Backend Engineer
Vancouver, Canada
Full time
Office
Compensation is not specified
Role
Backend Engineer
Description
LayerZero
Overview:
LayerZero, founded in 2021, is dedicated to empowering a community of cross-chain developers to create decentralized applications (dApps) unrestricted by specific blockchain capabilities. Through a simple messaging protocol, LayerZero enables the development of cross-chain dApps that leverage the strengths of individual blockchains. The company is backed by world-renowned investors such as a16z, Sequoia, PayPal, Binance Ventures, and many others.
Position Summary:
LayerZero is looking for a skilled Backend Engineer to join their innovative team. In this role, you will be instrumental in advancing blockchain interoperability and shaping the future of decentralized applications. As a Backend Engineer, your focus will be on designing and implementing robust and scalable backend systems to support LayerZero's web3 technologies.
Responsibilities:
- Develop complex backend systems and demonstrate a strong understanding of backend system design.
- Write clean, scalable, and well-tested code to build and optimize systems.
- Thrive in a fast-paced startup environment by taking initiative and solving problems independently.
- Contribute code to sustain high transactional volumes without hesitation.
- Show enthusiasm for learning new technologies and problem-solving methodologies.
- Communicate complex technical ideas clearly and concisely.
- Demonstrate meticulous problem-solving skills and attention to detail.
Requirements:
- Bachelor's degree in Computer Science or a similar field, or equivalent practical experience.
- Strong belief in your architectural designs while being open to collaborative solutions.
- Familiarity with AWS services for deploying, managing, and scaling applications.
- Proficiency in backend development languages, notably Typescript.
- Experience working with workflow engines.
- Prior exposure to blockchain technologies, smart contracts, and decentralized finance is advantageous.
The annual salary for this position ranges from $120,000 to $200,000 and may vary based on relevant skills and experience. LayerZero offers comprehensive compensation packages that may include equity and various benefits such as medical and financial coverage.
Equal Opportunity Employer:
LayerZero Labs is devoted to creating an inclusive workplace. The company values diversity and equal opportunities, refraining from discrimination based on race, gender, sexual orientation, or any other legally protected status.
Skills Required
LayerZero
Website
layerzero.networkCompany size
Not specified
Location
United States
Description
Not specified
Adrian Cole
Project Manager — Web3 / SaaS
Remote, USA
Remote, USA
Full time
Remote
About WalletFunnel
WalletFunnel is a Web3 analytics and attribution platform built to help crypto projects understand which marketing channels, campaigns, and influencers actually generate valuable on-chain users.
We connect marketing activity with wallet actions such as wallet connections, deposits, transactions, volume, revenue, and ROI.
About the Role
We are looking for a proactive Project Manager to join WalletFunnel and help coordinate product development, marketing, operations, and communication between team members.
You will work closely with developers, designers, marketing specialists, and management to keep projects organized, deadlines clear, and execution moving forward.
Responsibilities
• Plan and manage projects from idea to launch
• Create tasks, milestones, priorities, and deadlines
• Coordinate developers, designers, marketing, and other team members
• Track progress and identify blockers before they become problems
• Organize workflows using project management tools
• Help improve internal processes and team communication
• Prepare clear project updates and reports
• Make sure deliverables meet requirements and deadlines
• Participate in product planning and feature prioritization
• Help coordinate external contractors and partners when required
Requirements
• 1–3+ years of experience in project management, operations, or a similar role
• Strong organizational and communication skills
• Experience working with remote teams
• Ability to manage multiple tasks and priorities simultaneously
• Understanding of Agile workflows and task management
• Comfortable working with developers and technical teams
• Strong written English
• Independent, proactive, and able to take ownership
Nice to Have
• Previous experience in Web3, crypto, SaaS, fintech, or analytics products
• Basic understanding of blockchain, wallets, DeFi, or crypto marketing
• Experience with startup environments
• Experience working with distributed international teams
What We Offer
• Fully remote position
• Flexible working environment
• Opportunity to work on an early-stage Web3 product
• Direct communication with the founding team
• Opportunity to influence product development and internal processes
• Competitive compensation based on experience
We are looking for someone who does more than simply track tasks. We want a Project Manager who can take ownership, communicate clearly, identify problems early, and help the team move faster.
