Coal mine specific gas chromatographUsed for precise detection of harmful gas concentrations such as CH ₄, carbon monoxide (CO), and carbon dioxide (CO ₂) underground (detection accuracy ≤ 0.01%), the data is directly related to coal mine ventilation safety and personnel life support. The detection data can be uploaded to the blockchain for authentication, which can solve the risks of data fraud and tampering through the "decentralized and tamper proof" characteristics of blockchain, while meeting the traceability needs of security regulatory departments. The core process needs to revolve around "data fidelity compliance on chain security traceability".

1、 Data collection: Ensure the authenticity and traceability of the source

The prerequisite for on chain certification is to obtain authentic and complete raw detection data, and to establish a trust foundation from the collection stage:

Data collection standard: Set a fixed collection frequency (such as 1 data every 10 seconds for real-time detection and 1 set of data per sample for offline detection), and each data should include three elements: "basic information+detection information+equipment information": basic information (detection time accurate to milliseconds, detection location such as "No. 3 Coal Seam 2101 Working Face", operator ID); Detection information (gas type, concentration value, detection error range); Equipment information（Coal mine specific gas chromatographNumber, calibration time, sensor status), to avoid missing key information that may render the certificate invalid.

Encryption of collection devices: Real time encryption of collected data is achieved through hardware encryption modules (such as the national security SM4 algorithm), and the data is directly transmitted from the instrument's built-in sensors to the mining security gateway (avoiding manual intervention). The gateway records data transmission logs (including transmission time and device IP) to ensure that the data is tamper proof throughout the entire process from generation to upload.

2、 Pre chain preprocessing: adapting to blockchain storage and efficiency requirements

The amount of coal mine detection data is large (up to one million per day), and it needs to be preprocessed before being uploaded to the chain to balance the efficiency and cost of certification:

Data compression and format standardization: using the JSON-LD standardized data format (for easy cross platform parsing), compressing duplicate fields (such as device number and detection location) (reducing redundancy through dictionary encoding), and controlling the volume of a single data entry within 500 bytes; Mark abnormal data (such as alarm data with excessive concentration) (such as adding the "ALARM" tag), prioritize on chain to ensure regulatory timeliness, and batch package regular data (once every 100) on chain to reduce gas costs.

Data Hash Digest Generation: Using the SHA-256 algorithm to generate a unique hash value (digest) for preprocessed data, only the hash value is linked to key index information (such as data ID, detection time range), and the original data is stored on the local mining server (in compliance with the data localization requirements of the Coal Mine Safety Regulations), which not only reduces the storage pressure of the blockchain, but also verifies the integrity of the original data through hash values (inconsistent hash values prove that the data has been tampered with).

3、 On chain certification: selecting blockchain and processes that are suitable for the scenario

Based on the privacy and regulatory requirements of coal mine data, choose an appropriate blockchain architecture and certification process:

Blockchain selection: Prioritize the use of a hybrid architecture of "consortium chain+private chain" - the consortium chain nodes include coal mining enterprises, local emergency management bureaus, and third-party testing agencies (to ensure multi-party supervision), while the private chain is used to store sensitive data (such as specific ventilation system parameters underground); The alliance chain can use domestically produced compliant chains such as Changan Chain and Qulian (which meet the requirements of Level 3 security), support ≥ 1000 transactions per second, and meet the speed requirements for real-time detection data in coal mines.

Design of storage process: 1. The mining gateway sends the preprocessed hash value and index information to the consortium chain nodes; 2. Node verification of data legality (such as verifying whether the device is within its validity period and whether the operator has permission); 3. After verification, the nodes sign the data and reach consensus (using PBFT consensus algorithm, consensus time ≤ 3 seconds); After successful consensus, the data is written into the blockchain block (generating a unique block height and transaction ID), and at the same time, a deposit notification is pushed to the regulatory platform (such as the emergency management bureau receiving real-time alarm data deposit information).

4、 Security and Compliance: Ensuring the Legitimacy of Data and Blockchain Applications

Coal mine data involves both safety production and privacy, requiring a balance between technical security and regulatory compliance

Data security protection: Blockchain nodes are deployed in mining explosion-proof rooms (compliant with Ex d IIC T6 explosion-proof level), and communication between nodes is encrypted using SSL/TLS (to prevent data transmission from being overheard); Operators can access the blockchain authentication system through USB Key authentication (supporting two factor authentication) to avoid unauthorized operations.

Compliance guarantee: The stored data must comply with the "Management Specification for the Use of Coal Mine Safety Monitoring Systems and Testing Instruments" (AQ 1029-2019) to ensure traceability of information such as testing time, location, and equipment status; Regularly compare the on chain certification data with local raw data (once every quarter), generate compliance reports and submit them to regulatory authorities, while retaining blockchain transaction records (at least for 5 years) to meet the data retrieval needs for accident tracing.

Through the above scheme,Coal mine specific gas chromatographThe detection data can achieve "traceable source, traceable process, and tamper proof results", which not only provides data trust support for coal mine safety production, but also provides reliable basis for regulatory departments to accurately supervise and trace accidents, and helps to accurately prevent and control gas safety risks such as coal mine gas.