1. The document describes the process of making a digital content listing on OpenBazaar using Ricardian contracts. This involves the vendor creating a listing with metadata, their ID, the digital content details, shipping details if relevant, and specifying a moderator. 2. The buyer then places an order, funding a multisig escrow address. 3. The vendor ships the item and sends a signed transaction to release the funds. 4. The buyer confirms receipt, signs to release the funds, and can leave a rating.
Cryptocurrencies for Everyone (Dmytro Pershyn Technology Stream)IT Arena
Lviv IT Arena is a conference specially designed for programmers, designers, developers, top managers, inverstors, entrepreneur and startuppers. Annually it takes place on 2-4 of October in Lviv at the Arena Lviv stadium. In 2015 conference gathered more than 1400 participants and over 100 speakers from companies like Facebook. FitBit, Mail.ru, HP, Epson and IBM. More details about conference at itarene.lviv.ua.
Cryptocurrencies for Everyone (Dmytro Pershyn Technology Stream)IT Arena
Lviv IT Arena is a conference specially designed for programmers, designers, developers, top managers, inverstors, entrepreneur and startuppers. Annually it takes place on 2-4 of October in Lviv at the Arena Lviv stadium. In 2015 conference gathered more than 1400 participants and over 100 speakers from companies like Facebook. FitBit, Mail.ru, HP, Epson and IBM. More details about conference at itarene.lviv.ua.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Hyperledger Fabric is a blockchain framework implementation initially developed by Digital Asset and IBM and now hosted by Linux Foundation under the hyperledger project. Fabric joined the hyperledger project for incubation in the early 2016 and after 1 year of incubation, it became the first project get into the ‘active’ state. On July 11, 2017, the hyperledger Technical Steering Committee announced their first production-ready distributed ledger codebase, Hyperledger Fabric V1.0
Introduction to Bit Coin Model describing the key underlying technological features, operational details, uses and applications. Implications for Mobile Operators.
Blockchain concept and technology. How this is becoming the next trend after the Bitcoin, expanding to a myriad of solutions. Smart contracts might be using a public distributed, and encrypted platform to support data persistence.
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IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Hyperledger Fabric is a blockchain framework implementation initially developed by Digital Asset and IBM and now hosted by Linux Foundation under the hyperledger project. Fabric joined the hyperledger project for incubation in the early 2016 and after 1 year of incubation, it became the first project get into the ‘active’ state. On July 11, 2017, the hyperledger Technical Steering Committee announced their first production-ready distributed ledger codebase, Hyperledger Fabric V1.0
Introduction to Bit Coin Model describing the key underlying technological features, operational details, uses and applications. Implications for Mobile Operators.
Blockchain concept and technology. How this is becoming the next trend after the Bitcoin, expanding to a myriad of solutions. Smart contracts might be using a public distributed, and encrypted platform to support data persistence.
Shows how to be an oauth consumer and provider from PHP - OAuth 1 - including handling of tokens, secrets, and handling the workflow for devices. Also covers the workflow for OAuth 2
An Efficient Buyer - Seller Protocol to Identify the PerpetratorIDES Editor
Digital watermarks are used to prevent the possession
and transmission of copyright intellectual property over the
internet. Digital watermarking system is playing an
irrevocable role in privacy-preserving, buyer-seller
communication and e-commerce of digital content. In the past,
many buyer-seller protocols have been proposed to address
the copyright issues. Most of these protocols are only
protecting digital copyright of the digital content. This paper
proposes a new efficient buyer seller watermarking protocol
for secure digital transaction and to identify the Perpetrator
who actually pirates the digital content. To implement this
system we use a multi layerTerminate and Stay Resident
(TSR) scripting programs before embedding the
watermarking.
a digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank.
"decentralized cryptocurrencies such as bitcoin now provide an outlet for personal wealth that is beyond restriction and confiscation"
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Software Engineering, Software Consulting, Tech Lead, Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Transaction, Spring MVC, OpenShift Cloud Platform, Kafka, REST, SOAP, LLD & HLD.