If this sounds like you, apply with a short introduction about your experience and tell us about one project you managed from planning through delivery
WalletFunnel is a Web3 analytics and attribution platform built to help crypto projects understand which marketing channels, campaigns, and influencers actually generate valuable on-chain users.
We connect marketing activity with wallet actions such as wallet connections, deposits, transactions, volume, revenue, and ROI.
About the Role
We are looking for a proactive Project Manager to join WalletFunnel and help coordinate product development, marketing, operations, and communication between team members.
You will work closely with developers, designers, marketing specialists, and management to keep projects organized, deadlines clear, and execution moving forward.
Responsibilities
• Plan and manage projects from idea to launch
• Create tasks, milestones, priorities, and deadlines
• Coordinate developers, designers, marketing, and other team members
• Track progress and identify blockers before they become problems
• Organize workflows using project management tools
• Help improve internal processes and team communication
• Prepare clear project updates and reports
• Make sure deliverables meet requirements and deadlines
• Participate in product planning and feature prioritization
• Help coordinate external contractors and partners when required
Requirements
• 1–3+ years of experience in project management, operations, or a similar role
• Strong organizational and communication skills
• Experience working with remote teams
• Ability to manage multiple tasks and priorities simultaneously
• Understanding of Agile workflows and task management
• Comfortable working with developers and technical teams
• Strong written English
• Independent, proactive, and able to take ownership
Nice to Have
• Previous experience in Web3, crypto, SaaS, fintech, or analytics products
• Basic understanding of blockchain, wallets, DeFi, or crypto marketing
• Experience with startup environments
• Experience working with distributed international teams
What We Offer
• Fully remote position
• Flexible working environment
• Opportunity to work on an early-stage Web3 product
• Direct communication with the founding team
• Opportunity to influence product development and internal processes
• Competitive compensation based on experience
We are looking for someone who does more than simply track tasks. We want a Project Manager who can take ownership, communicate clearly, identify problems early, and help the team move faster.
If this sounds like you, apply with a short introduction about your experience and tell us about one project you managed from planning through delivery
Payment in Crypto
TAQuant
Operations Assistant
Full time
Remote
About the Role
We're looking for an Operations Assistant to work closely with our VP of Operations and help keep the company organized and running smoothly.
A big part of this role is taking things off the team's plate. You'll be working on documents, organizing files, keeping information up to date, writing and maintaining internal documentation, doing research, following up on tasks, and helping with whatever operational work needs to get done.
We're a lean team, so this is not a role where you'll be given one task and wait for the next one. There will be a lot of different things coming your way. Some will be routine, some will be completely new. We need someone who can figure things out, stay organized, and follow through without needing to be managed every step of the way.
We're also still in the process of bringing in investors, so we're keeping the team lean and being thoughtful about hiring. We're looking for someone who can be genuinely useful across different areas of the business and grow with the company.
Responsibilities
Work directly with the VP of Operations on day-to-day operational tasks
Create, organize, update, and maintain company documents and files
Keep Google Drive and other company folders clean, organized, and easy to navigate
Write and maintain SOPs, process documents, internal guides, and other documentation
Take information from meetings, chats, notes, and conversations and turn it into clear documentation
Maintain spreadsheets, trackers, reports, and other internal records
Help keep tasks, deadlines, and follow-ups organized
Research different topics and put together useful summaries and information
Help coordinate with team members and follow up on things that need to get done
Help improve the way we organize information and run internal processes
Assist with onboarding materials and other internal resources
Take on one-off projects and administrative tasks as needed
Handle confidential company information responsibly
Requirements
1+ years of experience in operations, administration, executive assistance, project coordination, or a similar role
Very organized and detail-oriented
Strong written English and comfortable writing clear documentation
Comfortable working with Google Docs, Sheets, Drive, and similar tools
Good at organizing large amounts of information and files
Able to manage multiple tasks without losing track of details
Comfortable working independently and figuring things out
Reliable and good at following through
Comfortable in a remote and fast-moving environment
Willing to do whatever needs to be done to keep things moving
Nice to Have
Experience working directly with a founder, executive, or operations team
Experience writing SOPs or internal documentation
Familiarity with Notion, Slack, ClickUp, Asana, Airtable, or similar tools
Good spreadsheet skills
Experience at a startup or small company
Comfortable using AI tools to help with research, writing, organization, and repetitive work
Experience in crypto, Web3, fintech, trading, or financial services
Who This Is For
This role is a good fit if you're naturally organized and like getting things done.
