The database shows the number of contributions with the #tanzaniadevelopmenttrust hashtag. The data is generated with osm-stats from American Red Cross.

#tanzaniadevelopmenttrust stats

Covered area in Tanzania: 120358 sq km 
Number of HOTOSM tasks: 118
Number of MapSwipe tasks: 10

EMPTY api-answer: No JSON received – is the API down?
Check the API-URL in the Block-Settings, please.
Use “/json-content-importer/json/gutenbergblockexample1.json” as example. You might switch on the debugmode on the right side.