Data security of shared blockchain data storage based on error correction code

A system communicating shared blockchain data, comprising:

• one or more processors;
• and
• one or more computer-readable devices coupled to the one or more processors and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more processors, perform operations comprising:
• receiving a request from a blockchain node to be removed from a blockchain network;
• identifying a plurality of blocks associated with blockchain data stored by the blockchain node;
• determining, for each block in the plurality of blocks:
• a first difference between a total number of remaining blockchain nodes of the blockchain network excluding the blockchain node requesting to be removed and a maximum number of faulty blockchain nodes tolerable by the remaining blockchain nodes,
• a second difference between a first number of the remaining blockchain nodes that store a dataset of information bits or redundant bits divided from an error correction coding (ECC) encoded version of the block and a second number of the remaining blockchain nodes that store a dataset of redundant bits divided from the ECC encoded version of the block, and
• whether the first difference is less than the second difference;
• retrieving blockchain data associated with the block from the blockchain node in response to determining that the first difference is less than the second difference;
• and
• allowing the request from the blockchain node to be removed from the blockchain network after the retrieving the blockchain data.

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• receiving a request from a blockchain node to be removed from a blockchain network;
• identifying a plurality of blocks associated with blockchain data stored by the blockchain node;
• determining, for each block in the plurality of blocks:
• a first difference between a total number of remaining blockchain nodes of the blockchain network excluding the blockchain node requesting to be removed and a maximum number of faulty blockchain nodes tolerable by the remaining blockchain nodes,
• a second difference between a first number of the remaining blockchain nodes that store a dataset of information bits or redundant bits divided from an error correction coding (ECC) encoded version of the block and a second number of the remaining blockchain nodes that store a dataset of redundant bits divided from the ECC encoded version of the block, and
• whether the first difference is less than the second difference;
• retrieving blockchain data associated with the block from the blockchain node in response to determining that the first difference is less than the second difference;
• and
• allowing the request from the blockchain node to be removed from the blockchain network after the retrieving the blockchain data.