If someone sends you 20 files and says "please organize these," you should be able to figure out a sensible system and get it done.
If a process keeps coming up but nobody has documented it, you should be comfortable writing it down.
If you notice something is missing or could be done better, we want you to speak up and fix it.
We're looking for someone dependable, practical, and easy to work with. You don't need to know everything coming in. You just need to be willing to learn, take ownership, and get the work done.
We're looking for an Operations Assistant to work closely with our VP of Operations and help keep the company organized and running smoothly.
A big part of this role is taking things off the team's plate. You'll be working on documents, organizing files, keeping information up to date, writing and maintaining internal documentation, doing research, following up on tasks, and helping with whatever operational work needs to get done.
We're a lean team, so this is not a role where you'll be given one task and wait for the next one. There will be a lot of different things coming your way. Some will be routine, some will be completely new. We need someone who can figure things out, stay organized, and follow through without needing to be managed every step of the way.
We're also still in the process of bringing in investors, so we're keeping the team lean and being thoughtful about hiring. We're looking for someone who can be genuinely useful across different areas of the business and grow with the company.
Responsibilities
Work directly with the VP of Operations on day-to-day operational tasks
Create, organize, update, and maintain company documents and files
Keep Google Drive and other company folders clean, organized, and easy to navigate
Write and maintain SOPs, process documents, internal guides, and other documentation
Take information from meetings, chats, notes, and conversations and turn it into clear documentation
Maintain spreadsheets, trackers, reports, and other internal records
Help keep tasks, deadlines, and follow-ups organized
Research different topics and put together useful summaries and information
Help coordinate with team members and follow up on things that need to get done
Help improve the way we organize information and run internal processes
Assist with onboarding materials and other internal resources
Take on one-off projects and administrative tasks as needed
Handle confidential company information responsibly
Requirements
1+ years of experience in operations, administration, executive assistance, project coordination, or a similar role
Very organized and detail-oriented
Strong written English and comfortable writing clear documentation
Comfortable working with Google Docs, Sheets, Drive, and similar tools
Good at organizing large amounts of information and files
Able to manage multiple tasks without losing track of details
Comfortable working independently and figuring things out
Reliable and good at following through
Comfortable in a remote and fast-moving environment
Willing to do whatever needs to be done to keep things moving
Nice to Have
Experience working directly with a founder, executive, or operations team
Experience writing SOPs or internal documentation
Familiarity with Notion, Slack, ClickUp, Asana, Airtable, or similar tools
Good spreadsheet skills
Experience at a startup or small company
Comfortable using AI tools to help with research, writing, organization, and repetitive work
Experience in crypto, Web3, fintech, trading, or financial services
Who This Is For
This role is a good fit if you're naturally organized and like getting things done.
If someone sends you 20 files and says "please organize these," you should be able to figure out a sensible system and get it done.
If a process keeps coming up but nobody has documented it, you should be comfortable writing it down.
If you notice something is missing or could be done better, we want you to speak up and fix it.
We're looking for someone dependable, practical, and easy to work with. You don't need to know everything coming in. You just need to be willing to learn, take ownership, and get the work done.
Payment in Crypto
Common Knowledge Base Association (CKBA)
Senior Content Writer
Full time
Remote
About CKBA
CKBA (Common Knowledge Base Association) is a contributor-governed organization supporting the CKB ecosystem, bringing together researchers, developers, and contributors working on blockchain infrastructure and applications.
Learn more about us:
Website: https://ckba.build
GitHub: https://github.com/nervosnetwork/ckb
About the Role
We’re looking for a Senior Content Writer who can bridge the gap between complex blockchain technology and broader audiences.
You’ll research protocol designs, technical concepts, and ecosystem developments, then turn them into clear, thoughtful, and engaging educational content.
Responsibilities
Research and write high-quality educational long-form articles about CKB, blockchain infrastructure, and related topics.
Translate protocol updates and complex technical concepts into clear, engaging content for broader audiences.
Write high-impact content for X, including posts, threads, long-form posts, and thought-leadership quote tweets.
Collaborate closely with researchers, engineers, and ecosystem contributors to ensure technical accuracy.