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Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
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In this presentation we will share our experiences around getting started with the Globus Compute multi-user endpoint. Working with the Pharmacology group at the University of Auckland, we have previously written an application using Globus Compute that can offload computationally expensive steps in the researcher's workflows, which they wish to manage from their familiar Windows environments, onto the NeSI (New Zealand eScience Infrastructure) cluster. Some of the challenges we have encountered were that each researcher had to set up and manage their own single-user globus compute endpoint and that the workloads had varying resource requirements (CPUs, memory and wall time) between different runs. We hope that the multi-user endpoint will help to address these challenges and share an update on our progress here.
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
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AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI AppGoogle
AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI App
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(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
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Top Features to Include in Your Winzo Clone App for Business Growth (4).pptxrickgrimesss22
Discover the essential features to incorporate in your Winzo clone app to boost business growth, enhance user engagement, and drive revenue. Learn how to create a compelling gaming experience that stands out in the competitive market.
Innovating Inference - Remote Triggering of Large Language Models on HPC Clus...Globus
Large Language Models (LLMs) are currently the center of attention in the tech world, particularly for their potential to advance research. In this presentation, we'll explore a straightforward and effective method for quickly initiating inference runs on supercomputers using the vLLM tool with Globus Compute, specifically on the Polaris system at ALCF. We'll begin by briefly discussing the popularity and applications of LLMs in various fields. Following this, we will introduce the vLLM tool, and explain how it integrates with Globus Compute to efficiently manage LLM operations on Polaris. Attendees will learn the practical aspects of setting up and remotely triggering LLMs from local machines, focusing on ease of use and efficiency. This talk is ideal for researchers and practitioners looking to leverage the power of LLMs in their work, offering a clear guide to harnessing supercomputing resources for quick and effective LLM inference.
AI Genie Review: World’s First Open AI WordPress Website CreatorGoogle
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(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
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Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
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By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Need for Speed: Removing speed bumps from your Symfony projects ⚡️Łukasz Chruściel
No one wants their application to drag like a car stuck in the slow lane! Yet it’s all too common to encounter bumpy, pothole-filled solutions that slow the speed of any application. Symfony apps are not an exception.
In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
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AI Pilot Review: Key Features
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(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
Utilocate offers a comprehensive solution for locate ticket management by automating and streamlining the entire process. By integrating with Geospatial Information Systems (GIS), it provides accurate mapping and visualization of utility locations, enhancing decision-making and reducing the risk of errors. The system's advanced data analytics tools help identify trends, predict potential issues, and optimize resource allocation, making the locate ticket management process smarter and more efficient. Additionally, automated ticket management ensures consistency and reduces human error, while real-time notifications keep all relevant personnel informed and ready to respond promptly.
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Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
4. 4
Step 1: Vendor makes a listing
Metadata
1. OBCV
• OpenBazaar contract version
• Contract schemas may evolve over time and it may be
necessary to track what version of the contract is being
used
2. Expiry
• The date until the contract is a valid listing
3. Category
• Category of Ricardian Contract
• Current categories: physical goods, digital goods, services
• More categories will appear with time
4. Sub-category
• At the moment, sub-category refers to the type of
payment model
• Future sub-categories: auction, barter etc
5. 5
Step 1: Vendor makes a listing
ID (Vendor details)
1. GUID
• OpenBazaar network ID
2. Pubkeys
• Bitcoin: multisig signing key
• PGP: transportable identity if the vendor has >1 node
3. Passcard
• Onename’s Passcard username
• Used to establish broader ID of the Vendor
6. 6
Step 1: Vendor makes a listing
Digital Content
1. Title
• Name of the item
2. Description
• Character limited description of the item
3. Price
• Bitcoin: shipping fee in bitcoin
• Fiat: shipping fee in fiat that the bitcoin price floats to
4. Images
• Image hash: SHA256 hash of the image to lock in identity of the
image
• Image URLs: if not locally hosted by the Vendor’s node
5. Keywords
• Used for reverse-lookup on the distributed hash table (i.e.
