A network of computers can confirm the transaction.
Cylindrical "forearms" house small electric motors, known as actuators, which pull on metal tendons that move the fingers with precision.
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南方周末：在这些关键时间点，都发生了什么具体的事情？
Its recent trial of age checking software by Persona in the UK has attracted some scrutiny over the vendor's backing by an investment firm co-founded by Peter Thiel, boss of controversial US data firm Palantir.
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