Review and edit content from other contributors to maintain a consistent editorial standard and tone.
Stay current with industry trends and contribute to broader ecosystem narratives where relevant.
Apply SEO and GEO best practices where appropriate.
Effectively leverage AI tools to improve research, drafting, editing, and writing workflows while maintaining high editorial quality.
Qualifications
Required
4+ years of professional writing experience (7+ years preferred).
Deep understanding of blockchain technology and the broader crypto ecosystem.
Proven ability to explain complex technical concepts in a way that is accurate, engaging, and accessible.
Exceptional written English with strong attention to clarity, structure, and detail. Native-level proficiency is preferred but not required.
Excellent research skills and intellectual curiosity.
Experience writing educational, technical, or research-driven long-form content.
Experience creating engaging content for X (Twitter), including threads and thought-leadership content.
Familiarity with SEO/GEO principles and AI-assisted writing workflows.
Preferred
Experience working with an L1, L2, major DeFi protocol, blockchain infrastructure project, or centralized exchange.
Background in editorial, journalism, research communications, or educational content.
Experience reviewing and editing the work of other writers.
This role is probably not the right fit if your experience has been primarily focused on news reporting, market analysis, or short-form marketing copy.
Application
Please send your application to join@ckba.build with the subject line:
Senior Content Writer – Your Name
Please include:
Your resume
Three writing samples that best represent your work
We are especially interested in educational, technical, or research-driven long-form content that demonstrates your ability to explain complex blockchain concepts clearly and effectively. If you have collaborated with others on a piece, please briefly describe your contribution.
Please prioritize your strongest writing samples, as writing quality will be a key part of our evaluation process.
CKBA (Common Knowledge Base Association) is a contributor-governed organization supporting the CKB ecosystem, bringing together researchers, developers, and contributors working on blockchain infrastructure and applications.
Learn more about us:
Website: https://ckba.build
GitHub: https://github.com/nervosnetwork/ckb
About the Role
We’re looking for a Senior Content Writer who can bridge the gap between complex blockchain technology and broader audiences.
You’ll research protocol designs, technical concepts, and ecosystem developments, then turn them into clear, thoughtful, and engaging educational content.
Responsibilities
Research and write high-quality educational long-form articles about CKB, blockchain infrastructure, and related topics.
Translate protocol updates and complex technical concepts into clear, engaging content for broader audiences.
Write high-impact content for X, including posts, threads, long-form posts, and thought-leadership quote tweets.
Collaborate closely with researchers, engineers, and ecosystem contributors to ensure technical accuracy.
Review and edit content from other contributors to maintain a consistent editorial standard and tone.
Stay current with industry trends and contribute to broader ecosystem narratives where relevant.
Apply SEO and GEO best practices where appropriate.
Effectively leverage AI tools to improve research, drafting, editing, and writing workflows while maintaining high editorial quality.
Qualifications
Required
4+ years of professional writing experience (7+ years preferred).
Deep understanding of blockchain technology and the broader crypto ecosystem.
Proven ability to explain complex technical concepts in a way that is accurate, engaging, and accessible.
Exceptional written English with strong attention to clarity, structure, and detail. Native-level proficiency is preferred but not required.
Excellent research skills and intellectual curiosity.
Experience writing educational, technical, or research-driven long-form content.
Experience creating engaging content for X (Twitter), including threads and thought-leadership content.
Familiarity with SEO/GEO principles and AI-assisted writing workflows.
Preferred
Experience working with an L1, L2, major DeFi protocol, blockchain infrastructure project, or centralized exchange.
Background in editorial, journalism, research communications, or educational content.
Experience reviewing and editing the work of other writers.
This role is probably not the right fit if your experience has been primarily focused on news reporting, market analysis, or short-form marketing copy.
Application
Please send your application to join@ckba.build with the subject line:
Senior Content Writer – Your Name
Please include:
Your resume
Three writing samples that best represent your work
We are especially interested in educational, technical, or research-driven long-form content that demonstrates your ability to explain complex blockchain concepts clearly and effectively. If you have collaborated with others on a piece, please briefly describe your contribution.
Please prioritize your strongest writing samples, as writing quality will be a key part of our evaluation process.
