ViwoApp
Trust & Reputation Protocols for Consumer Crypto
Abstract
ViWoApp introduces a Solana-native protocol stack for trust, reputation, and sustainable value distribution in consumer crypto applications. The system addresses fundamental ecosystem problems that have blocked mainstream adoption: bot-infested engagement, weak on-chain identity, unsustainable token emissions, and prohibitive transaction costs.
The protocol stack includes four core innovations:
- ●The 5A Reputation Protocol — Open-source anti-Sybil infrastructure that scores users across five dimensions, making bot farming economically irrational
- ●The SSCRE Protocol — A Self-Sustaining Circular Reward Economy that solves the token death spiral through a 6-layer funding hierarchy
- ●Portable Decentralized Identity — On-chain DIDs with reputation scores that travel across the Solana ecosystem
- ●Gasless UX Layer — Account abstraction and session keys enabling mainstream-friendly interactions
Every protocol is MIT licensed and available as a public good for the entire Solana ecosystem. ViWoApp, a social application for the crypto community, serves as the reference implementation demonstrating these protocols in production.
2. The Solution: ViWo Protocol Stack
ViWoApp introduces a modular protocol stack that addresses each infrastructure gap. These protocols are designed as public goods — reusable by any Solana application, not locked to a single platform.
Protocol Architecture
| Layer | Components |
|---|---|
| Application | ViWoApp Social Platform (Reference Implementation) |
| Core Protocols | 5A Protocol (Anti-Sybil) • SSCRE (Rewards) • Identity (DID) |
| Infrastructure | Governance (veVCoin) • Staking • Gasless UX |
| Blockchain | Solana — $0.00025/tx • 400ms blocks • 4,000+ TPS |
Trust and Identity Layer
Problem solved: Weak on-chain identity, no portable reputation
The Identity Protocol provides:
- ●Decentralized Identifiers (DIDs) stored on Solana, owned by users
- ●Verification tiers from basic wallet connection to full KYC
- ●Portable reputation that travels across the ecosystem
- ●Profile ownership — your identity is yours, not a platform's property
Other Solana applications can query identity status and reputation scores, creating an ecosystem-wide trust layer.
Reputation Layer: 5A Protocol
Problem solved: Bots, fake engagement, no anti-Sybil infrastructure
The 5A Reputation Protocol scores every user across five dimensions:
- ●Authenticity — Identity verification strength
- ●Accuracy — Content quality and community feedback
- ●Agility — Response time and engagement patterns
- ●Activity — Consistent platform participation
- ●Approved — Community standing and trust history
High scores earn multiplied rewards. Low scores (bots, spam) earn almost nothing. The algorithm is transparent, open-source, and available for any project to integrate.
Sustainability Layer: SSCRE Protocol
Problem solved: Token death spirals, unsustainable emissions
The Self-Sustaining Circular Reward Economy ensures rewards never run out through:
- ●Three-phase lifecycle: Emission → Reserve → Perpetual
- ●6-layer funding hierarchy with multiple backup sources
- ●Deflationary design by Year 5
- ●Governance-controlled parameters for long-term adaptation
This is the first proven model for perpetual token rewards without infinite inflation.
Gasless UX Layer
Problem solved: Gas friction, crypto expertise requirements
The UX layer provides:
- ●Session keys for batched, gasless transactions
- ●Account abstraction hiding blockchain complexity
- ●Paymaster integration for sponsored transactions
- ●Mobile-first design compatible with Solana Mobile Stack
Users interact with applications without thinking about blockchain mechanics.
Public Good Commitment
All protocols are MIT licensed and publicly available:
| Protocol | Purpose | License |
|---|---|---|
| 5A Protocol | Anti-Sybil reputation scoring | MIT |
| SSCRE Protocol | Sustainable reward economics | MIT |
| Identity Protocol | Portable DID and verification | MIT |
| Governance Protocol | veVCoin voting system | MIT |
| Staking Protocol | Lock and earn mechanics | MIT |
| Gasless UX | Session keys and paymaster | MIT |
This infrastructure is designed for ecosystem adoption, not platform lock-in.
3. The 5A Reputation Protocol
The 5A Protocol is ViWoApp's core contribution to Solana infrastructure: a transparent, composable reputation system that makes bot farming economically irrational.
