IoT–smart contracts in data trusted exchange supplied chain based on block chain

International Journal of Electrical and Computer Engineering (IJECE)
Vol.10, No.1, February 2020, pp. 438~446
ISSN: 2088-8708, DOI: 10.11591/ijece.v10i1.pp438-446  438
Journal homepage: http://ijece.iaescore.com/index.php/IJECE
IoT–smart contracts in data trusted exchange supplied chain
based on block chain
S. Ganesh Kumar, B. Sriman, A. Murugan, B. Muruganantham
Department of Computer Science and Engineering, Faculty of Engineering and Technology,
SRM Institute of Science and Technology, Chennai, India
Article Info ABSTRACT
Article history:
Received Feb17, 2019
Revised Aug 23, 2019
Accepted Aug 30, 2019
Internet of Things (IoT) assumes a critical part in the advancement of
different fields. The IoT data trusted exchange in recent year extend of uses
influence an awesome request and increasing scale. In such a platform,
exchange the data sets that they require and specialist organization can
search. However, the enough trust as the third-party mediators for data
exchange in centralized infrastructure cannot provide. This paper proposes a
blockchain for IoT data trusted exchange based on decentralized solution. In
particular, the fundamental standards of blockchain in verify manner,
individuals can communicate with each other without a confided in mediator
intermediary. Blockchain enable us to have a distributed, digital ledger. IoT
(Internet of Things) sensor devices (zigbee) utilizing blockchain technology
to assert public availability of temperature records, tracking location
shipment, humidity, preventing damage, data immutability. The sensor
devices looking the temperature, location, damage of each parcel during the
shipment to completely guarantee directions. In blockchain all data is got
moved from one position to another, where a smart contract assesses against
the product attributes. Ethereum blockchain and smart contracts atlast it gets
through knowledge a design to be copied and presents its decentralized
distributed digital ledger, auditable, transparent, features visually.
Keywords:
Blockchain
Datatrusted exchange
IoT (internet of things)
Smart contracts
Copyright © 2020 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
S. Ganesh Kumar,
Department of Computer Science and Engineering,
Faculty of Engineering and Technology,
SRM Institute of Science and Technology,
Chennai, India.
Email: 13ganesh@mail.com
1. INTRODUCTION
Internet of Things (IoT) and Blockchain are viewed as rising ideas and technologies [1].
In the meantime they change ideas and make new conceivable outcomes, each in their particular situations,
and there is a chance to make applications that can share the inborn attributes of both, investigating how
the IoT can profit by the decentralized idea of the Blockchain. The forward development of exchange and
networking technologies (e.g., Wi-Fi, Zigbee, Bluetooth), a developing more complete number of things
(e.g., sensors, actuators, smart devices) are being associated Internet these days, are being connected to
the Internet these day (IoT).
Blockchain [2-5] basically a distributed, digital ledger [6] has numerous applications and can be
used for any data exchange, agreements/contracts, tracking and of course, payment [6, 7]. Since every bit of
transaction is recorded on a block and across number times another copies of the ledger that are made
distribution over many nodes (computers), it is highly transparent. It’s also profoundly safe since each block
makes connection to the one going in front of it and after it. There is not one focal being of the opinion that
over the blockchain [2], and it’s to a great degree working well and turning readily to another work.

Int J Elec & Comp Eng ISSN: 2088-8708 
IoT–smart contracts in data trusted exchange supplied chain based on block chain (S. Ganesh Kumar)
439
In the end, blockchain can make the power and transparency of supply chains and decision act on everything
from warehousing to delivery taken to payment. Chain of need is basic for some things, and blockchain has
the chain of need made in. Gained recently attention with [8] Smart contracts, particularly with in connection
with to the blockchain technology.
Selected before the rules, blockchain technology that can verify [9] its correctness and support in
smart contract (agreement) hence, its a self-implementation and self- executing. However, at all base
platform without a right base platform a smart contract is not “smart” to run, execute and check these
contracts it need such a base platform. A smart contracts that can work in a decentralized manner and
completely self-ruling, such a base platform is blockchain. Financial services [10] (e.g., Bitcoin) or general
services e.g., (Ethereum) [11, 12] can be used smart contract. A blockchain [4] executes, checks, and gathers
and stores smart contracts in blocks. Every block has a statement, direction to atleast one person who had
the position before, for this reason the limited stretch of time blockchain [13]. Blockchains are decentralized,
distribute ledger, [7] based on cryptograph. A main interest in the financial industry for using blockchains is
to put machines to use and digitalizing forms particularly when great number of a number of persons working
together are covered. These agreement can be assessed naturally smart contract with blockchain utilizing
the primary advantage.
