12 September 2024
Ethereum Open Neighborhood Tasks L2 Requirements Working Group
Vitalik Buterin recognized three essential transitions for Ethereum: scaling by L2 rollups to cut back prices, enhancing pockets safety by way of sensible contract wallets for higher safety and person expertise, and advancing privateness by privacy-preserving mechanisms. This text explores how integrating W3C Decentralized Identifiers (DIDs) and Verifiable Credentials (VCs) can handle a few of these challenges by enhancing the administration of identities, keys, and addresses, leveraging current decentralized id options to assist Ethereum’s transitions effectively to maneuver to a extra L2-based world.
As Vitalik Buterin identified in a collection of 2023 articles, significantly his Three Transitions article, Ethereum is transitioning from a younger experimental know-how right into a mature tech stack that would convey an open, international, and permissionless expertise to common customers. Nonetheless, he believes that there are three main technical transitions that the stack must bear, roughly concurrently:
L2 Scaling Transition: This includes transferring the ecosystem to rollups to handle the excessive transaction prices on Ethereum, which have reached $3.75 and even $82.48 throughout a bull run
Pockets Safety Transition: The shift to sensible contract wallets (account abstraction) is critical for enhanced person consolation and safety in storing funds and non-financial belongings, transferring away from centralized exchanges and single non-custodial wallets.
Privateness Transition: Guaranteeing privacy-preserving funds transfers and creating different privacy-preserving mechanisms comparable to social restoration and id techniques is crucial to forestall customers from resorting to centralized options that provide just some or just about no privateness.
Vitalik emphasizes that these transitions are essential and difficult because of the intense coordination required to implement them. Particularly, he mentioned the implications of those transitions on the connection between customers and addresses, cost techniques, and key administration processes. The connection between customers and their addresses, and key rotation/restoration are a significant concern each technically and from a usability perspective – UX determines success or failure irrespective of how good the underlying know-how is.
On this article, we’ll delve into these latter points and focus on how options from one other ecosystem, specifically the one centered on decentralized id, additionally also known as self-sovereign id, can considerably assist with the transitions with out having to reinvent too many wheels.
The issue assertion within the context of Ethereum’s technical transitions will be summarized as follows in response to Vitalik:
Advanced Funds: The transitions make easy actions like paying somebody extra advanced, requiring extra info than simply an handle as a result of the person wants to find out which funds to make use of, the place to ship it to, and particular cost directions usually involving id info.
Sensible Contract Wallets: Sensible Contract wallets add technical points that must be addressed, comparable to guaranteeing wallets observe ETH despatched by sensible contract code together with monitoring throughout networks.
Privateness Challenges: Privateness-preserving transactions, if applied, introduce new challenges, comparable to needing a “spending public key” and encrypted info for the recipient to seek out the cost and find out how to choose it up.
Id Modifications: The idea of an “handle” will change, probably requiring a mixture of a number of addresses, encryption keys, and different information to work together with a person.
These factors, due to this fact, increase the query of how we handle id, addresses, and their keys collectively, and in a manner that doesn’t confuse the person, and compromise the safety of their belongings.
Given the above downside assertion, the idea of an “handle” within the Ethereum ecosystem, is evolving, with the standard concept of an handle as a single cryptographic identifier changing into out of date. As an alternative, “directions for find out how to work together with me” will contain a mixture of addresses on a number of Layer 2 (L2) platforms, stealth meta-addresses, encryption keys, and different information. In his article, Vitalik factors out that one potential method could be utilizing the Ethereum Identify Service (ENS) data to comprise all id info. Sending somebody an ENS identify like “alice.eth” would enable them to entry all the required particulars for interplay, together with cost and privacy-preserving strategies. Nonetheless, this methodology has drawbacks, comparable to tying an excessive amount of to 1’s identify and the lack to have trustless counterfactual names, that are important for sending tokens to new customers and not using a prior blockchain interplay. As well as, the ENS system is a rent-seeking system. Due to this fact, extra broadly, it isn’t equitable and doesn’t assure continued possession of 1’s id; that’s not a tenable scenario. Another resolution includes keystore contracts that maintain all id info. These contracts will be counterfactual-friendly and aren’t tied to a selected identify, permitting for extra flexibility and privateness.
This brings us to the subject of keys controlling “addresses”. Particularly, key rotation and key restoration in a multi-address Ethereum Ecosystem. Key rotation is simply changing into an vital characteristic with sensible contract wallets and account abstraction the place the controlling handle of a wise contract pockets would possibly change as a result of a secret’s rotated or recovered which necessitates a brand new controlling handle. Regardless of key rotation or key restoration, the standard methodology could be to run onchain-procedures on every handle individually. That is impractical resulting from gasoline prices, counterfactual addresses, and privateness issues. As talked about earlier than, Vitalik proposes the utilization of keystore contracts that exist in a single location and level to verification logic at completely different addresses. This is able to enable the creation of a proof of the present spending key for transactions. This requires a restoration structure that separates verification logic and asset holdings, simplifying the restoration course of by requiring solely a cross-network proof for restoration.