The Five Dimensions
Every user is scored from 0-100% on five dimensions:
| Star | Name | What It Measures |
|---|---|---|
| A | Authenticity | KYC completion, profile verification, account age, identity strength |
| A | Accuracy | Content quality, factual accuracy, community feedback on contributions |
| A | Agility | Response time, engagement speed, adaptability to platform features |
| A | Activity | Daily actions, posting frequency, platform usage consistency |
| A | Approved | Community standing, trust level, reputation history |
How Scores Translate to Rewards
Your 5A score determines your reward multiplier:
- ●50% average = 1.0x multiplier (baseline)
- ●100% average = 2.0x multiplier (maximum)
- ●0% average = 0.0x multiplier (earn nothing)
All users start at 50% on each dimension — a neutral position. Behavior determines whether you rise or fall.
User Progression
The system naturally segments users based on engagement patterns:
| Inactive | → | Lurker | → | Casual | → | Active | → | Power User |
|---|---|---|---|---|---|---|---|---|
| 0.06x | 0.46x | 0.95x | 1.40x | 1.74x |
Inactive users (ghost accounts) earn almost nothing. Power users (verified, active, quality contributors) earn nearly double the baseline.
Anti-Sybil Mechanics
The 5A Protocol makes bot farming economically irrational:
- ●Bots cannot build Authenticity without real identity verification
- ●Automated posting patterns are detected and penalized in Agility
- ●Low-quality spam fails Accuracy checks
- ●Coordinated fake engagement is flagged in Approved status
Ecosystem API
Other Solana applications can query 5A scores:
GET /api/v1/reputation/{wallet_address}
→ { authenticity: 72, accuracy: 65, agility: 80, activity: 55, approved: 68, composite: 68 }This enables ecosystem-wide bot filtering without each project building detection from scratch.
4. SSCRE Protocol
The Self-Sustaining Circular Reward Economy (SSCRE) Protocol solves the fundamental sustainability problem that has killed every previous SocialFi project.
The Death Spiral Problem
Previous platforms faced an impossible choice:
Option A: Print tokens forever
Result: Inflation destroys value. Early holders dump. Token becomes worthless.
Option B: Stop rewards when the pool runs out
Result: Users leave when rewards end. Platform dies.
Both paths lead to failure. SSCRE introduces a third path.
Dynamic Reward Allocation
The key innovation that enables sustainable economics is Dynamic Reward Allocation — a logarithmic scaling mechanism that adjusts how much of the monthly reward pool is actually distributed based on active user count.
The Formula:
| Users | Allocation % | Per-User Reward |
|---|---|---|
| 1,000 | 5% | Higher per-user share |
| 100,000 | ~62% | Moderate per-user share |
| 1,000,000 | ~85% | Lower per-user share |
| 1,000,000,000 | 90% (max cap) | Minimum per-user share |
Why This Matters:
- ●Fair at all stages — Early users don't exhaust the pool; late users still receive meaningful rewards
- ●Reserve accumulation — Unused allocation (the difference between actual % and 100%) is saved to reserves
- ●Enables deflation — Because only a portion of available tokens are emitted, burn mechanisms can exceed emissions by Year 5
- ●1B user cap — Maximum 90% allocation ensures ~10% of each month's potential emission is preserved regardless of growth
This mechanism is why SSCRE can achieve deflation by Year 5: the token recapture rate (~40%) exceeds the actual emission rate once Dynamic Allocation limits distribution.
Three-Phase Lifecycle
| YEARS 1-5 | YEARS 6-10 | YEAR 11+ | |
|---|---|---|---|
| Phase | Emission | Reserve | Perpetual |
| Source | 350M reward pool | ~84M saved reserves | Scheduled minting |
| Rate | ~5.83M/month max | No new tokens needed | 250M every 5 years |
| Mechanism | Dynamic Allocation → reserves | Layer 0 + Layer 1 funding | Sustainable indefinitely |
Phase 1: Emission (Years 1-5)
The initial 350M reward pool has a maximum distribution of ~5.83M VCoin per month. However, Dynamic Reward Allocation means only a portion is actually distributed based on user count. Undistributed tokens accumulate in reserve funds, building the safety net for future phases.
Phase 2: Reserve (Years 6-10)
The reserve fund (~84M VCoin accumulated from Years 1-5) sustains rewards without any new token creation. Zero inflation during this period.
