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 multi-lens video camera module includes a holder shell having a planar mounting surface and a plurality of tilted mounting surfaces equiangularly spaced around the periphery, a plurality of lenses respectively mounted in the planar mounting surface and tilted mounting surfaces of the holder shell with respective mounting plates, a PC board mounted in the holder shell and carrying an image synthesis processor IC, flexible flat cables electrically connecting the lenses to the PC board for enabling each lens to transmit a signal to the image synthesis processor IC for image synthesis processing. Thus, by means of calibrating one lens to obtain lens parameters, the other lenses can be rapidly calibrated by a computer using the lens parameters obtained.