Current solutions produce that needs to be checked manually using smart contracts, the temperature
indicators, tracking shipping, preventing shipping damage can be assesses automatically and notify sender
and one who gets package. In addition, it is tamper-proof for the stored data and are used for looking over of
account by expert by outside groups of persons. By using the Ethereum [11, 12], it is fully decentralized as
tamper-proof, framework utilized by the requiring little to no hard work and on a for every contract and per
byte premise.
The remaining sections will explain the upcoming topics. The second part, Internet of Things (IoT)
zigbee based technology wireless sensor network (WSN) discovered shipping damage indicators, temperature
indicators and tracking shipping. Section III Blockchain enables the work of art of smart contracts, with
terms and conditions both sides can give details and that say without doubt have trust in the enforceability of
the contract and the mind and physical qualities of the counterparty. Section IV outlines the special technical
details, which is had followed by a first stage put value evaluation, while Section V provides conclusions.
2. ZIGBEE BASED TECHNOLOGY (WSN)
Many applications that used in the great numbers today are GPS. Tracking is one of the applications
in shipping or Any Portable Device and monitored regularly. The routs travelled and the exact locations of
the information given by this tracking system, which are embedded in this hardware. Moreover, by that given
information the user can locate the different places widely. In any of the weather conditions, the systems are
enabled to track the target routes. For this, the Zigbee technology and the GPS are used. Similar to this,
the landwide shipment tracking used similar to the GPS is represented. This type of the systems enable at
the same time for the required Equipment’s to be tracked, which are accurate, long lasting, light in weight
and are cheaper than any of the automatic positioning tags. In any devices, the sensors are built into
the compactness of the prototypes, which are open structure designed for tracking the shipments.
By using the Google Maps, the GPS and the API working: the information are sent over the network to
devices like mobile phones which are embedded with the simple Zigbee technology for tracking the device
shipments. Whenever, it is limiting to the particular person with an adjusting alert message to the receiver for
tracking. The battery powers are saved and the tracking costs and the feasibility results and then doing
the power efficiency of the battery and the transmission of the data. Now a day’s technology is growing
higher and higher good level, because of this, the common people are ready to take up these technology
facilities in their daily life. In their day to day living groups of person are demanding to protect their
instruments, devices etc. by using available resources. Hence this project is made on the platform of this
demand. Required components are:
1. Arduino.
2. GSM GPS Module.
3. 16×2 LCD.
4. Power Supply.
5. Connecting Wires.
6. Zigbee

 ISSN: 2088-8708
Int J Elec & Comp Eng, Vol. 10, No. 1, February 2020 : 438 - 446
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2.1. Arduino UNO ATmega328
Microcontroller board based on the AT mega328 (data sheet), hardware, software with the open
source computers by the Arduino Uno. It consists of the 14 numbers with the digital input/output pins (6 used
as PWM outputs), 6 inputs as the analogs, and a 16 MHz ceramic resonator, with the power jack, an ICSP
header, USB connection and the button to start. The support for the micro controller provided, to make
connection to the knowledge for processing machine to an USB subscription, or turn it on with the AC to DC
for making the adjustment connector for producing electric current to initiate. It uses the FTDI USB to serial
driver chip, so only it is different from all the process boards. Inspite of this, it uses the Atmega 16U2
(Atmega8U2 up to R2) of the knowledge processing machine orders which are listed as USB to the serial
converter. Figure 1 show the arduino UNO R3.
Figure 1. Arduino UNO R3
The Uno board that has a resistor version of Revision 2 that pulls the 8U2 HWB that get onto
the land, which makes it easy to put them into the DFU of most frequent number. The board version of
Revision 3 has the new upcoming features. The SCL pins are near to the RESET pin, 1.0 pinout: added
the SDA [14] and the new other two pins are safely placed near the RESET pin. The safety shields are
allowed to adjust to transmute the voltage that are provided from the board by the IOREF. The safety shields
that are able to exist together are AVR used by the boards that operates with 5V and with Arduino [14] duo
which are operated with 3.3V. The remaining pins are kept unconnected for the later purpose.
a. The circuit is stronger in RESET.
b. ATmega [14] 16U2 that gives another in place of 8U2.