Phase 3: Perpetual (Year 11+)
Scheduled minting of 250M VCoin every 5 years provides long-term sustainability. This is transparent, predictable, and governance-controlled.
6-Layer Funding Hierarchy
When the initial emission pool is exhausted, SSCRE draws from multiple sources in priority order:
| Layer | Source | Purpose |
|---|---|---|
| L0 | Unused Allocation | First safety net from Years 1-5 savings |
| L1 | Reserve Fund | Main funding source for Years 6-10 |
| L2 | Scheduled Minting | Primary long-term source after reserves |
| L3 | Buyback Recycling | Revenue buybacks split between burn and rewards |
| L4 | Profit Buybacks | Platform profit converted to reward funding |
| L5 | Fee Recycling | Emergency backup from platform fees |
Higher layers are used first. Lower layers activate only when higher layers are insufficient.
Why This Works
- ●Accumulation — Unused rewards during growth phases build reserves
- ●Recycling — Platform revenue and fees flow back into rewards
- ●Predictability — Scheduled minting provides transparent long-term funding
- ●Governance — Community controls parameters to adapt to conditions
The death spiral is broken. Rewards continue indefinitely.
Protocol Availability
SSCRE is fully documented and MIT licensed. Any token project can implement sustainable rewards using this model.
5. Technology and Security
Why Solana
The ViWo Protocol Stack is built exclusively on Solana. This is not a multi-chain hedge — it's a deliberate technical decision.
| Capability | Solana | Ethereum | Why It Matters |
|---|---|---|---|
| Transaction Cost | $0.00025 | $2-50 | Social actions require thousands of micro-transactions |
| Block Time | 400ms | 12 seconds | Real-time engagement needs instant feedback |
| Finality | ~1 second | Minutes | Users expect immediate confirmation |
| TPS | 4,000+ sustained | ~15 | Consumer apps need to scale |
These protocols are only viable on Solana. No other chain offers the cost, speed, and throughput combination required for social-scale applications.
Security Architecture
Smart Contract Security
- ●Anchor framework for type-safe Solana programs
- ●Planned audits with Neodyme and OtterSec
- ●Bug bounty program post-launch
- ●Multi-sig deployment controls
Treasury Security
- ●3-of-5 multisig requirement
- ●48-hour timelock on significant transactions
- ●Transparent on-chain accounting
Oracle Security
- ●Pyth Network for decentralized price feeds
- ●TWAP protection against manipulation
- ●Multiple oracle fallbacks
Open-Source Infrastructure
All core protocols are publicly available:
| Component | License | Availability |
|---|---|---|
| Smart Contracts | MIT | Devnet (Beta) — github.com/MohaMehrzad/VCoin-V2 |
| Developer SDK | MIT | Beta — npmjs.com/@viwoapp/sdk |
Ecosystem Contribution
ViWoApp provides reusable infrastructure for the Solana ecosystem:
Identity SDK
Other Solana applications can verify identities and query reputation scores.
5A Anti-Sybil API
Projects can filter bots using reputation data without building detection systems.
Reputation Query API
Trust scores available for ecosystem-wide use.
This positions ViWoApp as core infrastructure, not just an application.
6. Reference Implementation: ViWoApp
ViWoApp is a social platform for the crypto community that demonstrates the ViWo Protocol Stack in production. It serves as the proving ground for these protocols before ecosystem-wide adoption.
Why a Social Application?
Social platforms are the hardest test case for consumer crypto infrastructure:
- ●Highest bot pressure — Spam and fake engagement are endemic
- ●Most micro-transactions — Every like, comment, and share needs to be cheap
- ●Strongest UX requirements — Users expect instant, frictionless interactions
- ●Clear sustainability challenge — Engagement rewards must work long-term
If the protocols work for social, they work for gaming, commerce, and other consumer applications.
