Samsung Sds Co., Ltd.

Sang Ji Bae

Kyu Sang Lee

Kwang Cheol Lee

Jung Eun Lee

Jun Tae Kim

Young Yoo Heo

Sang Won Lee

SAng Hyeon Kang

Kyung Jin Kim

Ki Woon Sung

A blockchain based data management method performed by a computing device according to an embodiment of the present disclosure includes recording a deletion event for off-chain data and time information of the deletion event in a blockchain network, and selectively deleting the off-chain data based on a validity verification result calculated for the time information, wherein the validity verification result is calculated using a time-consensus algorithm of the blockchain network.

Method and apparatus for managing data based on blockchain

A blockchain data recording method includes determining a recording type as one of an on-chain type and an off-chain type according to a target data to be recorded in a blockchain, transmitting a first transaction proposal for recording the target data in a blockchain node configured to store an on-chain data on a blockchain to the blockchain node when the recording type is an on-chain type, and recording the target data in a storage node provided to store an off-chain data, and transmitting a second transaction proposal for storing recording information of the target data in the blockchain to the blockchain node when the recording type is an off-chain type.

Blockchain data recording method and apparatus thereof

A file transmission method includes storing each chunk of a target file by public cloud, receiving, by the first node, a file transmission request including an encrypted chunk order sheet of the target file, information on the target file and recipient information, wherein the chunk order sheet includes connection order information of each chunk necessary for restoring the target file, and the encrypted chunk order sheet is encrypted with a public key of a recipient, storing a first transaction including information included in the file transmission request and chunk storage location information in a ledger stored in the first node, storing, by the second node, the first transaction in a ledger of the second node according to synchronization of the ledger, storing a chunk in the internal storage using the chunk storage location information when the recipient information included in the first transaction includes a user belonging to the intranet.

Blockchain based file management system and method thereof

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Seoul, South Korea

Sang Ji Bae