1. The importance of digital evidence and the difficulty of preserving it
Internet technology is booming, and mobile devices are occupying most of the lives of modern people. As people's lifestyle changes, the place or method of crime is no longer limited to the physical world, and the proportion of
crime in the virtual world is growing. When a perpetrator commits a crime through mobile phones, computers, and network equipment, although "everything has to leave a trace", the search and preservation of digital evidence
also needs to be accompanied by technological changes.
Digital evidence in the virtual world is not directly perceived and managed like traditional evidence. Digital evidence is stored in device equipment. This is unlike
physical evidence, where it can be stored and monitored in the physical space. As a result, digital evidence is more difficult to control. In the process of transferring evidence, it may be tampered with by unauthorized actors
or external intruders. This could result in the reading, copying, altering, or even deleting of the digital evidence, thus often bringing digital evidence's evidential strength under question.
2. Blockchains's attributes can effectively address the difficulty of maintaining digital evidence's evidential strength.
Blockchain, through its attributes, happens to effectively solve the problem of the digital evidence's evidential strength. Bitcoin began to gain popularity in 2009, after which blockchain gradually got noticed. Blockchain is a
system of decentralized and distributed records. Possessing certain important attributes enables it to address many doubts about the above-mentioned digital evidence. The following briefly describes blockchain's attributes
and the problems they solve:
1. Decentralization - Distribute storage of digital evidence so to eliminate risk of information loss Through multiple nodes' independent operations storing the same data, no central management
unit or mechanism is needed. The algorithm is used to synchronize the data and store it on multiple nodes ensuring the security of digital evidence storage.
2. Tamper-Proof - Digital evidence integrity and accuracy Once
the data is written to the blockchain, it is permanently stored there and will not be modifiable. In addition, after writing to each block is completed, the hash value of the block will be written to the next block and gets
synchronized to all nodes. Therefore, if the original digital evidence gets modified, its hash value can easily be verified. This way, the integrity and accuracy of the digital evidence can be confirmed.
3. Public Chain Anchoring - Digital evidence full transparency Public Chain Anchoring - Digital evidence full transparency In order to eliminate any doubts about the private chain's transparency, we anchor a fixed number
of digital evidence records to the public chain so to confirm their time sequence. If there is a mismatch with the past blocks' data, we will then know the information has been tampered with.