{"signature": "0xef80a1364ce54b4af84bb2edb976f2f789850a93b2a5a1565ad812b57f65463e6aec7826adfd589f99ecd6e2d7250f798dc811e4e84b44c8a8f46bcc57984ece1b", "application": {"round": "0xc1cffd1845deee83ab44cae123738a854593bcd2", "answers": [{"type": "checkbox", "answer": ["dApps & Apps", "Core Infrastructure"], "hidden": false, "question": "How does your project contribute to the advancement of the Arbitrum ecosystem?", "questionId": 0}, {"type": "paragraph", "answer": "Umbra is a stealth address protocol for the EVM. Version one of Umbra has been deployed on Arbitrum since Q1 2022. In that time, over $223 Million worth of assets have flowed through Umbra on Arbitrum, enabling privacy preserving payments for tens of thousands of unique senders.\n\nWe have also created two stealth address standards: ERC5564 & ERC6538. The contracts for these standards are deployed on Arbitrum, and we are working to drive their adoption in the ecosystem, while building Umbra v2 on top of them.\n\nThe ability to send and receive payments with some measure of privacy is a critical missing piece from many public blockchains. This is felt all the more acutely on lower fee networks like Arbitrum, where uses like e-commerce payments or donations would be feasible, but a lack of privacy acts a barrier.", "hidden": true, "question": "Describe your previous work or plans related to the Arbitrum ecosystem. How does your project strengthen Arbitrum's foundational infrastructure, improve developer efficiency, or accelerate the adoption of novel applications?", "questionId": 1}, {"type": "paragraph", "hidden": true, "question": "If applicable, describe how your project leverages Stylus or Arbitrum Orbit Chains. What unique capabilities or use cases does this enable?", "questionId": 2}, {"type": "paragraph", "answer": "ScopeLift is a 6 person team of expert, full stack EVM devs. We’ve had the pleasure of working with many great projects in the space, including work for the Arbitrum DAO. Smart contracts we've written have processed or custodied hundreds of millions of dollars.\n\nAs the creators and maintainers of Umbra, ScopeLift is uniquely qualified to push Stealth Addresses forward in the Ethereum ecosystem. Umbra is the first and only notable Stealth Address protocol in the Ethereum ecosystem to date.", "hidden": true, "question": "Describe your team's expertise in your chosen focus area within the Arbitrum ecosystem. Include relevant experience, publications, or past projects.", "questionId": 3}, {"type": "short-answer", "answer": "https://gap.karmahq.xyz/project/umbra-1", "hidden": true, "question": "Please provide a link to Karma GAP, where you are tracking and reporting on milestones.", "questionId": 4}, {"type": "paragraph", "answer": "0xFb2dc580Eed955B528407b4d36FfaFe3da685401\n0x31fe56609C65Cd0C510E7125f051D440424D38f3\n0xDbD0f5EBAdA6632Dde7d47713ea200a7C2ff91EB\n0x55649E01B5Df198D18D95b5cc5051630cfD45564\n0x6538E6bf4B0eBd30A8Ea093027Ac2422ce5d6538", "hidden": true, "question": "List any contract addresses with the associated network(s), EOAs, or deployer addresses your project has deployed.", "questionId": 5}, {"type": "paragraph", "answer": "Umbra has received approximately $900,000 in funding over the course of four years from a broad range of grants, including from Gitcoin, MolochDAO, and the Optimism RetroPGF, and the Ethereum Foundation.", "hidden": true, "question": "Have you received any previous grants or support for your work in the Arbitrum ecosystem? If so, please provide details and estimated funding amounts.", "questionId": 6}, {"type": "dropdown", "answer": "Yes", "hidden": true, "question": "Please confirm that you have read and agree to comply with the ethical standards outlined in the eligibility criteria, including Gitcoin's Quid Pro Quo policy (https://support.gitcoin.co/gitcoin-knowledge-base/gitcoin-grants/general-questions/what-is-our-quid-pro-quo-policy)", "questionId": 7}, {"type": "paragraph", "hidden": true, "question": "Do you have any potential conflicts of interest to disclose? If yes, please provide details.", "questionId": 8}, {"type": "paragraph", "hidden": true, "question": "Would you like to share anything else about your project, team, or vision for the Arbitrum ecosystem that wasn't covered in the previous questions?", "questionId": 9}], "project": {"id": "0xd046794292aa91ab772ee8c2c37f86e822d43cd8e129d4faa49ba93349a1d3fb", "title": "Umbra", "logoImg": "bafkreiem7q3g3b7knibjbskir74rdptd3rg6llsf327pcrtfaec4xoq564", "metaPtr": {"pointer": "bafkreihdfvsmqhdzlbe4hsiasw4fsvebdqhil4tbo556h2o4vwm6lkg3nu", "protocol": "undefined"}, "website": "https://app.umbra.cash", "bannerImg": "bafybeibkqio6ktgkqfvdwz3jbtcnhotwpvbxnhni4s5kouzr4jqxzl52kq", "createdAt": 