Instead they are created by the system's network when a specific amount of computer work, known as a "block" has been completed.

BBC: Rewards set to halve for digital money miners

The program completed 100 percent of its milestones for Block 10 testing and the Block 10 is deployed today.

CENTERFORSECURITYPOLICY: Center for Security Policy | SUMMARY OF THE CENTER FOR SECURITY POLICY��S SECOND HIGH-LEVEL ROUNDTABLE ON THE FUTURE OF THE MANNED BOMBER FORCE

The main tower block was due to be completed shortly.

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The completed and fully operational rebuild is now in Block H of the museum, on the spot where Colossus No 9 stood during the war.

BBC: Colossus

The aircraft currently being tested are Block 10 aircraft -- they are not designed to have the full Block 30 capabilities until subsequent retrofits are completed.

CENTERFORSECURITYPOLICY: Center For Security Policy

Fifty bitcoins are released when that block is done and the work, which involves solving a hard mathematical problem, is completed.

BBC: Rewards set to halve for digital money miners

In 1996, Arquitectonica completed the "Chia Pet, " a garage with six levels of parking plopped on top of a historic block of buildings and shrouded entirely in greenery, and earned rave reviews.

WSJ: A Sleek, Chic Hangout ... the Parking Garage