The HOPR protocol serves as a fundamental layer-0 privacy infrastructure that offers a robust foundation for developers to build upon. It ensures network-level privacy and metadata protection for various types of data exchanges. By leveraging a mixnet architecture, the protocol safeguards the identities of both senders and recipients through the utilization of multiple intermediary relay hops that blend and route traffic.
To facilitate payments, HOPR employs its custom layer-2 scaling solution known as probabilistic micropayments. Within this framework, relay mix nodes receive rewards in the form of HOPR tokens for their contributions.
Additionally, HOPR incorporates a proof-of-relay mechanism to safeguard the network against dishonest behavior, while providing economic incentives for individuals to sustainably operate a global privacy network at scale, all the while maintaining uncompromised privacy for all participants.
In contrast to other mixnets like TOR, the HOPR network introduces a unique feature where users are incentivized for their participation in data relay. Previously, it was widely believed that maintaining both incentives and complete privacy simultaneously was challenging. Privacy necessitates anonymity, but anonymity also opens the door to potential exploitation and fraudulent activities within the system.
However, HOPR tackles this issue through its payment layer, which implements a mechanism called proof of relay. This innovative approach enables the network to reward users while safeguarding the privacy of participants.
HOPR’s significant innovation, known as proof of relay, sets it apart from previous mixnets. In the past, the lack of a mechanism to verify data forwarding hindered the possibility of incentivization and, consequently, the scalability of such networks.
With the introduction of proof of relay, node runners are now rewarded only when they can indisputably demonstrate the completion of their relay tasks. The crucial aspect is that this achievement is accomplished without compromising the privacy of either the mixnet as a whole or the individual node runners involved.
The HOPR protocol
The HOPR protocol introduces incentives for node runners who relay data packets by using its native currency, the HOPR token. Each message transmitted through the network contains HOPR tokens in the form of tickets to compensate nodes along the route. HOPR’s proof-of-relay mechanism ensures that a node can only claim a ticket once the data packet has been successfully relayed to the next downstream node. This system creates positive incentives for nodes to act responsibly within the network. Tickets are redeemed through an Ethereum-compatible blockchain (EVM), but their validity is probabilistic, preventing the analysis of a node’s behavior through timing attacks.
To maintain privacy regardless of network usage, the HOPR network continuously receives cover traffic, which consists of arbitrary data that provides camouflage for real users. This is particularly crucial during the early stages of the network when usage might be relatively low.
To cover traffic and maintain long-term network equilibrium, the HOPR Association has allocated 250 million HOPR tokens, which will be gradually released over a four-year period. These tokens will be issued anonymously by nodes sponsored by the HOPR Association and routed based on various parameters such as staked HOPR tokens, the number of open channels, and general connectivity.
Verifying off-chain activity without compromising privacy
Verifying off-chain activity without compromising privacy is a significant challenge for privacy networks. However, HOPR tackles this issue by combining incentivized cover traffic with proof-of-relay. This unique approach differentiates HOPR from other privacy networks that either lack sufficient incentives for scalability or compromise on privacy and decentralization.
To address the need for monitoring and verifying node activity, the HOPR team utilizes Ceramic, a decentralized framework. Ceramic enables the propagation of user-specific data and allows node runners to inspect and share their node’s information securely.
By leveraging Ceramic Streams, a DAG-based data structure for continuous, mutable content storage on IPFS, nodes can create log entries associated with specific messages, such as those tagged as cover traffic. As this information is linked to the secp256k1 private key used by HOPR nodes, it can be connected to a specific node and verified, preventing external manipulation of data.
Through the HOPR dashboard, node runners can access their node data and obtain meaningful information about the cover traffic received by their nodes by checking the Ceramic Streams pinned by their nodes. This utilization of Ceramic empowers both HOPR developers and users to verify the network’s state while preserving privacy.
Ceramic has revolutionized the process of issuing and verifying cover traffic in HOPR testnets, eliminating the need for cumbersome and limited utility bots. This integration of Ceramic into the HOPR Network represents the first application of logging decentralized data for an open-source protocol. The HOPR team believes that this approach can be adopted by any project relying on peer-to-peer off-chain data that would otherwise be unverifiable.
Layer 0: Laying the Foundation for Privacy
The HOPR Network distinguishes itself by operating as a Layer 0 protocol, which means privacy is at the core of its architecture. Unlike traditional blockchain networks that focus on higher layers, the HOPR Network ensures that privacy is embedded right from the foundation.
Mixnet Architecture: Protecting Identities
At the heart of the HOPR Network’s operation lies its innovative mixnet architecture. Acting as relay points, nodes within the network transfer data between users. This architecture ensures that the identities of both senders and recipients are protected. By routing data through multiple intermediate relay hops that mix traffic, the HOPR Network maintains the confidentiality and security of sensitive information.
Incentivization: Driving Node Reliability
The HOPR Network incentivizes node runners who play a vital role in relaying data packets. To encourage active participation and ensure a reliable network, the network introduces incentivization through its native currency, the HOPR token.
Data packets contain embedded HOPR tokens, known as “tickets,” which serve as rewards for nodes along the data transmission route. However, nodes can only claim these tokens once they have successfully completed their relay tasks, promoting responsible behavior within the network.
Proof of Relay: Ensuring Integrity
To maintain the integrity of the network, the HOPR Network utilizes a robust proof-of-relay mechanism. This mechanism verifies that nodes have indeed relayed data packets as intended before allowing them to claim their rewards. By enforcing proof of relay, HOPR establishes a trust layer within the network, ensuring that participants act honestly and contribute to the overall security and reliability of the network.
