A common term that describes the process of using a device to illegally gain access to a third-party individual’s computer.


The term refers to an event wherein the total rewarded bitcoins per confirmed block is reduced to half of its former size.

Hard Cap

It is the total amount of money that a particular ICO seeks to raise by the end of its scheduled lifecycle.

Hard Fork

A hard fork is a change to the blockchain protocol that makes previously invalid blocks/transactions valid, and therefore requires all users to upgrade their clients. The most recent example of a hard fork in public...


The act of performing a hash function on input data of arbitrary size, with an output of fixed length that looks random and from which no data can be recovered without a cipher. An important property of a hash is that...

Hash cash

is a proof-of-work system used to limit email spam and denial-of-service attacks, and more recently has become known for its use in bitcoin (and other cryptocurrencies) as part of the mining algorithm. Hash cash was...

Hash Function

A mathematical function that turns data about transactions into an unrecognizable string of letters and numbers, thus encrypting it. Hash functions are used in the verification of transactions and mining.

Hash Power

Also referred to as Hash Rate, it is a term that is used to measure the total computing power used by a blockchain network to work in an uninterrupted, continuous manner.

Hidden Cap

It refers to an undisclosed sum of money that ICO projects elect to raise through their backers.


Cryptocurrency investors developed the term “HODL,” which stands for “hold on for dear life.” The acronym originally came from a misspelling of the word “hold.”[9] Digital currencies...

Hosted Wallet

It is a crypto wallet that is managed by a trusted third-party entity.

Hot Storage

It is a type of online storage system that makes use of private keys to allow users to gain quick access to their digital holdings.


It is a project launched by the Linux Foundation in 2015. It comprises a number of open-source blockchains and other similar tools.