On this context, Decentralized Identifiers can leverage keystore contracts to empower a modular verification logic for contract accounts that verifies zk proofs by a selected validation module and embeds a system to standardize onchain executions.
Including privateness measures, comparable to encrypted pointers and zk proofs, will increase complexity. Nonetheless, it presents potential synergies with keystore contracts for persistent addresses because the persistent handle might be “cloaked” in a zk proof.
What does this all imply for sensible contract wallets? Historically, wallets have been designed to safe belongings by defending the personal key related to on-chain belongings. If the important thing was to be modified, the outdated one might be safely disclosed with none threat. Nonetheless, in a zero-knowledge world wallets want to guard information apart from belongings. The instance of Zupass, a ZK-SNARK-based id system, illustrates that customers can maintain information regionally and solely reveal it when essential. Nonetheless, dropping the information’s encryption key means dropping entry to all encrypted information. Due to this fact, the administration of encryption keys can also be changing into more and more vital. Vitalik means that a number of gadgets or secret sharing amongst (key) “guardians” might be used to mitigate the danger of dropping encryption keys. Nonetheless, this method will not be appropriate for asset restoration because of the potential threat of collusion amongst “guardians”. Lastly, the idea of an handle as a person’s on-chain identifier should change, and, due to this fact, wallets should handle each asset restoration and encryption key restoration to keep away from overwhelming customers with advanced restoration processes aka poor UX. For instance, Signal In With Ethereum depends on the onchain handle and the person’s personal key controlling that key to generate the authentication message. Nonetheless, there is no such thing as a notion of a one-to-many relationship on this method, and no notion of a wise contract pockets as the first delegate of the person. The verifying celebration, additionally known as the relying celebration, due to this fact, can’t assess the scope of the authorization(s) required for the person when logging wherein is essential relying on the performance the verifying celebration makes obtainable to the person handle.
The Three Transitions are extra than simply technical enhancements; they signify radical shifts in how customers interact with Ethereum-based stacks, particularly within the areas of id, key administration, and addresses, thereby, evolving the Ethereum ecosystem from its present state right into a extra user-friendly and accessible platform that prioritizes scalability, safety, and value. Due to this fact, one would naturally ask the next query: Are there instruments and frameworks already obtainable that might be utilized by the group, particularly concerning id, key administration, and privateness to ease the transitions? The reply to that may be a particular sure. Particularly, the ecosystem that has developed across the idea of decentralized id and its requirements, frameworks, and quite a few reference implementations has produced tooling that’s readily usable inside the Ethereum stack.
What’s the Decentralized Id Ecosystem?
The decentralized id ecosystem is targeted on giving people management over their digital identities with out counting on centralized authorities. It leverages blockchain know-how and cryptographic ideas to make sure privateness, safety, and user-centric id administration. On the core of this ecosystem are two key ideas: Decentralized Identifiers (DIDs) and Verifiable Credentials (VCs).
Decentralized Identifiers (DIDs):
DIDs are a brand new kind of identifier that permits verifiable, self-sovereign digital identities. They’re distinctive, globally resolvable identifiers related to a topic, comparable to a person, group, or gadget. DIDs are decentralized by design, which means they don’t depend on a central registry or authority for his or her creation or administration. As an alternative, they’re created and managed by the customers or entities performing on their behalf. DIDs usually make the most of public-key cryptography to make sure safe interactions and permit the topic to show possession and management of their id and carry out particular licensed actions comparable to assertions, authentication, authorization, and encryption.
Verifiable Credentials (VCs):
Verifiable Credentials are digital credentials that comprise claims a few topic’s id, attributes, or {qualifications}, issued by trusted entities generally known as issuers. VCs are tamper-evident and cryptographically signed to make sure their integrity and authenticity. Importantly, VCs are transportable and will be introduced by the topic to verifiers, comparable to service suppliers or relying events, with out the necessity for these verifiers to contact the issuer immediately. This permits seamless and privacy-preserving id verification throughout completely different domains and contexts.
A number of key gamers and organizations are contributing to the event and adoption of decentralized id applied sciences:
Decentralized Id Basis (DIF): DIF is a consortium of organizations collaborating to develop requirements and protocols for decentralized id techniques. It promotes interoperability and innovation within the area.
World Vast Internet Consortium (W3C): W3C hosts the Credentials Neighborhood Group, which incubates work on verifiable credentials and associated applied sciences, and the Decentralized Identifier and Verifiable Credentials Working Teams, that are creating updates to the respective specs
Hyperledger Indy: Hyperledger Indy is an open-source venture underneath the Linux Basis. It’s centered on offering instruments and libraries for constructing decentralized id techniques.
