Abstract: A method and device for issuing an identity certificate to a blockchain node in a blockchain network includes issuing a first identity certificate to a first terminal. a second identity certificate issuance request that is from the first terminal and that is made by using the first identity certificate is received and a second identity certificate is issued to the first terminal, which forwards the second identity certificate to a second terminal. A third identity certificate issuance request that is from the second terminal and that is made by using the second identity certificate is received and a third identity certificate is issued to the second terminal, which forwards the third identity certificate to a third terminal.

Abstract: An identity certificate may be issued to a blockchain node. The issuance may include issuing a first identity certificate to a first terminal and receiving a second identity certificate issuance request that is from the first terminal. A second identity certificate may be issued to the first terminal, and a third identity certificate issuance request is received from the second terminal. A third identity certificate is issued to the second terminal, so that the second terminal forwards the third identity certificate to the third terminal.

Abstract: A suspension apparatus for a superconducting magnet, comprising a support tray and at least two suspension assemblies. The support tray has at least one through-hole and comprises at least two mounting parts. The at least two suspension assemblies pass through the support tray via the through-hole. Each of the suspension assemblies is connected to one of the mounting parts. The suspension apparatus is easy to install. Furthermore, a superconducting magnet comprising the suspension apparatus, and a magnetic resonance imaging device, are also provided.