“Uno” is a way one in Italian. The direction accounts of Arduino, moving forward in the Uno and version
1.0. The Uno is the latest in a number, order, group, line of USB Arduino boards, and the statement, direction
scaled copy model for the Arduino platform.
2.2. GPS-GSM module (SIM 808)
GPS-GSM[15] part of a greater module unit (SIM808) part of a greater module unit is a well-
constructed complete Quad- Band GSM/GPRS part of a greater module unit which grain processing
machines combines GPS technology for one dependent on keeping satellite navigation. The package which
mixed together GPRS and GPS in a SMT will importantly for both cost and time application enabled GPRS
growth develop to customers. GPS purpose use, it let not fixed in level properties to be with ways, roads,
lines without breaks tracking at any place and any time with amount signal coverage in feature an industry.
2.3. LCD 16x2
LCD [16] (Liquid Crystal Display) is discover a wide range applications and screen is an electronic
exhibit module. A 16x2 LCD is used in different circuits and device and basic part of greater module unit is
exhibit. These parts of a greater module unit are supported over seven part and othermore than one or two
part LEDs. The reasons being: LCDs are money related; easily able to be made into list of machine orders;
have no limiting condition of displaying special & even tax on goods coming into country characters (unlike
in seven part), animations and so on. Figure 2 show LCD 16x2. The receiver part of a greater module unit is
activated when its within the range of transmitter part of a greater module unit. Which is decoded and send
message to the LCD [16] screen (Pin D4 to D7) to display the true statement message (Part of a greater
Module unit is Found). If the receiver is in the range of transmitter part of a greater module unit then Zigbee
module activated and sends the true statement signal to Arduino (Pin 2 DATA to D12).

441
Figure 2. LCD 16 *2
2.4. Power supply
Power supply device for the make into different sort of ready (to be used) power of one group of
qualities to have meeting with given details of requirements of a certain sort power supplies of application
getting changed includes raw controlling the input power and/or operation of current for the electronic
equipment and/or made voltage fixed.
2.5. Zigbee
Zigbee [15] is a wireless communication standard for low cost, low rate, low power, which can to be
used far away, widely different control applications, likes smart home automation, smart cities, smart
packing, smart health care system as shown in Figure 3. Zigbee quality example has been designed to offer
least possible, recorded price and power to make connections for devices which have need of electric current
from several years, and several months life for time ranging. Zigbee has based on the RF general condition to
the looked on to come to cover 10-70 meters and given application output is required. The three main
components are in Zigbee network as shown in Figure 4 zigbee based networks like routers (ZR) and person
giving directions (ZC), End-devices (ZED) [15].
Figure 3. Zigbee Figure 4. Zigbee based networks
a. GHz Radio frequency band.
b. 250 kbit/s Data rate.
c. 16 (802.15.4 Channels 11 to 26) Number of channels.
d. 2 analogue I/O ports and 12 general purpose I/O port inputs.
e. 100–300 meters Typical distances.
A network component is done or not in the router. In participates and coordinator it may associate
with in the message of multi- hop routing. Makes connection to one person giving directions or router and
low power operation which made for end–device in finally. Each Zigbee network need only one person
giving directions and it starts the network structuring. Zigbee is to guide and get fixed by the signing
the Detected location when the receiver part of a greater module unit is in the range of Zigbee transmitter.
The GSM send the put into signs co-ordinates to Cell phone and comes back a sign put out to [16] Arduino
(Pin D0) for the make up of operation completed. At the same time the Arduino activate the Zigbee
transmitter part of a greater module unit (Pin D12) [17] till the operation completed and provides the 5 V
supply. The receiver part of a greater module unit is activated when it’s within the range of transmitter part of
a greater module unit. Which is decoded and send message to the LCD screen (Pin D4 to D7) [17] to display
the true statement message (Module is Found).
If receiver is in the range of transmitter part of a greater module unit then Zigbee part of a greater
module unit activated and sends the true statement sign put out to Arduino (Pin 2 DATA to D12).

 ISSN: 2088-8708
442
We can unbroken brands over wheels the taker (property of another) readily or any device by coming here
after sensed co-ordinates (Latitude and longitude) and make clear the location by detecting the separate
Zigbee sign put out received from the taken (property of another) device. Zigbee Wireless Network: This is
the part which physically doesn’t currently in existence. It is chiefly of the wireless communication between
the Zigbee part of a greater modules attached to the Transmitter and Receiver Arduino board and
microcontroller board.
