a new cryptographic primitive, Verifiable Encryption under Committed Key (VECK), which generalizes verifiable encryption to symmetric key primitives and which could be useful in other protocols.

Check out the full paper here: https://a16zcrypto.com/posts/article/new-paper-alert-fair-data-exchange/

The protocol enables a storage server to transfer a data file to a client atomically with most of the communication happening off-chain: The client receives the file if and only if the server receives an agreed-upon payment.