Sovrin Basis: Sovrin Basis operates the Sovrin Community, a public permissioned blockchain designed for decentralized id administration.
Microsoft, IBM, and different tech corporations: A number of main tech corporations are actively concerned in creating decentralized id options, contributing to requirements improvement, and constructing reference implementations.
Requirements play an important position in guaranteeing interoperability and compatibility inside the decentralized id ecosystem. Some key requirements and reference implementations embrace:
Decentralized Identifier (DID) Specification: Defines the syntax and semantics of DIDs, together with strategies for his or her creation, decision, and administration.
Verifiable Credentials Knowledge Mannequin: Specifies the construction and format of verifiable credentials, together with JSON-LD contexts for representing claims.
DIDComm Messaging Protocol: Allows safe, personal communication between DIDs utilizing end-to-end encryption and cryptographic authentication.
SSI (Self-Sovereign Id) Protocols: Numerous protocols and frameworks, comparable to DID Auth, Presentation Change, and VC API, facilitate safe interactions and transactions inside the self-sovereign id paradigm.
Hyperledger Aries: A framework that gives a set of interoperable parts for constructing decentralized id options, together with brokers, wallets, and protocols.
Privado ID former Polygon ID: A set of instruments constructed for builders to create safe and trusted relationships between customers and purposes within the Web3. It focuses on decentralized id, giving customers management over their information. The toolkit relies on the open-sourced iden3 protocol.
QuarkID: An open-source DID resolution presently deployed on ZKsync Period with digital credentials being issued by the Metropolis of Buenos Aires.
Under, we element how a decentralized id framework will be efficiently utilized to the cross-network challenges for id, handle, and key administration beforehand mentioned.
Utilizing Decentralized Identifiers (DIDs)
Drawback: Managing id for a person throughout varied Ethereum networks is advanced.
DID Resolution for Identities:
DIDs present globally distinctive identifiers which are resolvable (to their DID Doc) and cryptographically verifiable throughout any blockchain community.
Every DID is related to a DID Doc which comprises details about the connection of a DID with a set of cryptographic keys, the features these keys can carry out comparable to verification, authentication, authorization, assertion, and encryption, in addition to service endpoints comparable to API endpoints to addresses managed by the keys listed within the DID Doc.
The connection of DID to their DID Paperwork or respective cryptographic representations will be saved on any blockchain community, guaranteeing tamper-proof and protracted id data.
DID Paperwork for Tackle Administration:
Drawback: Customers have completely different addresses on the Ethereum mainnet, testnets, and Layer 2 options, together with counterfactual addresses.
DID Doc resolution:
A DID doc has a verificationMethod information property permitting a DID proprietor or controller to specify symmetric and uneven cryptographic keys for any desired curve comparable to secp256k1 utilized by Ethereum stacks.
The verificationMethod for a key additionally permits the person to specify an ID for the verification methodology. That is usually the DID plus a fraction as per the DID specification. This fragment permits two essential issues. First, it means that you can specify a community identifier, for instance, “1” if the bottom line is an Ethereum key, and different numbers if that key will not be on an Ethereum community. As well as, the fragment will be prolonged to point if the important thing belongs to a counterfactual handle or a wise contract pockets. For instance, “did:ion:1234xxxxddd4444-#1-counter” would point out that the general public key recognized belongs to a counterfactual Ethereum handle. As well as, if required for sure causes to individually establish an handle on Polygon PoS vs Arbitrum One the “1” might be changed by the chainId of the goal community, e.g. 137 for Polygon PoS.
Lastly, a wise contract pockets will be given its personal DID and managed by the DIDs of the sensible contract pockets house owners the place every proprietor identifies a number of controlling keys for the pockets as specified of their DID doc. This final level permits for 2 main enhancements for sensible contract wallets – key rotation aka key restoration, and an arbitrary variety of controlling keys with out revealing these controlling keys
DID Paperwork for Key Administration together with Social Restoration:
DID Resolution for Identities:
Drawback: Key restoration and key rotation for Ethereum addresses, significantly sensible contract wallets, are advanced and aren’t user-friendly.
DID Doc resolution:
When a public key related to a DID should be rotated for safety or restoration functions, a person can merely replace a DID Doc and exchange the outdated public key with a brand new public key within the verificationMethod utilizing one other controlling key. This generally is a key the person immediately controls, or if management has been delegated, by one other person controlling a DID listed as controller.
Due to this fact, this will also be achieved for a Sensible Contract pockets. Every controller can independently replace the important thing within the verificationMethod related to their DID. That is sufficient as a result of the person can produce a cryptographic dedication that the replace was carried out appropriately that may be submitted to and verified by the sensible contract pockets.
