Not So Anonymous - Deanonymization of Blockchain Users
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All transactions are public in most cryptocurrencies, making it is possible to deanonymize bitcoin wallet holders and learn details about their identity and their transactions. This can be done through transaction graph analysis of on-chain transactions, and through realtime network analysis of IPs and node messages. We will discuss how deanonymization is performed, how to reduce the risk on popular networks like Bitcoin, and what alternatives exist for more anonymity in cryptos.
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Not So Anonymous - Deanonymization of Blockchain Users
All transactions are public in most cryptocurrencies, making it is possible to deanonymize bitcoin wallet holders and learn details about their identity and their transactions.
This can be done through transaction graph analysis of on-chain transactions, and through realtime network analysis of IPs and node messages.
We will discuss how deanonymization is performed, how to reduce the risk on popular networks like Bitcoin, and what alternatives exist for more anonymity in cryptos.
Understanding private blockchains
This document discusses private blockchains and how they differ from public blockchains. It explains that private blockchains are permissioned shared databases that use blockchain technology like cryptography and consensus algorithms to provide trust between entities that have limited trust. While they don't have the same properties as public blockchains like immutability and anonymity, private blockchains can enable use cases like financial settlement, provenance tracking, and interorganizational record keeping where a centralized database is not ideal due to lack of trust or need for disintermediation. The document addresses criticisms of private blockchains and blockchain technology in general. It also introduces the MultiChain platform for deploying private blockchains.
Crypto for the Rest of Us
The document provides an overview of cryptocurrency and blockchain technology. It defines cryptocurrency as digital money used for transactions that is decentralized and uses cryptography. Blockchains are public ledgers that record all transactions in a network. Bitcoin was the first cryptocurrency, created in 2009, with a finite supply that is obtained through mining. Ethereum allows for creation of custom tokens and decentralized applications. Initial coin offerings have raised over $18 billion, though many are scams. Resources are provided for learning more about cryptocurrencies and blockchain.
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This document discusses various aspects of microservices architecture including decomposition, data management, deployment, testing, observability, communication, security, and user interfaces. It recommends decomposing monolithic applications by business capability or subdomain, having a separate database per service, deploying single services on containers or VMs, implementing service integration contract testing and component testing in isolation, and using centralized logging, monitoring, and tracing. It also covers API gateways, service discovery, asynchronous messaging vs RPC-style communication, circuit breakers, cross-cutting concerns, and passing access tokens from gateways to services.
Bitcoin
Bitcoin is a cryptocurrency that was created in 2008 by Satoshi Nakamoto. It operates on a decentralized peer-to-peer network with no central authority. Users can send and receive bitcoins through bitcoin addresses, which function similarly to email addresses. Bitcoins can be traded on exchanges or directly with other users. Transactions are recorded on a public ledger called the blockchain, which grows as new blocks of transactions are added approximately every 10 minutes through bitcoin mining. Miners use specialized hardware to compete to solve complex cryptographic puzzles, and the first to solve a puzzle is rewarded with bitcoins.
A Gentle introduction to Blockchain with Ethereum
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Not So Anonymous - Deanonymization of Blockchain Users
All transactions are public in most cryptocurrencies, making it is possible to deanonymize bitcoin wallet holders and learn details about their identity and their transactions.
This can be done through transaction graph analysis of on-chain transactions, and through realtime network analysis of IPs and node messages.
We will discuss how deanonymization is performed, how to reduce the risk on popular networks like Bitcoin, and what alternatives exist for more anonymity in cryptos.
Understanding private blockchains
This document discusses private blockchains and how they differ from public blockchains. It explains that private blockchains are permissioned shared databases that use blockchain technology like cryptography and consensus algorithms to provide trust between entities that have limited trust. While they don't have the same properties as public blockchains like immutability and anonymity, private blockchains can enable use cases like financial settlement, provenance tracking, and interorganizational record keeping where a centralized database is not ideal due to lack of trust or need for disintermediation. The document addresses criticisms of private blockchains and blockchain technology in general. It also introduces the MultiChain platform for deploying private blockchains.
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The InfoSec implications of using a blockchain rather than a centralized database to store inter-company information.