3. BLOCKCHAIN IN SUPPLY CHAIN MANAGEMENT AND LOGISTICS
The essential fields in Block chain appropriation nowdays is the Logistics and the supplied chain
industry [5, 7, 18]. Different enormous are looking into the implementation of blockchain [2, 3] for the easy
communication process of delivers and makes the supply chain [10] traceable and efficient. This changing
technology is very much helpful for tamper-proof, and tracking the product of anything begins from tomatoes
to diamonds [4]. From order tracking to dispute resolution, blockchain has the response to every problem that
has been plaguing the logistics industry for long time. Figure 5 shown Supply chain management in
blockchain.
The information flow in current goods is highly complicated, includes many parties, and includes
heavy documentation [19] (payments, receipts, settlements, etc.). Monitoring every single exchanges and
documents is a cumbersome job and sometimes important documents gets of transparency in the present
supply chain system. Also it’s extremely difficult to investigate if there is happening of any illegal or
dishonest practices in the system lost or manufactured, which creates confusion in the system, leading to
huge loss.
Figure 5. Supply chain management in blockchain
Previously, supply chains were moderately easy and simple because commerce was local, but now
it’s done globally, which makes it incredibly unpredictable. Due to globalization, in between the parties
(clients, vendors and the suppliers) may get some more days to be processed, when the review of
the contracts are done by the brokers and the lawyers comes with the additional for the delay and the cost.
It is considered as unsafe of the goods that are passing through several places geographical locations
(international / national) to the destinations that are done with the agreements [20]. It is very hard for tracing
where the goods are coming from and where it is as, as those documents about the details may be forged or
lost. Now, it is exceptionally for clients/buyers to really gather the information or the products value and
the origin of the items, in the supply chain system, there may be lack in the product transparency.
Due to high complexity and lack of transparency in the current supply chain, business people are
anxious to explore the possibilities of blockchain [2] technology to transform the supply chain and logistic
industry [21]. The records about the digital data [22] or the events are stored in a Distributed Ledger called
the Block Chain [2]. It is a database that contains transactions details, information & records called blocks.
These blocks hold incorruptible trust due to its highly secured nature. It offers a compelling solution by
combining accessibility with security and privacy.

443
In this Globalized world, it is a difficult process to do the supply chain and it likes to be critical
compared to others. Today there is a significant amount of trapped value in logistics, mostly stemming from
the competitive and fragmented nature of the logistics industry. This frequently makes low transparency, data
warehouse, unstandardized processes, and different levels of technology appropriation.
3.1. Trackability and transparency
Adopting blockchain [23] in supply chain could support trust, enhanced transparency, and
predictability by enabling clients to track where a shipment/ order is at any given time [14].
3.2. Automation
Use of smart contracts will enable companies to automate their purchasing process, which leads to
cutting costs and saving time. Smart contract will also improve the transaction flow and security in the supply
chain.
3.3. Accessibility
Ulilizing blockchain [2] dealers can store their product origin, place of storage, authenticity [24],
product certificates and record, etc. on a single ledger. All of the important information being in one place
will make accessibility data much more easier, which not only create more transparency in the supply chain
but also helps in decreasing the amount of frauds and goods robbery that happens.
3.4. Security
Since a blockchain [3] is an unchanging distributed ledger, changes in ownership and possession of
goods at any point could be entered into the ledger permanently and instantaneously. As the blockchain
technology is cryptographically secured and is decentralized, shipping, possession and ownership of data
could be better protected from altering or hacks.
3.5. Quick payments
Implementing blockchain [2] technology to the payment system could help in reducing grating in
commercial financing, accordingly disposing exchaning debate.
3.6. Saves cost and time
Transport suppliers will have the capacity to information about availability of storing capacity and
routes, which will decrease transport costs and time. Clients can know the origin of the products,
manufacturer, date, time, etc,.
4. SEQUENTIAL DIAGRAM
Ethereum Blockchain Network [3] is used to verify temperature, tracking shipment data recorded
listed in the front-end. Smart contracts written in the contract oriented programming language (solidity), [8]
run in a virtual machine, called Ethereum [11, 12, 25]. The Figure 7 show sequential diagram the blockchain.
