feat(content): implement advanced NFT tokenization, marketplace

[mijinummi]

🚀 Build Advanced Content Tokenization and Marketplace (#95)

Overview

This PR introduces a comprehensive content tokenization and decentralized marketplace system for TeachLink. It enables dynamic NFT minting, automated royalty distribution, content licensing, fractional ownership, analytics tracking, DAO-based curation, and insurance-backed protection mechanisms.

This implementation transforms TeachLink into a full creator economy infrastructure with institutional-grade marketplace capabilities.

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🧱 Architecture Overview

New/Extended Modules

contracts/

• teachlink/
  • content_nft.rs
  • marketplace.rs
  • royalty.rs
  • licensing.rs
  • fractional.rs
  • analytics.rs
  • recommendation.rs
  • collaboration.rs
• governance/
  • curation.rs
• insurance/
  • content_protection.rs

Indexer updated to support:

• Analytics aggregation
• Recommendation signals
• Marketplace tracking
• Revenue dashboards

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✨ Features Implemented

1️⃣ Advanced NFT Tokenization

• Dynamic metadata with versioning
• Content provenance tracking
• Royalty configuration at mint
• License-aware metadata
• Quality scoring integration
• Co-ownership support

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2️⃣ Decentralized Marketplace

• Fixed price listings
• Escrow-based purchases
• Automated royalty deduction
• Seller payout logic
• Order matching framework
• Marketplace event emissions

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3️⃣ Royalty Distribution & Revenue Sharing

• Multi-recipient revenue splits
• Platform fee integration
• Governance fee routing
• Automatic distribution on sale
• Support for co-owners

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4️⃣ Content Licensing & Rights Management

• Personal, Commercial, Exclusive, Subscription licenses
• License issuance and expiration tracking
• License event logging
• Rights verification integration

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5️⃣ Content Fractionalization

• Fractional vault creation
• Share issuance
• Investor participation
• Proportional revenue distribution
• Fraction ownership tracking

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6️⃣ DAO-Based Curation & Quality Scoring

• Governance voting on content quality
• Weighted voting support
• Metadata quality score updates
• Transparent scoring history

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7️⃣ Content Analytics & Usage Tracking

Tracked metrics:

• Views
• Purchases
• Revenue
• License grants

Events emitted for indexer aggregation.

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8️⃣ Recommendation & Discovery

• Tag-based similarity matching
• Quality-weighted ranking
• Trending signals via analytics
• Indexer-ready recommendation hooks

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9️⃣ Collaboration & Co-Ownership

• Add/remove co-owners
• Revenue split enforcement
• Shared royalty configuration
• Creator collaboration workflows

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🔟 Content Insurance & Protection

• Insurance policy creation
• Premium tracking
• Dispute filing mechanism
• Governance-based claim resolution
• Payout triggers

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🔒 Security Considerations

• Reentrancy protections in marketplace logic
• Escrow enforcement for asset transfers
• Royalty percentage caps
• Validation of share distribution totals
• Role-based permission checks
• Safe math operations
• Event-driven transparency

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🧪 Test Scenarios Covered

• NFT minting with dynamic metadata
• Marketplace listing & purchase
• Royalty distribution verification
• Fractional vault creation and share purchases
• Revenue distribution to investors
• Governance-based quality voting
• License issuance and validation
• Insurance claim lifecycle
• Co-ownership revenue splitting

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📊 Impact

This PR upgrades TeachLink from a basic NFT system to a complete decentralized content economy platform.

Creators can:

• Tokenize educational content
• Monetize via royalties
• License content flexibly
• Fractionalize high-value assets
• Collaborate with other creators
• Insure their digital property

Investors can:

• Acquire fractional shares
• Earn proportional revenue
• Participate in governance curation

Users benefit from:

• Transparent quality scoring
• Recommendation-based discovery
• Verified licensing
• Protected marketplace transactions

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🚀 Future Extensions (Optional Enhancements)

• Advanced auction mechanisms
• Cross-chain marketplace support
• AI-driven recommendation scoring
• Reputation-based creator ranking
• Automated insurance premium pricing model

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✅ Status

All acceptance criteria for Issue #95 have been implemented and validated.

Closes #95

[github-actions]

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