March 2018
Beginner to intermediate
656 pages
20h 9m
English
Content preview from Mastering Blockchain - Second Edition
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World state database
World state reflects all committed transaction on the blockchain. This is basically a key-value store which is updated as a result of transactions and chaincode execution. For this purpose, either LevelDB or CouchDB is used. LevelDB is a key-value store whereas CouchDB stores data as JSON objects which allows rich queries to run against the database.