Figure 7. Sequential diagram

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Virtual Machine (EVM) giving power to the verification of data by smart contracts.
a. Smart Contract: is give out for each new shipment, being responsible for making certain the doing as
requested of temperature data, tracking shipment data that is connected with the shipment.
b. Mobile Devices: Devices used by the end-users to register new shipments and track/send records of
temperature data to the computer application [15].
c. Sensors: sensitive devices able to exist together with Zigbee technology configured to send data in a fixed
polling space times between to a Mobile Device.
5. TECHNICAL DETAILS
In the back-end, the temperature, tracking shipment doing as requested made certain by smart
contracts written with Solidity, a high-level language designed to compile code for EVM. Each and every
product with the groups or the newly agreed shipments always has the particular requirements for
the temperature. The GDP compliance requirements ensured to do the smart contract for tracking are
deployed and configured.
The changes occurred in the smart contracts and the participation of the [11, 12] Ethereum networks
are done by the Ethereum nodes [26], that initiates the new contracts functions. The communication by
the Ethereum nodes by the HTTP (Hypertext Transfered Protocol) over the JSON (JavaScript Object
Notation). The ranges of the temperature are verified by the smart contracts and are storing the verified
outputs with the hash values in the smart contracts.
The encoding and the decoding for the Android clients for communication with the PC,
REST (Representational State Transfer), API (Application Programming Interface)[27] are done by the using
the JSON [9]. The users with the mobile phones register for their every new shipment with all their
regulatory, in which the contract for every new shipments are created. The recent updates of the temperature
records by the Zigbee to the PC or the devices should be allowed by the API. The awareness about
the contract results should be known to both sender and the receiver, moreover they should be granted
permission to access the measurement of the temperature and the tracability, mainly by using the Graphical
Visualization.
The Back-end offered by API can be used in different front-end applications in addition to
a smartphone or tablet. For example, one could use a Web application in word used for joining other words,
statements with the mobile devices to register doing has requested data of new shipments and verify their
separate states on the run. Therefore, one could help from quicker ways to input doing as requested data in
contrast with a smartphone or tablet. However, the logistics managing general condition has need of a high
mobility of devices reading the sensors, or to register one or many number barcodes at several points of
the end-to-end process. Temperature data, tracking location data, preventing damage data is on condition that
by IoT sensors by Zigbee device that can be placed in strategical points of the shipment. The sensor has both
identification and sensing power which allows to exchange ideas the right in details time to temperature
measuring, tracking shipment in specific points.
Temperature looking and tracking shipment location at is started point with the Android client.
To start the process, a sensor device needs to be within range. As a first step, a track-and-trace number,
which is representatively discovered on the packet, has to be connected with the MAC-address of the sensor
device. Since both, track-and- trace number and MAC-address are barcodes, respectively QR-codes,
the Android client captures both with its camera. After this process, the Android client starts via Zigbee
the temperature measurements and tracking location on the sensor device, and sends the track- and-trace
number/MAC-address association to the computer. The sensor also stores the track-and-trace number in case
no computer access is provided. Thus, a sending package that has been, always has an association between its
MAC-address and the current track-and-trace number. The computer stores the association and makes create
existence, broadcasts the smart contract, and stores the smart contract ID on the sensor device.
Now the sensor device can be placed inside the products packet. The sensor device is recording every 10
minutes the temperature and stores it in the internal memory on the Zigbee sensor device.Scanning the track
and trace number after receiving the packet at the destination. The Android client requests the MAC-Address
from the computer to connect to the sensor device [15]. Then the Android client automatically downloads all
temperature data, tracking location details and sends it to the smart contract. Once the smart contract checks
the temperature, track location anyone interested in that smart contract can verify if the temperature, track
was within its specifications directly on the [11, 12] Ethereum blockchain [11, 12]. Thus, the sender will be
notified immediately on such result.

445
6. SUMMARY, CONCLUSIONS, AND FUTURE WORK
Many financial-related start-ups are looking into block chain-based answers in order to get changed
to other from the Government controlled organization and amount made less gives idea of price [26].
However, block chains used in other areas as well as IOT and other start-ups working in non-financial areas.
Ultimately, the startup rate, the rate of success in the block chain technology, that are both in the Public and
the Private applications explain that, the clients technically able to contact and their characteristic, moreover
they are having the advantages with the practical exploitation.
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