The more miners that choose to support the network,
the harder and more expensive it becomes to create a
Bitcoin, thus providing a basis for a Bitcoin’s value,
as mining costs and time impact demand and supply,
thus value (Xu, y otros, 2016). Bitcoin was the first
cryptocurrency, and the system on which its tokens
work serves only for this type of tokens.
After Bitcoin, the universe of digital tokens
increased. With the introduction of Ethereum in 2015
came the concept of SC. The Ethereum blockchain
not only provided the infrastructure for transacting
primitive digital tokens, but also provided the
capability for easily creating and autonomously
managing other digital tokens of value over the open
public network without trusted intermediaries.
Ethereum and similar, can be considered a second-
generation blockchain. These platforms like Bitcoin,
enable its members to store information in a tamper
resistant, highly resilient, and non-repudiable manner
and have a native protocol token ether that reward
miners for generating valid blocks for the Ethereum
blockchain. Ethereum, however, intends to
implement a more energy efficient protocol of
consensus then proof of work, called proof of stake
(announced for implementation in January 2020).
Moreover, Ethereum goes one-step further
implementing ‘smart’ contracts capable of being self-
executed and self-enforced autonomously and
automatically, without intermediaries or mediators.
SC are ‘scripts’ (computer codes) written with
programming languages whereby the terms of the
contract are sentences and commands emulating the
logic of contractual clauses which enables anyone on
the network to execute actions. Ethereum requires
that users of the network seeking to execute a SC pay
miners a fee (called ‘gas’) for each computational
step in the SC. These fees are necessary for Ethereum
to run SC programs because, without them, members
of the network could choke the network with spurious
requests that would prevent SCs from executing. The
token, therefore, serves as a form of ‘crypto fuel’
needed for the network to operate. We can program
the creation of a token and associate its effects with
(1) the creation of new tokens or (2) specific rights
and obligations raised due to then SCs. Using this
concept of SCs, which are effectively applications
running on top a decentralized network, tokens can be
created and allocated to users, and made to be easily
tradable.
Initially, classification of tokens was unclear and
the process of issuing any type of token and
distributing them to users was called Initial Coin
Offering (ICO). Later, as most of the tokens offered
were classify by financial authorities as securities a
new term emerged, Security Token Offering, or an
STO. An STO is the proper term to refer to a token
crowd sale, in which consumers purchase blockchain-
based crypto tokens. Whereas ICO remains in use, it
is a dubious term referring to the sale of tokens, with
no clear distinction on the legal nature of the
underlying tokens, on the other hand, STOs make
clear reference to the sale of digital securities. Tokens
may be issued similarly to the issuance of financial
instruments. A security or financial instrument is a
contract, which represents an asset to the holder and
a liability to the issuer. The stocks, bonds, loans,
derivatives (options, swaps, futures ...) or even money
are financial instruments and tokens analogous to
these instruments are already being issued daily on
the internet and they are being financed (‘bought’)
mostly with Bitcoin and Ether. However, tokens may
be created to seed network effects tokenizing values
such as the user’s reputation within a system (e.g.
augur reference), an incentive to increase storage
space (e.g. Filecoin) or use tokens for on-chain voting
as a decision mechanism. Most applications or SCs
operate with tokens as means of governance. For
example, the decision-making process may rely on
having token holders vote according to the amount of
owned tokens (Ruiz, 2017), tokens such as Ethers,
ICONs or EOS may provide access to enhanced
functionality infrastructure. Thus, a token can fulfil
either one, or several of the following functions: (1)
A digital currency, (2) a digital right within a
blockchain ecosystem and (3) a digital security.
It is relevant for analysts, regulators and investors
to clearly separate and differentiate functionality and
rights when referring to tokens. As stated, we can
classify tokens into three main groups, payment
tokens, security tokens and utility tokens.
3.1 Payment Tokens
There are several attempts to define Payment tokens
across recent literature. Tu and Meredith (2015)
define Bitcoin, the as ‘a medium of exchange that is
electronically created and stored, and lacks the
backing of a government authority, central bank, or a
commodity like gold’. Sklaroff (2017) defines it as ‘‘a
cryptocurrency built using distributed ledger
technology (DLT) protocols to enable participants to
create, store, and exchange money itself’’. FinCEN
has stated that a ‘virtual currency is an exchange
mechanism that exists in electronic form and acts like
currency in some environments (such as electronic
transactions)’. However, payment tokens do not have
the attributes of legal tender in any jurisdiction
(Fisher & Kaplinsky, 2013; Goodwin Procter, 2014).