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Last Updated: Jan 17, 2019
  1. Are transactions stored in real time?

    A: Unlike traditional transactional databases, transactions are asynchronous in blockchains. Up to 25,000 notary transactions can be made every second.

  2. Is it synchronous with relational databases?

    A: It subscribes to block notifications and pulls notifications on demand from the blockchain. Or it uses the business view system.

  3. Are public and private keys legally recognized?

    A: The certificate is a legally-recognized certificate that Alipay uses to access a third party.

  4. What method is used to protect data privacy?

    A: To protect notary data privacy, data is encrypted and only authorized users can decrypt data.

  5. The client has been initialized successfully but can not comminicate with the blockchain, I also found the error log below, may I ask why is this happening?

    1. connect to / success!
    2. old is not null, async resend subscribe events

    A: Usually this happens because of mistakes in the client configurations, please make sure you use the right private key file, password and certificate file.

  6. How can I create private keys and certificate requests in Windows?

    A: In Windows, use the OpenSSL tool to create private keys and certificate requests.

    We recommend that you go to and download OpenSSL ver1.0.2o instead of OpenSSL ver1.1.0, which has a known bug when extracting private keys.

    The following are two backup links:

    1) 1) OpenSSL (32-bit):

    2) OpenSSL (64-bit):

    Use OpenSSL to create private keys and certificate requests by:In cmd, go to the path of Openssl.exe:cd Openssl_path

    Configure the OpenSSL configuration file under the current path.set OPENSSL_CONF=openssl.cfg

    Generate private keys and corresponding certificate requests under the current pathopenssl req -newkey rsa:2048 -keyout key_pkcs10.pem -out csr.pem

    When running this command, you will be prompted to enter the following information:

    1. Country name (2-letter code): Enter a two-letter ISO country code. For China, enter CN.
    2. State or province name (full name): Enter a province, for example, Shanghai.
    3. Locality name (for example, city): Enter a city, for example, Shanghai.
    4. Organization name (for example, company): Enter an organization, for example, Pinyin of a company name.
    5. Organizational unit name (for example, section): For example, IT Dept.
    6. Common name (for example, your website domain name): Enter an identity used for SSL encryption.
    7. Email address: email address (optional)
    8. Challenge password: (optional)
    9. Optional company name: (optional)

    Convert private keys from pkcs10 to pkcs8

    openssl pkcs8 -in key_pkcs10.pem -inform PEM -out pkcs8.pem -outform PEM -topk8