Payment in Crypto
Utopos
Web3 Market Maker & Liquidity Manager
Panama City, Panama +3
Panama City, Panama +3
Full time
Hybrid
Web3 Market Maker & Liquidity Manager
Company: UTOPOS
Location: Remote (Worldwide)
Compensation: Negotiable (USDC, UTOP, or a combination)
About UTOPOS
UTOPOS is a blockchain ecosystem building the future of decentralized commerce, gaming, payments, sports, and smart city infrastructure. UTOP is the ecosystem's native digital currency, designed for real-world utility across multiple platforms.
We are seeking an experienced Web3 Market Maker & Liquidity Manager to help improve the trading experience and liquidity of the UTOP token while supporting the long-term growth of the ecosystem.
Responsibilities
Develop and execute market-making strategies for UTOP.
Monitor liquidity pools and trading activity across supported decentralized exchanges.
Improve bid/ask spreads and market depth.
Recommend liquidity allocation strategies.
Monitor trading volume, volatility, and order book health.
Identify opportunities to improve trading efficiency.
Prepare regular reports on market performance and liquidity metrics.
Coordinate with the UTOPOS team on exchange listings and liquidity initiatives.
Recommend best practices for sustainable token liquidity.
Requirements
Experience as a market maker, liquidity manager, or professional crypto trader.
Strong understanding of decentralized exchanges and automated market makers.
Experience with Uniswap, Polygon, and EVM-compatible ecosystems.
Knowledge of liquidity pool management and tokenomics.
Familiarity with on-chain analytics tools.
Strong analytical and quantitative skills.
Ability to work independently in a remote environment.
Preferred Qualifications
Experience supporting emerging blockchain projects.
Understanding of treasury management.
Experience with algorithmic trading or market-making tools.
Knowledge of cross-chain liquidity strategies.
Familiarity with Web3 analytics platforms.
Compensation
Compensation is negotiable and may include:
Fixed monthly compensation.
Performance-based incentives.
Payment in USDC, UTOP, or a mutually agreed combination.
How to Apply
Please include:
A brief introduction.
Your relevant market-making or liquidity management experience.
Blockchain projects you have supported.
Exchanges and protocols you have worked with.
Examples of measurable results you achieved.
Your preferred compensation structure.
Important: UTOPOS seeks to maintain fair, transparent, and orderly markets. Applicants should have experience with legitimate market-making and liquidity management practices. Any strategies involving market manipulation, wash trading, spoofing, or other deceptive trading activities will not be considered.
Company: UTOPOS
Location: Remote (Worldwide)
Compensation: Negotiable (USDC, UTOP, or a combination)
About UTOPOS
UTOPOS is a blockchain ecosystem building the future of decentralized commerce, gaming, payments, sports, and smart city infrastructure. UTOP is the ecosystem's native digital currency, designed for real-world utility across multiple platforms.
We are seeking an experienced Web3 Market Maker & Liquidity Manager to help improve the trading experience and liquidity of the UTOP token while supporting the long-term growth of the ecosystem.
Responsibilities
Develop and execute market-making strategies for UTOP.
Monitor liquidity pools and trading activity across supported decentralized exchanges.
Improve bid/ask spreads and market depth.
Recommend liquidity allocation strategies.
Monitor trading volume, volatility, and order book health.
Identify opportunities to improve trading efficiency.
Prepare regular reports on market performance and liquidity metrics.
Coordinate with the UTOPOS team on exchange listings and liquidity initiatives.
Recommend best practices for sustainable token liquidity.
Requirements
Experience as a market maker, liquidity manager, or professional crypto trader.
Strong understanding of decentralized exchanges and automated market makers.
Experience with Uniswap, Polygon, and EVM-compatible ecosystems.
Knowledge of liquidity pool management and tokenomics.
Familiarity with on-chain analytics tools.
Strong analytical and quantitative skills.
Ability to work independently in a remote environment.
Preferred Qualifications
Experience supporting emerging blockchain projects.
Understanding of treasury management.
Experience with algorithmic trading or market-making tools.
Knowledge of cross-chain liquidity strategies.
Familiarity with Web3 analytics platforms.
Compensation
Compensation is negotiable and may include:
Fixed monthly compensation.
Performance-based incentives.
Payment in USDC, UTOP, or a mutually agreed combination.
How to Apply
Please include:
A brief introduction.
Your relevant market-making or liquidity management experience.
Blockchain projects you have supported.
Exchanges and protocols you have worked with.
