International Business Machines Corporation

Rak-Joon Choi

Yedendra Shrinivasan

Krishna Chaitanya Ratakonda

Parameswaran Selvam

Andrew Douglas Nelson

An example operation may include one or more of receiving, by a document processor node, a document and a signed digital receipt identifying an owner of a version of the document associated with a blockchain transaction, verifying, by a document processor node, the version of the document based on the signed digital receipt, and executing a smart contract to enable a conflict-free document versioning based on a hash of the document recorded on a ledger of the blockchain.

Conflict-free version control

An example operation may include one or more of receiving, by a file processing node, a document file identification (ID) from a file owner node over a blockchain, acquiring, by the file processing node, a file storage plan executable script and an encrypted symmetric key for the document, decrypting the symmetric key by the file processing node, and executing the file storage plan executable script using the decrypted symmetric key as an input.

Preservation of privacy in large datasets

An example operation may include one or more of receiving from a user node, by a blockchain processor node, a document access request containing a document ID, acquiring, by the blockchain processor node, from a blockchain ledger an encrypted URL of the document and a source hash of the document based on the document ID, verifying, by the blockchain processor node, a document received from a document owner's node storage based on a decrypted URL of the document and, in response to the verification, transmitting the document received from the document owner's node storage to the user node.

An example operation may include one or more of setting, by a first node, a cut-off time for a resolution of an update to a service contract received from at least one node of a plurality of second nodes over a blockchain, acquiring, by the first node, resolution parameters from a blockchain ledger, and executing a smart contract to resolve the service contract based on the update to the service contract and the resolution parameters.

Automated conflict resolution

An example operation may include one or more of receiving, by a document processor node, a file with a document identifier (ID), generating, by the document processor node, a hash of the file, submitting, by the document processor node, a blockchain transaction containing the hash of the file, the document ID and a locator of a document, assigning, by the document processor node, document access permissions to participating nodes, and notifying the participating nodes of a version of the document under the ID.

An example operation may include one or more of receiving, by a blockchain node, a file as a part of a blockchain transaction, splitting, by the blockchain node, the file into a plurality of chunks based on a file size, transmitting, by the blockchain node, the plurality of the chunks to at least one peer-to-peer data store node on a blockchain network, and generating a storage plan based on locations of individual chunks of the plurality of the chunks on the at least one peer-to-peer data store node.

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Forest Hills, NY, United States of America

Rak-Joon Choi