Themis
Themis
Token: GET


Decentralized “PayPal”

ICO dates
Start date: 2018-01-16
End date: 2018-01-27

Registrated in: UK

Platform: Ethereum
Type: ERC20

PREMIUM ICO

https://www.themis.network Screenshot
Themis categories
Cryptocurrency Smart Contract
Themis token sale
KYC passing required Yes | Whitelist Yes | Restriction for countries No
Price 1ETH = 15,000 GET
Themis news, social
Themis search trends in Google
Random whitepaper excerpts

1. OVERVIEW
................................................................................................................... 1
2. FAIR EXCHANGE IN DIGITAL COMMERCE
................................................................................ 4
2.1 T
RANSACTIONS
B
ETWEEN
D
IFFERENT
D
IGITAL
C
URRENCIES
............................................................................... 4
2.2 T
RANSACTIONS
B
ETWEEN
D
IGITAL
C
URRENCY AND
P
HYSICAL
G
OODS
.................................................................... 5
2.3 D
ESIGN
O
BJECTIVES OF
T
HEMIS
.......................................................................................................... 6
3. ARCHITECTURE OF THEMIS
............................................................................................... 8
3.1 T
HEMIS

1. Overview
Blockchain-based digital currencies are playing a radical
importance in today's trading activities. As a result, a variety of
digital currency exchanges were founded and their transaction
scales are exploding. At the same time with the rise of a tokenized
economy, more and more countries such as Japan, Germany, or
Australia, are accepting cryptocurrency payments. There is huge
potential that the market will continue to expand globally and accept
the commercialization of digital currency.
Figure1.1 Trend of cryptocurrencies
Currently, most digital currency exchanges and peer-to-peer
transaction providers focus on ensuring the security of transactions
but pay little attention to fairness. For example, HTLC (Hashed
Time-lock Contract), a widely-used atomic exchange technology, is
vulnerable to denial of service (DoS) attacks. Attackers may launch
DoS attacks in the period of time-lock to make the counterparty
unable to get refunded in a specific time.
THE...

Figure1.2 Requirements Analysis
Meanwhile, during the process of trading between the digital
currency and the goods, buyers prefer paying to the seller after the
goods are received, whereas the seller has an opposite preference
in mind. This situation makes the transaction and delivery unable to
be met at the same precise time, it can be persistent to achieve
atomic exchange with the guaranteed fairness. A common solution
is resorting to a trusted third-party to achieve fairness, however, this
solution is not entirely satisfactory due to previous failures. There
have been several Bitcoin exchanges and online markets (such as
Mt. Gox, Silk Road) that went down due to hacker attacks. For
decades, fair exchange protocols have been extensively studied.
However, the recent emergence of blockchain takes fair exchange
protocols to a renaissance.
THEMIS
2
...

Figure 1.3 Trusted Third Parties
We developed Themis
1
, a fair exchange system for digital
currencies. Based on blockchain technology, Themis provides a
decentralized digital currency escrow service to provide fair
exchange services among digital currencies, digital assets, and
physical goods. Themis leverages a novel group escrow protocol,
along with threshold encryption, anonymous reputation
mechanisms, non-interactive zero-knowledge proof, high
performance digital signature algorithms, in order to provide atomic
exchange with guaranteed fairness. Also, Themis is able to mitigate
DoS attacks, and provide privacy for all peers.
1
Themis is the most respected and trusted wife of Zeus's. As the goddess of law and justice, she is the creator and
guardian of order.
THEMIS
3
...

2. Fair Exchange in Digital Commerce
Fairly exchanging digital content is an everyday problem. A fair
exchange scenario commonly involves actors Alice and Bob. Alice
has something that Bob wants, and Bob has something that Alice
wants. A fair exchange protocol guarantees that at the end either
one of them obtains what (s)he wants, or neither of them does. In
digital commerce, it is a requirement to include fair exchange since
one or both of the parties are using digital currencies as subject
matter. For example, transactions between different digital
currencies, or transactions between digital currencies and physical
goods.
2.1 Transactions Between Different Digital Currencies
Traditionally, transactions between digital currencies are
executed on cryptocurrency exchanges. Exchanges achieve this by
creating internal accounts, which are also called IOU (I Owe You)
accounts. In this mode, it’s easy to achieve high transaction speeds,
However with the following issues; sec...

2.2 Transactions Between Digital Currency and Physical Goods
Current centralized coin exchanges and decentralized coin
exchanges are focusing on transactions between digital currencies,
but paying little attention to satisfy the requirements of fair
exchanges between digital currencies and physical goods.
During the transaction between digital currencies and physical
goods, it’s hard to achieve transaction and delivery at the same time,
thus the fairness of atomic exchanges face a challenge: a buyer
doesn't want to pay without assurance that the seller will ship the
purchased goods, while a seller doesn't want to ship without
assurance of that payment. Traditionally, a trusted third party is
required for hosting transaction funds and arbitration, and during the
period between transaction and delivery, the third-party needs to
host buyers’ transaction funds to
satisfy fairness. One common
solution of third-party payment is using the 2-of-3 multi-signature. In
this sc...

attacks. Even though the third-
parties can’t take the hosted funds,
they can also refuse arbitrating disputes, and lock the hosted funds.
2.3 Design Objectives of Themis
Themis is a decentralized system which provides third-party
escrow services and dispute resolution services to bring fairness to
exchanges in which one or both parties are using digital currencies
as subject matter. Technically, Themis should satisfy following
requirements.
Figure2.1 Objectives of Themis
Fairness
: After exchange, either both seller and buyer can
obtain all the goods (digital currencies, digital assets, physical
goods) they want, or they can obtain nothing (All-or-nothing);
Security
: None of the parities can transfer the digital funds
during the period of exchange;
Passivity
: If no dispute arises, there is no need for the third-
party to take part;
Correctness
: Ensure transactions and settlement of disputes
are executed by the protocol agre...

3. Architecture of Themis
3.1 Themis Blockchain
The Themis blockchain (aka. Themischain) is designed to
provide a third-party escrow service (like the role that Alipay plays
in online shopping). Themischain issues a token named Global
Escrow Token (GET). Themischain motivates the blockchain peers
by using an incentive mechanism which takes both deposit and
reputation into consideration. Peers who take active part in escrow
and arbitration will obtain a reward. When people use escrow
services and arbitration services provided by Themischain peers,
they pay GETs to the peers. And, if Themischain peers participate
in arbitration, they earn GETs as well. Themis makes peer-to-peer
fair exchange happen not only among digital currencies but also
between digital assets and physical assets by escrow contract and
arbitration contract.
Figure3.1 Architecture of Themis
THEMIS
8
...

Themis Roadmap

1
December 2016
Proposing the concept of Themis, starting market researching and business innovating. Starting the model design of decentrilized for exchange protocol.
2
August 2017
Publishing the Whitepaper of Themis, launching Themis website.
3
December 2017
Finishing the blockchain design of Themis, and finishing the development of group escrow protocol and anonymous reputation mechanism.
4
June 2018
Launching Themis 1.0 version. finishing the development of Themis Wallet 1.0, and supporting the scenarios of OTC trading and p2p escrow payment.
5
December 2018
Launching Themis 2.0 version, improving performance of Themis, supporting digital signature algorithm with hight-conncurency verification ability, finishing.
Daniele Bernardi
Daniele Bernardi
Donald Lawrence
Donald Lawrence
Professor of UCL SME in Capital Markets
James Johnson
James Johnson
former CIO Cantor Fitzgerald