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This document discusses various aspects of microservices architecture including decomposition, data management, deployment, testing, observability, communication, security, and user interfaces. It recommends decomposing monolithic applications by business capability or subdomain, having a separate database per service, deploying single services on containers or VMs, implementing service integration contract testing and component testing in isolation, and using centralized logging, monitoring, and tracing. It also covers API gateways, service discovery, asynchronous messaging vs RPC-style communication, circuit breakers, cross-cutting concerns, and passing access tokens from gateways to services.
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Bitcoin is a cryptocurrency that was created in 2008 by Satoshi Nakamoto. It operates on a decentralized peer-to-peer network with no central authority. Users can send and receive bitcoins through bitcoin addresses, which function similarly to email addresses. Bitcoins can be traded on exchanges or directly with other users. Transactions are recorded on a public ledger called the blockchain, which grows as new blocks of transactions are added approximately every 10 minutes through bitcoin mining. Miners use specialized hardware to compete to solve complex cryptographic puzzles, and the first to solve a puzzle is rewarded with bitcoins.
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Blockchain is a distributed ledger that maintains a permanent record of transactions in a peer-to-peer network. Each computer in the network maintains a copy of the ledger to prevent a single point of failure. Blockchain consists of blocks of validated transactions that are linked using cryptography. It allows transactions to be recorded and validated without the need for a central authority. Blockchain has applications in finance, healthcare, and other industries by automating processes and removing trust issues through transparency. However, blockchain also faces challenges from its current limitations in scalability and regulation.
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Check our website: https://www.everythingcrypto.club/
Join our private channel group: http://bit.ly/2YoWzFr
Follow us on social media :
Youtube : https://bit.ly/3bkoeiE
Instagram: https://www.instagram.com/everythingincrypto
Telegram : https://t.me/everythingincrypto
vkontakte : https://vk.com/public184024328
Twitter : https://twitter.com/everythingcryp5
Medium : https://medium.com/everythingincrypto
Linkedin: https://www.linkedin.com/company/everythingcrypto
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Check our website: https://www.everythingcrypto.club/
Join our private channel group: http://bit.ly/2YoWzFr
Follow us on social media :
Youtube : https://bit.ly/3bkoeiE
Instagram: https://www.instagram.com/everythingincrypto
Telegram : https://t.me/everythingincrypto
vkontakte : https://vk.com/public184024328
Twitter : https://twitter.com/everythingcryp5
Medium : https://medium.com/everythingincrypto
Linkedin: https://www.linkedin.com/company/everythingcrypto
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This document provides an introduction to blockchain credit and distributed ledger technology. It discusses the problems with traditional systems that rely on centralized authorities, and how blockchain solves this through decentralization and immutability. Blockchain achieves this by bundling digital messages into cryptographically-secured blocks that are linked together in a timestamped chain. This allows for the chronicling of transactions in a way that anyone can verify but cannot be altered. The document then discusses applications of blockchain like cryptocurrencies, smart contracts, and blockchain platforms like Hyperledger and R3. It also covers criticisms of blockchain and fundamentals of cryptographic hash functions used in blockchain.
How Blockchain and Cryptocurrency works.
A blockchain is a way of storing data so that cannot be changed anymore. This is called immutability and a very useful feature when dealing with very important data like bank records or transactions.
This presentation will teach you the simplest methodology of how blockchain works.
What is blockchain public
Blockchain is a distributed ledger technology that allows for real-time, transparent transactions between counterparties without intermediaries. It replaces traditional clearinghouse and reconciliation models by giving all counterparties a shared real-time ledger where transactions are applied simultaneously. This reduces costs and risks compared to current systems. Blockchain ledgers are robust due to cryptography and distribute networks, and make tampering difficult. A variety of public and private blockchain applications are emerging for areas like finance, legal contracts, trade, and digital assets. However, challenges remain around system risks, regulation, and realizing cost savings.