Platform Modules
| Module | Protocol Demonstrated |
|---|---|
| Identity Module | Portable DID, verification tiers |
| Content Module | 5A-scored engagement, anti-spam |
| Rewards Module | SSCRE sustainable distribution |
| Exchange Module | Gasless swaps via Jupiter |
| Staking Module | Lock mechanics, tier benefits |
| Governance Module | veVCoin voting system |
Creator and User Economics
The reference implementation demonstrates protocol benefits for end users:
For Creators:
- ●100% of tips and direct earnings (no platform extraction)
- ●Quality content rewarded through 5A multipliers
- ●Portable reputation that travels across platforms
For Users:
- ●Every engagement action can earn rewards
- ●Quality participation multiplied by 5A score
- ●Identity and reputation owned by the user
Success Metrics
The reference implementation proves the protocols work:
| Metric | Target (Year 1) | Target (Year 2) |
|---|---|---|
| Verified Users | 10,000+ | 50,000+ |
| Bot Rate | <2% | <1% |
| Protocol Uptime | 99.9% | 99.9% |
| SDK Integrations | — | 5+ projects |
Current Implementation Progress
As of December 2025, the MVP is ~95% complete and in the Testing & Debugging phase:
| Component | Status | Notes |
|---|---|---|
| Mobile App (React Native) | ~95% complete | MVP testing, UI/UX refinements |
| Backend API (NestJS) | ~95% complete | 35+ modules, MVP testing |
| 5A Scoring Engine | 100% complete | 5 calculators, streak HP, history tracking |
| Session Key Management | 100% complete | 3 presets (Social, Creator, Full) |
| Passkey Authentication | 100% complete | WebAuthn/FIDO2 support |
| Behavior Analytics | 100% complete | Persona classification, churn prediction |
| Onboarding Flow | 100% complete | 6-screen flow with passkey setup |
| Staking & Rewards | 100% complete | veVCoin, SSCRE 6-layer (Day 4) |
| Vouch & Trust System | 100% complete | 3-vouch, clusters, badges (Day 5) |
| Governance Module | 100% complete | Conviction voting, delegates (Day 6) |
| Exchange Module | 100% complete | Jupiter DEX integration (Day 6) |
| AI Assistant | 100% complete | GPT-4, 6 actions (Day 6) |
| Energy System | 100% complete | Rate limiting, regeneration (Day 6) |
| Recommendations | 100% complete | 5A-weighted feed (Day 6) |
| Test Coverage | 477+ tests | 377 blockchain + 100 backend |
Current Phase: MVP Testing & Debugging with UI/UX refinements underway. Beta launch targeted for Q1 2026.
7. Token Economics
VCoin (VIWO) is the native utility token that coordinates the ViWo Protocol Stack.
Supply
| Parameter | Value |
|---|---|
| Total Supply | 1,000,000,000 (1 Billion) |
| Token Standard | SPL Token (Solana) |
| Decimals | 9 |
| TGE Circulating | ~11.5% |
Allocation
| Category | Percentage | Amount |
|---|---|---|
| Ecosystem Rewards | 35% | 350,000,000 VCoin |
| Treasury/DAO | 20% | 200,000,000 VCoin |
| Team | 15% | 150,000,000 VCoin |
| Public Sale | 8% | 80,000,000 VCoin |
| Private Sale | 8% | 80,000,000 VCoin |
| Marketing | 6% | 60,000,000 VCoin |
| Liquidity | 5% | 50,000,000 VCoin |
| Advisors | 3% | 30,000,000 VCoin |
Vesting Schedules
Token releases are structured to align long-term incentives:
| Category | TGE Unlock | Cliff | Vesting |
|---|---|---|---|
| Team | 0% | 12 months | 36 months linear |
| Advisors | 0% | 6 months | 18 months linear |
| Seed | 0% | 12 months | 24 months linear |
| Private | 10% | 6 months | 18 months linear |
| Public | 50% | None | 3 months linear |
| Liquidity | 100% | N/A | Locked 24 months |
| Rewards | Programmatic | N/A | 60 months |
Token Utility
VCoin coordinates protocol participants:
- ●Protocol Rewards — Distributed through SSCRE to quality participants
- ●Staking — Lock VCoin for yield and governance power
- ●Governance — Vote on protocol parameters with veVCoin
- ●Fees — Pay for premium features and services
- ●Commerce — Native token for marketplace transactions
Deflationary Design
VCoin becomes deflationary by Year 5, with an annual supply reduction of -0.42%. This is achieved through:
- ●Velocity Burn — A portion of tokens flowing through protocols are permanently destroyed
- ●Fee Burns — 20% of collected fees are burned
- ●Buyback and Burn — Revenue is used to purchase and destroy tokens
8. Governance
The ViWo Protocol Stack is designed for progressive decentralization, with community governance at its core.
veVCoin: Vote-Escrowed Tokens
To participate in governance, users lock VCoin for a chosen duration (1 week to 4 years). Longer locks grant more voting power:
| Lock Duration | Voting Power Multiplier |
|---|---|
| 1 week | 1.0x |
| 1 year | ~1.7x |
| 4 years | 4.0x |
Voting power decays linearly as the lock approaches expiration, incentivizing long-term commitment.
