Hacking is the process of using a computer to manipulate another computer or computer system in an unauthorized fashion.


An event in which the total rewarded bitcoins per confirmed block halves, happening every 210,000 blocks mined.

Hard Cap

The maximum amount that an ICO will raise. If a hard cap is reached, no more funds will be collected.

Hard Fork

Hard Fork is a type of protocol change that validates all previously invalid transactions and invalidates all previously valid transactions. This type of fork requires all nodes and users to upgrade to the latest version of the forked protocol software. In a hard fork, a single cryptocurrency permanently splits into two, resulting in one blockchain that follows the old protocol and the other that follows the newest protocol. Some examples are Bitcoin and Bitcoin Cash, or Ethereum and Ethereum Classic. 


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 the output of hashing a particular document will always be the same when using the same algorithm.

Hash Function

Any function used to map data of arbitrary size to data of a fixed size.

Hash Power / Hash Rate

A unit of measurement for the amount of computing power being consumed by the network to continuously operate. The Hash Rate of a computer may be measured in kH/s, MH/s, GH/s, TH/s, PH/s or EH/s depending on the hashes per second being produced.

Hidden Cap

Hidden cap is an unknown limit to the amount of money a team elects to receive from investors in its Initial Coin Offering (ICO). The purpose of a hidden cap is to even the playing field by letting smaller investors put in money, without the large investors forming an accurate understanding of the total cap and adjusting their investment as a result.

Hierarchical Deterministic Wallet (HD Wallet)

A wallet that uses Hierarchical Deterministic (HD) protocol to support the generation of crypto-wallets from a single master seed using 12 mnemonic phrases.


A type of passive investment strategy where you hold an investment for a long period of time, regardless of any changes in the price or markets. The term first became famous due to a typo made in a bitcoin forum, and the term is now commonly expanded to stand for “Hold On for Dear Life”.

Hosted Wallet

Hosted Wallet is a hosted crypto wallet is a digital wallet in which your private keys are stored. In exchange, the wallet takes care of the backup and security of your funds.

Hot Storage

The online storage of private keys allowing for quicker access to cryptocurrencies.

Hybrid PoW/PoS

A hybrid PoW/PoS allows for both Proof-of-Stake and Proof-of-Work as consensus distribution algorithms on the network. This approach aims to bring together the security of PoW consensus and the governance and energy efficiency of PoS.

Hyperledger (Hyperledger Foundation)

Hyperledger is an umbrella project of open-source blockchains and blockchain-related tools started by the Linux Foundation in 2015 to support the collaborative development of blockchain-based distributed ledgers.