WebSocket 执行数据中 timestamp 与 transactTime 的区别在于：
transactTime（交易时间）： 原始交易发生的时间，在随后的更新中保持不变。
timestamp（时间戳）： 反映执行数据最近一次更新的时间。
如果执行数据在初始交易后被修改，timestamp 可能会与 transactTime 不同。
This website is operated by HDR Global Trading Limited, a company incorporated under the International Business Companies Act of 1994 of the Republic of Seychelles with a company number of 148707 and registered address at Global Gateway 8, Rue de la Perle, Providence Mahé, Seychelles (“HDR”). HDR wholly owns BitMEX, a Bitcoin-based trading platform.
Access to trading or holding positions on BitMEX is prohibited for any person or entity that is located, incorporated or otherwise established in, or a citizen or a resident of: (i) the United States of America, Québec (Canada), the Hong Kong Special Administrative Region of the People’s Republic of China, the Republic of Seychelles, Bermuda, Cuba, Crimea and Sevastopol, Iran, Syria, North Korea or Sudan; (ii) any state, country or other jurisdiction that is embargoed by the United States of America; or (iii) any other jurisdiction where the services offered by BitMEX are restricted (collectively “Restricted Jurisdictions”). If it is determined that any BitMEX user has given false representations as to their location, incorporation, establishment, citizenship or residence, or HDR detects a user is from a Restricted Jurisdiction as described above, HDR reserves the right to immediately close their accounts and liquidate any open positions. HDR may, in its sole discretion, implement controls to restrict access to the BitMEX trading platform in any of the Restricted Jurisdictions.