Governance Tiers
| Tier | Requirement | Capabilities |
|---|---|---|
| Community | 1+ veVCoin | Vote on proposals |
| Delegate | 1,000+ veVCoin | Create proposals |
| Council | 10,000+ veVCoin | Fast-track proposals |
What Can Be Governed
The community controls critical protocol parameters:
- ●Emission rates and reward distribution
- ●Fee structures and burn rates
- ●Treasury allocations and grants
- ●Protocol upgrades and new features
- ●Partnership and integration decisions
Security Measures
- ●Timelock — 48-hour delay before governance actions execute
- ●Multisig — Treasury requires 3-of-5 signatures
- ●Quorum Requirements — Minimum participation thresholds for different proposal types
Progressive Decentralization
The protocol launches with a core team managing day-to-day operations. Over time, more decisions transfer to governance:
- ●Year 1 — Core parameters governed
- ●Year 2 — Treasury grants governed
- ●Year 3+ — Full protocol control transitions to DAO
9. Roadmap
Protocol development follows a 36-month rollout across four phases.
Phase 1: Foundation (Months 1-12)
The foundation phase delivers core protocol infrastructure across four quarterly milestones:
Milestone 1 (Months 1-3): Core Infrastructure
- ●5A Reputation Protocol — Anti-Sybil scoring smart contracts
- ●Identity Protocol — Portable DID system on Solana
- ●Gasless UX Layer — Session keys and account abstraction
Deliverable: Core protocols deployed to devnet, documentation complete
Milestone 2 (Months 4-6): Economic Infrastructure
- ●SSCRE Protocol ✅ Backend implementation complete (Day 4)
- ●Governance Protocol ✅ Backend implementation complete (Day 6)
- ●Staking Module ✅ Full veVCoin calculation and tiers (Day 4)
- ●Exchange Integration ✅ Jupiter DEX integration (Day 6)
Deliverable: All economic protocols operational in backend, 100+ integration tests passing
Advanced Features Delivered (Days 5-6):
- ●✅ Vouch & Trust System — 3-vouch social proof with stake
- ●✅ AI Assistant — GPT-4 powered natural language interface
- ●✅ Energy System — Content rate limiting
- ●✅ Recommendations — 5A-weighted personalized feed
Milestone 3 (Months 7-9): Mobile Applications
- ●iOS Application — Native app demonstrating all protocols
- ●Android Application — Native app with full feature parity
Deliverable: Mobile apps in app stores, 5,000+ verified users
Milestone 4 (Months 10-12): Web Platform + SDK
- ●ViWoApp Web Platform — Full reference implementation
- ●SDK v1 Preview — Developer tools for ecosystem integration
Deliverable: 10,000+ users, SDK documentation, ecosystem ready
Phase 1 Success Metrics: 10,000+ verified users, all code public and MIT licensed, bot rate <2%, mobile-first adoption
Phase 2: Ecosystem (Months 12-24)
The ecosystem phase expands protocol adoption:
- ●Identity SDK v1 — Public APIs for ecosystem integration
- ●5A Query API — External projects can query reputation
- ●Developer Documentation — Comprehensive integration guides
- ●SDK Partnerships — 5+ Solana projects integrating protocols
Success Metrics: 50,000+ active users, 5+ SDK integrations, protocol documentation complete
Phase 3: Scale (Months 24-30)
The scale phase proves sustainability:
- ●SSCRE Phase 2 Transition — Reserve funding begins
- ●Cross-Platform Identity — Reputation portability expanded
- ●Enterprise APIs — White-label protocol access
- ●Marketplace Expansion — Commerce module growth
Success Metrics: 150,000+ users, positive token recapture, marketplace GMV growth
Phase 4: Maturity (Months 30-36)
The maturity phase achieves full decentralization:
- ●Full DAO Transition — Community controls all parameters
- ●Protocol v2 — Next-generation improvements based on learnings
- ●Global Expansion — Multi-language, regional partnerships
- ●Ecosystem Grants — Treasury funds external builders
Success Metrics: 300,000+ users, ecosystem partnerships established, protocol self-sustaining
10. Team
ViWoApp is built by a team with deep expertise across media, technology, and crypto.