Cover Traffic: Safeguarding Privacy
Ensuring privacy is of paramount importance for the HOPR Network. To achieve this, the network is constantly fed with cover traffic – random data that provides anonymity for real users. This cover traffic acts as a camouflage, protecting user identities and maintaining privacy even during periods of lower network usage.
What Issues Can Layer 0 Address?
Interoperability: Interoperability refers to the ability of blockchain networks to communicate and interact with each other seamlessly. Layer 0 protocols enable different blockchain networks built on the same infrastructure to interoperate without the need for dedicated bridges. This promotes a more interconnected ecosystem of blockchain-enabled products and services, enhancing user experience and enabling features and use cases from different blockchains to be leveraged. This can lead to improved transaction speeds and greater overall efficiency.
Scalability: Monolithic blockchains like Ethereum often face scalability challenges due to the concentration of critical functions within a single Layer 1 protocol. Layer 0 can alleviate this bottleneck by delegating critical functions to different blockchains. By distributing tasks across multiple blockchains within the Layer 0 infrastructure, scalability can be enhanced. For instance, specialized chains can be optimized to handle high transaction volumes, improving the overall throughput of the system.
Developer Flexibility: Layer 0 protocols typically offer user-friendly software development kits (SDKs) and intuitive interfaces to empower developers to create their own purpose-specific blockchains. This flexibility allows developers to customize their blockchains according to their specific requirements. They can define their own token issuance models and have control over the type of decentralized applications (DApps) built on their blockchains, fostering innovation and customization in blockchain development.
How Does a Layer 0 Protocol Operate?
Different Layer 0 protocols operate with varying designs, features, and focuses. However, they generally serve as the primary blockchain that backs up transaction data from multiple Layer 1 chains. Additionally, cross-chain transfer protocols enable the seamless transfer of tokens and data across different blockchains.
Examples of Layer 0 Protocols
Polkadot: Designed by Ethereum co-founder Gavin Wood, Polkadot employs a main chain called the Polkadot Relay Chain, with independent blockchains known as parachains. The Relay Chain acts as a bridge facilitating efficient communication between parachains. Sharding is utilized to enhance transaction processing efficiency. Polkadot utilizes proof-of-stake (PoS) validation and conducts auctions for parachain slots, allowing projects to bid and secure a place in the ecosystem.
Avalanche: Launched by Ava Labs, Avalanche consists of three core chains: the Contract Chain (C-chain), Exchange Chain (X-chain), and Platform Chain (P-chain). Each chain serves specific functions within the ecosystem, ensuring security, low latency, and high throughput. Avalanche’s flexible structure enables fast and inexpensive cross-chain swaps.
Cosmos: Founded by Ethan Buchman and Jae Kwon, Cosmos consists of a PoS blockchain mainnet called Cosmos Hub and customizable blockchains known as Zones. The Cosmos Hub facilitates asset and data transfers between Zones while providing a shared layer of security. Each Zone is highly customizable, enabling developers to design their own cryptocurrency with custom block validation settings. Inter-Blockchain Communication (IBC) protocol facilitates the exchange of assets and data across independent blockchains within the Cosmos network.
HOPR’s Role in the Web3 Future
In the rapidly evolving landscape of decentralization, a new way of working and decision-making has emerged. With traditional hierarchies and power structures giving way to decentralized networks, there arises a need for mechanisms that enable planning and decision-making.
Governance addresses the mechanics of decision-making, but it is equally important to establish clear shared values that guide participants and attract collaborators. HOPR, as a Layer 0 protocol, aligns closely with the values of the Web3 movement, both in its technological design and its broader vision. Specifically, HOPR is committed to building technology and an ecosystem that is trustworthy, open to everyone, and privacy-preserving.
The Promise of Web3
Web3 represents a response to the limitations of the current state of the Internet, commonly referred to as Web 2.0. In the Web3 paradigm, users retain full control of their data whenever possible, and large platforms are replaced by an ecosystem of smaller, interoperable services facilitated by open infrastructure and standards. Web3 relies on distributed peer-to-peer technologies like blockchain and, crucially, HOPR.
In a Web3 future, if you are dissatisfied with a social media platform, you will have the ability to migrate your profile and data to an alternative platform without sacrificing control. Choosing an app or service will not come with constraints, as you will have the freedom to select from a wide range of options.
Most importantly, you will never be compelled to use a service against your will; the days of being coerced into adhering to a platform’s rules or starting from scratch elsewhere will be behind us. Moreover, if you aspire to develop an app or service, there will be a plethora of technologies at your disposal, allowing you to seamlessly integrate without being locked in or relinquishing control over your users’ data.
To realize this vision of a free and open Web3, secure and reliable data transmission between interoperable services is crucial. Surprisingly, we currently lack robust solutions for this, especially when privacy is factored in. In fact, decentralization introduces an additional layer of privacy concerns, as data is passed between numerous services provided by anonymous peers with whom you have no prior or ongoing contractual relationship. Furthermore, with each step, valuable metadata is generated, potentially revealing sensitive information. Therefore, it is imperative to establish secure and private data exchange, and that is precisely what HOPR provides.
Conclusion
The HOPR Network operates as a groundbreaking Layer 0 protocol, providing a strong foundation for privacy and security in decentralized networks. With its mixnet architecture, incentivization mechanisms, proof-of-relay, and cover traffic, HOPR ensures secure, private, and reliable data exchanges for its users. By operating as a Layer 0 protocol, HOPR embeds privacy at the core of its design, paving the way for a future where individuals have greater control over their data and where privacy is a fundamental aspect of the digital landscape.