search)
6. Process Time
• The maximum predicted time it will take a Vendor to ship the
item after receiving an order
7. Ephemeral
• Defines how long the content is available for (time, downloads)
if applicable
7. 7
Step 1: Vendor makes a listing
Moderator
1. GUID
• OpenBazaar network ID
2. Pubkeys
• PGP: transportable identity if the Moderator has
>1 node
• Escrow Pubkey: public key combined with the
buyer’s 32 byte chain code to generate
Moderator’s multisignature signing key
3. Passcard
• Onename’s Passcard username
• Used to establish broader ID of the Vendor
4. Service
• Service fee: percentage or flat fee per transaction
• Service description: activities and terms of service
8. 8
Vendor cryptographic keys shown in
‘01_listing’ are used to digitally sign all of
the ‘01_listing’ data, which proves that the
owner of the keys created this data
Step 1: Vendor makes a listing
{"01_metadata":{"01_obcv":"","02_expiry":"","03_category":"physical good","04_category_sub":"fixed
price"},"02_id":{"01_guid":"","02_pubkeys":{"bitcoin":"","pgp":""},"03_passcard":""},"03_item":{"01_tit
le":"","02_description":"","03_condition":"","04_price":{"bitcoin":"","fiat":{"01_price":"","02_currency
_code":""}},"05_images":{"image_hashes":[""],"image_urls":[""]},"06_keywords":[""],"07_process_time
":""},"04_shipping":{"01_free":false,"02_flat_fee":{"01_bitcoin":{"01_domestic":"","02_international":"
"},"02_fiat":{"01_price":{"01_domestic":"","02_international":""},"02_currency_code":""}},"03_est_deli
very":{"01_domestic":"","02_international":""},"04_api":{"01_api_src":"Shippo","02_carriers":["FedEx",
"UPS"],"03_package":{"01_length":"","02_width":"","03_height":"","04_distance_unit":"","05_weight":
"","06_mass_unit":""},"04_shipping_origin":{"01_country":"","02_zip":""}}},"05_moderator":{"01_guid"
:"","02_pubkeys":{"pgp":"","pgp_sig":"sig(selfsig_pubkey)","pubkey":"xxx"},"03_passcard":"","04_servic
e":{"01_service_fee":"","02_service_desc":""}}}
What it looks
like in JSON
10. 10
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow)
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
11. 11
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow)
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
Reference Hash
1. Reference
• Contract ID (listing) that the order applies to
• Example:
• RIPEMD-160(01_vendor): cca4b4bf91a16ee76e1944624c4f7c0f8729a6f1
• Base58(RIPEMD-160[01_vendor]): 3rMrSZ2VDgb63ZvgEsdVjiscXurg
• Final: OB3rMrSZ2VDgb63ZvgEsdVjiscXurg
12. 12
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow)
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
ID (Buyer)
1. Pubkeys
• Unlike the Vendor, the Buyer is only identified in
the contract by their bitcoin signing key
• Bitcoin: multisig signing key
13. 13
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow), and send shipping address
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
Digital Content
1. Semantics
• Any data the buyer needs to give to the Vendor
to make a purchase
• E.g. Quality
14. 14
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow), and send shipping address
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
Multisignature Details
1. Chain code
• 32 bytes of random data used to generate the
Moderator’s multisig signing public key
2. Multisignature address
• Multisig address generated from the Vendor,
Buyer and Moderator’s bitcoin pubkeys
3. Redemption script
• To verify that the multisig address is comprised
of the pubkeys listed in the contract
4. Transaction ID (txid)
• Evidence that the Buyer has funded the
multisignature address with the purchase
amount in the listing
• Optional, in the sense that if the payment is
made from the Bitcoin purse, the TXID can be
automatically filled in
15. 15
Stage 2: Buyer places an order
2. Buyer places an order, funds multisig address (funds are now in
escrow), and send shipping address
Buyer generates a 32 byte chain code, combines with Moderator
public key to generate a pubkey for the Moderator. The Moderator
can generate the private key in the event of a dispute after the 32
byte chain code is disclosed. Multisignature escrow address can now
be generated from the Vendor, Buyer and Moderator’s pubkeys.