Leadership
Ali Zandifar — Chief Executive Officer
Mainstream media subject matter expert with experience building content platforms and community ecosystems.
Co-Founders
Amir Nasehi
Software development company background. Expertise in startup ecosystem management and scaling technical teams.
Mani Majd
12 years at Microsoft. Deep experience in cybersecurity and corporate technology infrastructure.
Moha Mehr
Solana native and AI early adopter. Product management expertise with focus on decentralized applications.
Marketing
Jasmine NK — Chief Marketing Officer
10 years marketing expertise. Specialist in animation, motion graphics, and social media strategy.
Team DNA
The team is united by shared values:
- ●Solana Native — Deep understanding of the Solana ecosystem
- ●Open Source — Commitment to public goods and transparency
- ●Infrastructure Focus — Building primitives, not just applications
- ●Sustainable Design — Long-term thinking over short-term gains
Combined Experience
40+ years across technology, media, crypto, and marketing.
11. Why Now
Multiple market forces are converging to create the perfect timing for consumer crypto infrastructure.
Ecosystem Maturity
Solana is Ready
With over $10B in DeFi TVL, institutional ETF interest, and proven stability, Solana has matured into a platform capable of supporting mainstream consumer applications.
UX Has Improved
Gasless transactions, seedless wallets, and account abstraction have finally made Web3 accessible to mainstream users.
Developer Tooling is Mature
Anchor, Solana Mobile Stack, and robust RPC infrastructure enable rapid, secure development.
Market Demand
Consumer Apps Need Infrastructure
Every social, gaming, and engagement project on Solana needs anti-bot protection, identity, and sustainable rewards. Today, each builds from scratch.
Platform Fatigue is Real
TikTok bans, X instability, and growing distrust of centralized platforms have users looking for alternatives.
Crypto Adoption is Widespread
Over 650 million people globally now own cryptocurrency. The user base for consumer crypto is larger than ever.
Solana Foundation 2026 Alignment
ViWoApp directly addresses the Solana Foundation's stated priorities:
| Foundation Priority | ViWo Protocol Implementation |
|---|---|
| Consumer Applications | Reference implementation proving protocols work |
| Identity and Social Proof | Portable DID, 5A reputation system |
| Safety Infrastructure | Anti-Sybil scoring as ecosystem public good |
| Open Source | All protocols MIT licensed |
The ViWo Protocol Stack addresses all four priority areas with production-ready solutions.
The Window is Open
All signals converge now. The infrastructure is ready. The ecosystem needs these primitives. The timing is right.
12. Conclusion
The Vision
We envision a Solana ecosystem where:
- ●Trust is composable — Reputation scores travel across applications
- ●Bots are economically irrational — Anti-Sybil infrastructure is a public good
- ●Rewards are sustainable — No more token death spirals
- ●UX is invisible — Users don't think about blockchain mechanics
What We're Building
More than an application, ViWoApp is infrastructure for consumer crypto:
- ●Open-source protocols that benefit the entire Solana ecosystem
- ●Sustainable economics that reward participation indefinitely
- ●Reusable primitives that other developers can integrate
- ●Decentralized governance that gives power to the community
Public Good Commitment
Every protocol is MIT licensed. Every specification is public. The goal is ecosystem adoption, not platform lock-in.
Let's Build Together
"We're not asking you to believe.
We're asking for a chance to prove it."
Website: viwoapp.com
X: @ViWoApp
Telegram: @ViWoApp
Discord: discord.gg/viwoapp
GitHub: github.com/MohaMehrzad/VCoin-V2
This whitepaper is for informational purposes only and does not constitute financial advice, an offer to sell, or a solicitation of an offer to buy any tokens. VCoin is a utility token designed for use within the ViWo Protocol ecosystem. Please conduct your own research and consult with qualified advisors before making any investment decisions.
Version: 2.2
Date: December 26, 2025
MVP Status: ~95% Complete (Testing & Debugging Phase)
License: This whitepaper is released under Creative Commons Attribution 4.0 International (CC BY 4.0)
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