Privateness (Zero-Information) Side of DIDs and DID Paperwork
DID Paperwork will be represented as zero-knowledge proofs by first merkelizing their JSON-LD doc, after which verifying Merkle Proofs of relationships of DID-to-key and DID-to-functional-capability (as represented by a number of cryptographic keys).
Utilizing zk-SNARKs, specifically, allows environment friendly verification of cryptographic key claims on Ethereum networks.
For instance, the zero-knowledge circuit for a sound key rotation replace of a DID doc would do two issues: a) confirm that the updating secret’s within the DID doc and is a controlling key by verifying a Merkle proof of inclusion within the DID doc and b) confirm the digital signature of the controlling key over the basis hash of the outdated DID doc. The general public inputs to the proof could be the Merkle Root of the brand new merkelized DID Doc and the basis hash of the outdated DID doc, and the personal inputs could be the Merkle proof and the digital signature. The sensible contract would solely should confirm the proof, examine that the outdated root hash was registered, after which replace the outdated with the brand new root hash.
This has the benefit that no info is leaked about which addresses management the sensible contract pockets. Each sensible contract pockets transaction might be totally nameless if all transactions submitted to the sensible contract have a recursive zero-knowledge proof that verifies {that a}) the general public key belonging to the handle submitting the transaction is a controlling key of the DID that may be a sensible contract proprietor and b) {that a} zero-knowledge proof that the transaction was signed by the right quorum of signatures of the sensible contract pockets house owners was correctly verified by a verifier within the circuit itself.
Utilizing Verifiable Credentials (VCs)
Drawback: The entity performing a key operation comparable to a key rotation or a digital signature for a monetary transaction should show that it’s a authorized entity that meets all relevant compliance guidelines for a jurisdiction that has compliance oversight.
VC Resolution for Compliant Key Operations:
W3C VCs enable assertions to be made concerning the topic of the credential comparable to “Alice is a authorized enterprise in Brazil”, or, “This enterprise is a authorized entity within the US and a registered Dealer-Supplier”, or, “The authorized US entity A is a legally registered Dealer-Supplier and is legally licensed to behave on behalf of the authorized US entity B”.
Given the standardized construction and public context reference recordsdata that specify the VC customary and particular VC varieties, every VC will be readily became a zk proof given a standardized, and publicly obtainable zk circuit. Revealing solely the authorized id of the VC issuer as the basis of belief, comparable to a KYC supplier.
Such zk proofs, specifically, ZK-SNARKs will be submitted with any transaction and verified in a wise contract comparable to a wise contract pockets or a DeFi protocol.
This permits for compliant transactions on Ethereum stacks with out revealing any delicate id or different related compliance information.
Helpful Implementations for Ethereum Networks
There are dozens of various implementations of the W3C DID specification. Whereas many DID strategies aren’t as scalable as essential, or not simply anchored on a blockchain, a number of DID strategies match the invoice for the Ethereum ecosystem – permissionless, blockchain-anchored, scalable, and low cost. All of those DID strategies are primarily based on the Sidetree Protocol. The Sidetree Protocol is a “Layer 2” DID protocol that may be applied on prime of any occasion anchoring system, together with Ethereum, and is compliant with W3C tips. The Sidetree protocol doesn’t require centralized authorities, distinctive protocol tokens, reliable intermediaries, or secondary consensus mechanisms. Particularly, the Sidetree protocol defines a core set of DID PKI state change operations, structured as delta-based Battle-Free Replicated Knowledge Sorts (i.e. Create, Replace, Get well, or Deactivate), that mutate a Decentralized Identifier’s DID Doc state.
Due to this fact, by leveraging an Ethereum-based implementation of Sidetree, the Ethereum ecosystem can make sure that every person has a self-sovereign id, that’s each personal and interoperable throughout completely different L2s and purposes.
We consider that the combination of W3C DIDs and VCs into Ethereum’s infrastructure is essential for navigating the upcoming transitions. They supply the required instruments for managing identities, keys, and handle safety, and privateness, and are aligned with the decentralized nature of blockchain know-how.
Sadly, the Ethereum ecosystem and the decentralized id (DID) ecosystem haven’t intersected a lot, although each share a deal with decentralization. The Ethereum ecosystem has primarily targeting advancing and scaling its blockchain know-how, whereas the DID ecosystem has prioritized creating requirements and protocols for governing digital identities. Because of this, alternatives for collaboration between these two ecosystems have been restricted.
We see the Three Transitions as a chance to vary this and begin a better collaboration between the Decentralized Id and Ethereum ecosystems.
Acknowledgments
Particular thanks go to Eugenio Reggianini ([email protected]) for proofreading the manuscript and including vital content material.