1673549726599, "userGithub": "scopelift", "credentials": {"github": {"type": ["VerifiableCredential"], "proof": {"jws": "eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..VqtaEATTYNApiGZZLtrwzYFa-Vv-dWuTnhdCeMnBiPEzpDvwtRgsIYpiV_Br3xlyGo7uMcyPO0w2c_JBHYVnCg", "type": "Ed25519Signature2018", "created": "2024-04-17T20:59:29.351Z", "proofPurpose": "assertionMethod", "verificationMethod": "did:key:z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC#z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC"}, "issuer": "did:key:z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC", "@context": ["https://www.w3.org/2018/credentials/v1"], "issuanceDate": "2024-04-17T20:59:29.350Z", "expirationDate": "2024-07-16T20:59:29.350Z", "credentialSubject": {"id": "did:pkh:eip155:1:0x8f5906963Ae276E1631EFA8Ff1a9CaE6499EC5E3", "hash": "v0.0.0:jAyRQrkWla8O5iFE5WPlhEHRXSJ8VnpoPk4FoJxnrLc=", "@context": [{"hash": "https://schema.org/Text", "provider": "https://schema.org/Text"}], "provider": "ClearTextGithubOrg#ScopeLift#1479802"}}, "twitter": {"type": ["VerifiableCredential"], "proof": {"jws": "eyJhbGciOiJFZERTQSIsImNyaXQiOlsiYjY0Il0sImI2NCI6ZmFsc2V9..UYcaEN_RWSq-pXDd7wDIWtEzjvlOhhsw2pbnFLIqUs4vrTlbC88b1fkMSpSXqELof73fepAsM1jQ9RsMJmnVAQ", "type": "Ed25519Signature2018", "created": "2024-04-17T21:00:23.845Z", "proofPurpose": "assertionMethod", "verificationMethod": "did:key:z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC#z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC"}, "issuer": "did:key:z6MkghvGHLobLEdj1bgRLhS4LPGJAvbMA1tn2zcRyqmYU5LC", "@context": ["https://www.w3.org/2018/credentials/v1"], "issuanceDate": "2024-04-17T21:00:23.845Z", "expirationDate": "2024-07-16T21:00:23.845Z", "credentialSubject": {"id": "did:pkh:eip155:1:0x8f5906963Ae276E1631EFA8Ff1a9CaE6499EC5E3", "hash": "v0.0.0:e8iebnG/xkSGedA/gGGf5F1exORzhO0HZZ/4TZFEvD8=", "@context": [{"hash": "https://schema.org/Text", "provider": "https://schema.org/Text"}], "provider": "ClearTextTwitter#UmbraCash"}}}, "description": "Umbra is a protocol that lets you get paid privately on Ethereum and Layer 2 networks. \n\n## About Umbra\n\nAs a protocol, Umbra defines a simple set of standards, coupled with a singleton smart contract instance, to enable stealth addresses on Ethereum. With a stealth address, a payer can send Ether or ERC20 tokens to an address controlled by the receiver, but no one except the two parties know who that receiver is. \n\nOn chain, the transaction looks like a simple transfer to an otherwise unused address on the Ethereum network. Off chain, the sender has used a public key published by the receiver to generate the new address. By encrypting the data used to generate the address, and announcing it via the Umbra smart contract, the sender can let the receiver know they’ve sent them a payment to a new stealth address. Only the receiver can generate the private key needed to withdraw the funds.\n\nBy leveraging meta-transactions, Umbra enables withdrawers to pay relayers for gas using the tokens they’ve received. This avoids the need to fund stealth addresses with Ether before withdrawing.\n\n## Project Status\n\nThe Umbra MVP went live in June 2021. You can visit https://app.umbra.cash to send and receive stealth payments using Umbra.\n\nSince our launch, we've made many iterative improvements based on user feedback. These included better mobile responsiveness, a simpler key registry system, faster scanning when searching for received funds, and other UX enhancements. We've also launched Umbra on Polygon, Optimism, and Umbra, and made huge improvements to our relay system to make token withdrawals faster and cheaper.\n\nSince launch, Umbra has processed over 270,000 payments across all networks,  transacting assets valued nearly $500 Million dollars in the process. Over 76,000 accounts have registered stealth keys to enable privacy preserving payments through Umbra. Despite this growth, Umbra remains a grant funded public good project made possible by the community.\n\nIn 2024, we led a community effort to develop a [Stealth Address EIP](https://eips.ethereum.org/EIPS/eip-5564), so that Umbra can remain an open, public goods protocol. Both EIPs are now finalized, and we are working to drive adoption of this standard across the ecosystem.\n\n## What's Next\n\nWe are grateful to our many supporters who have enabled us to get this far. There's still lot's more work to do!\n\nWe believe there is so much more we can do to make Umbra an even more powerful privacy tool in the Ethereum ecosystem. In the year ahead, we're focused on continuing to improve Umbra through new network deployments, performance improvements, and host of small UX improvements and features.\n\nWith the stealth address standardization effort completed, we've begun work on Umbra v2. It will be the flagship implementation built on top of this new standard, and it will include a host of new features and capabilities making it significantly more flexible and powerful than Umbra v1. We're excited to share details about our v2 architecture soon!\n\n**Umbra has never raised VC funding or launched a token.** We rely on grant funding to make this project possible. Thank you for your support of privacy technology in the Ethereum ecosystem.", "lastUpdated": 0, "projectGithub": "ScopeLift", "projectTwitter": "umbracash"}, "recipient": "0x57EA12A3A8E441f5FE7B1F3Af1121097b7d3B6A8"}}