What is Blockchain - TIEKE
10 Factors of blockchain
Basics of blockchain
Core components of Blockchain
Use cases of Blockchain
Distributed ledger, Peer-to-Peer network
Consensus protocol
IOT & Blockchain,
Blockchain revolution
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Not So Anonymous - Deanonymization of Blockchain Users
- 1. Not so Anonymous - Deanonymization of Blockchain Users Johannes Ahlmann Cork Blockchain Meetup 2018-11-13 https://www.dailydot.com/news/anonymous-opfullerton-kelly-thomas/
- 2. Lightning Talk - Agenda • Is Bitcoin anonymous? • What is Deanonymization? • Why should I care? • What can I do about it? • Where to get cryptos? • Alternatives
- 3. Anonymity & Privacy Anonymity "They" can see what you do, but not who you are Privacy Controlling who sees what activities you engage in https://d262ilb51hltx0.cloudfront.net/max/1610/1*d0KdwdeKDi5m8n-sZdr-_A.png
- 4. Anonymity 1/2 • Pseudonymity - People are aware of one or multiple pseudonyms of yours, but not your true identity • Anonymity = Pseudonymity + Unlinkability • Unlinkability • Different actions of the same user should not be linkable to each other • Linking of addresses to users • Linking of transactions to users • Linking of senders to recipients source: Prof. Murtuza Jadliwala
- 5. Anonymity 2/2 • Privacy vs. Decentralization • Public Ledger is core component in consensus and sharing state of the world • Bitcoin is pseudonymous, not anonymous • public addresses = pseudonyms • much less anonymous, private than cash • Many Bitcoins are acquired through Exchanges or Mining Pools • Relatively few merchants/ market participants to trade with
- 6. What is Deanonymization • Linking you to your addresses • Linking you to your transactions • Tagging, clustering of totality of addresses, transactions • Approaches • Transaction Graph Analysis • Realtime Network Analysis of P2P network
- 7. Transaction Graph Analysis 1/2 Change Address Combined Addresses
- 8. Transaction Graph Analysis 2/2 • Bitcoin transactions are public • Active collecting • Mining pools • Online wallets • Exchanges • Merchants • Gambling • Tagging clusters • One tagged address in cluster tags all cluster • Bitcoin address should only be used once An Analysis of Anonymity in the Bitcoin System F. Reid and M. Harrigan, PASSAT 2011
- 9. Realtime Network Analysis • "Attack" on the P2P Network • Peers distinguished over set of its (8) entry nodes • Linking inputs • Tagging clusters
- 11. Realtime Network Analysis • Linking of different transactions to same user • Each peer is trying to connect to 8 entry nodes • Network discovery • Servers • Receive incoming connections • Max. 117 incoming connections • Clients • 8 outgoing connections • Peers are distinguished over set of it’s entry nodes!
- 12. Remediation • Hierarchical Deterministic Wallets • Random Address Pool Wallets • Tor • Mixers • Who can we trust? • Coinjoin • How to find Peers? • Anonymous cryptocurrencies
- 13. Anonymous Currencies Monero - Ring signatures Dash - Fork of bitcoin, coin-mixing service Zcash - zk-SNARK, zero knowledge proofs Verge - Tor and I2P network for privacy Komodo - Fork of Zcash, zk-SNARK Pivx - Fork of Dash, Zerocoin protocol (Legitimate goods vs. legitimate worries; how can this be used for good or bad?)
- 14. Thank You!
- 15. Resources • https://coincenter.org/entry/how-anonymous-is-bitcoin • https://bitcoinmagazine.com/articles/is-bitcoin-anonymous-a-complete-beginner-s-guide-1447875283/ • https://www.coursera.org/lecture/cryptocurrency/how-to-de-anonymize-bitcoin-qnS76 • https://www.slideshare.net/bhaslhofer/bitcoin-deanonymization-and-money-laundering-detection-strategies • https://pwlconf.org/2018/giulia-fanti/ • https://www.technologyreview.com/s/608716/bitcoin-transactions-arent-as-anonymous-as-everyone-hoped/ • https://decentralize.today/a-new-attack-vector-to-deanonymize-bitcoin-users-9c6dc433d4b6 • https://www.deepdotweb.com/2017/04/20/how-companies-are-deanonymizing-bitcoin/ • https://www.slideshare.net/bhaslhofer/bitcoin-deanonymization-and-money-laundering-detection-strategies • https://bitcoinsandblockchains.blogspot.com/2016/05/bitcoin-deanonymization.html • https://btcmanager.com/u-s-department-of-homeland-security-create-bitcoin-deanonymization-tool/ • https://www.deepdotweb.com/2018/01/02/using-bitcoin-transaction-analysis-deanonymizing-users-tor-hidden-services/