Examples of measurable results you achieved.
Your preferred compensation structure.
Important: UTOPOS seeks to maintain fair, transparent, and orderly markets. Applicants should have experience with legitimate market-making and liquidity management practices. Any strategies involving market manipulation, wash trading, spoofing, or other deceptive trading activities will not be considered.
Payment in Crypto
Utopos
Business Development & Marketing Representative (Commission-Based)
Panama City, Panama
Panama City, Panama
Full time
Hybrid
Business Development & Marketing Representative (Commission-Based)
Company: UTOPOS
Location: Remote (Worldwide)
Compensation: Commission-Based (Paid in UTOP)
About UTOPOS
UTOPOS is building a decentralized ecosystem that connects blockchain technology with commerce, gaming, sports, payments, and future smart city development. UTOP is the ecosystem's native digital currency, designed for use across multiple products and services.
We are expanding globally and are looking for motivated Business Development & Marketing Representatives to help grow the UTOPOS ecosystem.
Responsibilities
Promote awareness of the UTOPOS ecosystem.
Introduce individuals, communities, and businesses to UTOP.
Build relationships with blockchain communities, influencers, and strategic partners.
Generate qualified leads for partnerships and business opportunities.
Identify merchant adoption opportunities.
Assist with community growth across social media and Web3 platforms.
Represent UTOPOS professionally in online and offline communities.
Compensation
This is a commission-based opportunity.
Representatives earn commissions in UTOP based on qualified business generated for the UTOPOS ecosystem. Commission terms will be provided during onboarding and are paid only after qualifying milestones have been successfully completed.
Top performers may be offered long-term positions and leadership opportunities as UTOPOS expands globally.
Qualifications
Experience in marketing, sales, or business development.
Interest in blockchain, cryptocurrency, or Web3.
Strong communication skills.
Self-motivated and results-oriented.
Ability to work independently.
Existing crypto or business network is a plus but not required.
What We're Looking For
We're seeking individuals who enjoy building communities, creating partnerships, and helping grow innovative blockchain ecosystems. This is an opportunity to participate in the growth of a long-term project while earning performance-based rewards.
Important
Representatives are expected to communicate accurately about UTOPOS and UTOP. Misleading statements, guarantees of profits, or investment promises are strictly prohibited. All marketing must be factual and professional.
If you're passionate about Web3 and business development and want to help build the future of decentralized commerce, we'd love to hear from you.
Company: UTOPOS
Location: Remote (Worldwide)
Compensation: Commission-Based (Paid in UTOP)
About UTOPOS
UTOPOS is building a decentralized ecosystem that connects blockchain technology with commerce, gaming, sports, payments, and future smart city development. UTOP is the ecosystem's native digital currency, designed for use across multiple products and services.
We are expanding globally and are looking for motivated Business Development & Marketing Representatives to help grow the UTOPOS ecosystem.
Responsibilities
Promote awareness of the UTOPOS ecosystem.
Introduce individuals, communities, and businesses to UTOP.
Build relationships with blockchain communities, influencers, and strategic partners.
Generate qualified leads for partnerships and business opportunities.
Identify merchant adoption opportunities.
Assist with community growth across social media and Web3 platforms.
Represent UTOPOS professionally in online and offline communities.
Compensation
This is a commission-based opportunity.
Representatives earn commissions in UTOP based on qualified business generated for the UTOPOS ecosystem. Commission terms will be provided during onboarding and are paid only after qualifying milestones have been successfully completed.
Top performers may be offered long-term positions and leadership opportunities as UTOPOS expands globally.
Qualifications
Experience in marketing, sales, or business development.
Interest in blockchain, cryptocurrency, or Web3.
Strong communication skills.
Self-motivated and results-oriented.
Ability to work independently.
Existing crypto or business network is a plus but not required.
What We're Looking For
We're seeking individuals who enjoy building communities, creating partnerships, and helping grow innovative blockchain ecosystems. This is an opportunity to participate in the growth of a long-term project while earning performance-based rewards.
Important
Representatives are expected to communicate accurately about UTOPOS and UTOP. Misleading statements, guarantees of profits, or investment promises are strictly prohibited. All marketing must be factual and professional.
If you're passionate about Web3 and business development and want to help build the future of decentralized commerce, we'd love to hear from you.
Payment in Crypto