Signatures
• Bitcoin
• Multisig signing key of the Buyer is used to
sign JSON data from ‘02_buyer.01_order’
17. 17
Step 3: Vendor ships the item
3. Vendor indicates that the order is processed and a URL
to the digital content is sent; sends a signed transaction
releasing funds from escrow to their payout address
(signature required from Buyer or Moderator to release
funds after item delivered)Alice
The Vendor
18. 18
Step 3: Vendor ships the item
3. Vendor indicates that the order is processed and a URL
to the digital content is sent; sends a signed transaction
releasing funds from escrow to their payout address
(signature required from Buyer or Moderator to release
funds after item delivered)Alice
The Vendor
Reference Hash
1. Reference
• Contract ID (order) that the data
applies to
19. 19
Step 3: Vendor ships the item
3. Vendor indicates that the order is processed and a URL
to the digital content is sent; sends a signed transaction
releasing funds from escrow to their payout address
(signature required from Buyer or Moderator to release
funds after item delivered)Alice
The Vendor
Source
1. Content Source
• Encrypted URL: link for the Buyer to download,
stream, or access the digital content; XOR’d with
a nonce encrypted with the Buyer and
Moderator’s public key
• Encrypted Password: password to the content, if
any; XOR’d with a nonce and encrypted with the
Buyer and Moderator’s public key
• SHA256 nonce: necessary to determine the URL
and password; used to verify against
• Encrypted nonce: nonce encrypted to the Buyer’s
public key
2. Payout
• Payout address: Vendor’s bitcoin address where
the multisig funds will be released to after the
item is delivered
• Signed transaction: signed transaction releasing
funds from multisig to the payout address;
requires only 1 more signature from Buyer or
Moderator to be accepted
20. 20
Step 3: Vendor ships the item
3. Vendor indicates that the order is processed and a URL
to the digital content is sent; sends a signed transaction
releasing funds from escrow to their payout address
(signature required from Buyer or Moderator to release
funds after item delivered)Alice
The Vendor
Signatures
• Bitcoin
• Multisig signing key of the Vendor is used to sign JSON
data from ‘03_vendor.01_invoice’
• PGP
• PGP key of the Vendor is used to sign JSON data from
‘03_vendor.01_invoice’
22. 22
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
23. 23
Reference Hash
1. Reference
• Contract ID (shipping notice) that the
data applies to
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
24. 24
Digital Content
1. Received
• Was the digital content accessible
(Boolean)?
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
25. 25
Payout
1. Signed transaction
• The Buyer-signed transaction from the
Vendor (in `03_vendor`) that releases funds
from multisig to the Vendor’s payout
address
2. Transaction ID (txid)
• Reference to the bitcoin transaction
releasing funds from multisig
• Automatically done if there is a
Bitcoin Purse
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
26. 26
Rating
1. Transaction rating
• Select from choices:
• Positive
• Neutral
• Negative
2. Content quality
• Rate out of 5 stars
3. Content description
• Rate out of 5 stars
4. Customer service
• Rate out of 5 stars
5. Feedback
• Character limited text reviewing the
transaction
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
27. 27
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.
Dispute
1. Dispute
1. Does the Buyer flag a dispute? (boolean)
2. Claim
• If there is a dispute, what does the Buyer
claim as the grievance?
28. 28
Signatures
• Bitcoin
• Multisig signing key of the Vendor is used to sign
JSON data from ‘04_buyer.01_receipt’
Step 4: Buyer confirms item received
Bob
The Buyer
4. Buyer indicates that the content was accessible;
signs transaction and release funds from multisig to
the Vendor. Attaches rating/review.