NFT Sentinel
The NFT market did not disappear. It changed.
Disclaimer. NFT Sentinel provides informational inspection and review signals only and does not provide financial advice, legal advice, smart contract audits, or security guarantees.
From speculation to long-term ownership.
Annual NFT data from 2021 to 2025 shows that the market did not simply disappear. Sales value declined after the speculative peak, while transaction activity and unique participant counts remained substantial. Average sale prices compressed, indicating a shift from high-priced speculative trading toward lower-priced, long-tail ownership and long-term NFT review needs. [1] [2] [3]
Core NFT Market Trend by Year
Sales value, total transactions, average sale price, and unique market participants show how the NFT market changed after the 2021–2022 speculative cycle. [1]
Unique sellers and unique buyers are included in the legend and disabled by default.
| Year | Sales (USD) | Total Txns | Avg Sale (USD) | Unique Sellers | Unique Buyers |
|---|---|---|---|---|---|
| 2021 | $15,767,563,332.87 | 34,070,372 | $462.79 | 3,663,350 | 5,043,458 |
| 2022 | $23,836,352,374.25 | 56,530,105 | $421.66 | 3,753,360 | 5,436,710 |
| 2023 | $8,738,487,167.36 | 90,927,038 | $96.10 | 3,832,750 | 4,598,516 |
| 2024 | $8,876,058,525.66 | 72,090,386 | $123.12 | 4,116,205 | 7,665,656 |
| 2025 | $5,634,353,298.81 | 58,245,470 | $96.73 | 3,067,419 | 5,193,290 |
This table summarizes historical market data only and is not a prediction of future NFT market activity, value, liquidity, or transaction volume.
Why NFT ownership review still matters
When trading is active, users focus on price, listings, and volume. When the market slows and project operations weaken, the questions become different.
Is the NFT still displayed correctly?
Users need to confirm whether the NFT shown in a wallet or marketplace still matches its underlying metadata and source response.
Can the original data still be accessed?
NFT images and metadata may depend on centralized servers, IPFS, or external storage. Displayed content and source accessibility can diverge. [4]
Are there observable risk signals before interacting?
Users need to review observable suspicious-activity signals, ownership changes, storage failures, and public project activity and continuity before taking further action.
NFTs are becoming long-term ownership records
NFTs are not limited to digital collectibles. They may represent game items, memberships, certificates, tickets, access rights, and other utility-based use cases. [5]
Even when liquidity declines, unique token IDs and ownership records remain on-chain as long as the blockchain continues to operate. [6]
Current pain points
NFT ownership data, NFT state, source accessibility, and observable NFT signals are often scattered across different tools. This makes consistent review difficult for both individual users and NFT operators.
NFT state is not structured as review-ready information
Wallets and marketplaces show owned NFTs and images, but users still need to separately verify metadata, original artwork, external storage, and whether the displayed content or metadata response is cached or source-based.
Observable NFT signals and public project activity are hard to review together
A normally displayed NFT may still require review for source availability, storage continuity, observable suspicious-activity indicators, and project-operation signals. Users need a combined view of trading activity, ownership movement, ownership and transaction-flow patterns, storage access, observable indicators, public project activity and continuity signals.
There is no consistent basis for next-step decisions
Users need a consistent basis for deciding whether to keep the NFT visible, re-check its state, monitor changes, hide or isolate it in their workflow, or flag it for further review.
Where existing NFT tools leave gaps
Existing NFT tools are useful, but they are built for different primary tasks. Wallets help users see owned NFTs. Marketplaces organize listings, pricing, trading activity, and collection views. Block explorers expose on-chain transactions and token activity. Portfolio and analytics tools help users understand holdings, floor prices, and market trends. Security tools may surface suspicious-asset or threat-related signals.
The gap appears when users need a repeatable ownership-review workflow that evaluates NFT state over time.
| Tool type | Primary role | Review gap |
|---|---|---|
| Wallets | Display owned NFTs and basic token information. | Usually do not provide a structured review of metadata, media accessibility, storage dependencies, and long-term NFT state. |
| Marketplaces | Support listings, trading, pricing, and collection discovery. | Primarily organized around market activity rather than long-term ownership review. |
| Block explorers | Expose transactions, token transfers, contracts, and address activity. | Useful for raw on-chain inspection, but not structured as an NFT-level state review workflow. |
| Portfolio and analytics tools | Track holdings, floor prices, collection performance, and market trends. | Often focused on valuation and market context rather than metadata, media, storage, and continuity review. |
| Security tools | Surface suspicious-asset, wallet, or threat-related signals. | Often focus on threat signals rather than a broader metadata, media, storage, ownership, and project-continuity review workflow. |
- The gap is not ownership visibility.
- The gap is repeatable NFT state review.
The missing evaluation layer
What is missing is not another wallet, marketplace, explorer, or price dashboard. What is missing is a structured evaluation layer for NFT ownership records.
As NFTs become long-term ownership records, the review problem extends beyond ownership visibility. Users and operators need clearer ways to examine NFT condition, content availability, storage dependencies, public ownership context, and future risk indicators without treating every signal as a price, trading, or security-audit output.
NFT State Review
- Metadata integrity signals
- Original content accessibility
- External storage status
- Displayed content vs. source response
Collection Risk Signals
- Suspicious-activity indicator context
- Public ownership and transfer context where available
- Public project activity and continuity indicators
NFT Assessment Outputs
- Combined review output based on available NFT state and risk signals
- Evidence-based issue summaries
- Practical next-step review support
- Visibility, re-check, tracking, isolation, or further-review indicators
NFT State Review describes the nearer-term inspection focus. Broader review signals and NFT Assessment outputs describe directional future review areas and should not be read as guarantees of current availability, coverage, timing, or automated decision-making.
- NFT Sentinel is designed to help organize scattered NFT signals into practical review workflows for long-term ownership review.
- It does not determine NFT value, guarantee safety, provide legal or financial advice, or perform smart contract audits. It provides informational inspection and review signals only.
Research References
- CryptoSlam, NFT Global Sales Volume Index , annual view by sales volume.
- Axios, Report: NFT sales exceeded $17B in 2021 , 2022.
- MarketWatch, NFTs see some resurgence in interest and activity after crypto rally. Here’s why , 2024.
- OpenSea, Decentralizing NFT Metadata on OpenSea , 2021.
- Ethereum.org, Non-fungible tokens (NFT) .
- Ethereum.org, ERC-721 Non-Fungible Token Standard .