March 2018
Beginner to intermediate
656 pages
20h 9m
English
Content preview from Mastering Blockchain - Second Edition
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Distributed Hash Tables
A hash table is a data structure that is used to map keys to values. Internally, a hash function is used to calculate an index into an array of buckets from which the required value can be found. Buckets have records stored in them using a hash key and are organized into a particular order.
With the definition provided earlier in mind, one can think of a DHT as a data structure where data is spread across various nodes, and nodes are equivalent to buckets in a peer-to-peer network.
The following diagram shows how a DHT works. Data is passed through a hash function, which then generates a compact key. This key is then linked with the data (values) on the peer-to-peer network. When users on the network request the data ...
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