NFT Sentinel
The NFT market did not disappear. It changed.
Built for the NFTs that remain after the market hype fades.
NFT Sentinel™ is being prepared as a structured monitoring and review layer for metadata integrity, original content accessibility, external storage status, observable suspicious-activity signals, and practical review workflows.
Disclaimer. NFT Sentinel provides informational monitoring signals only and does not provide financial advice, legal advice, smart contract audits, or security guarantees.
The NFT market did not disappear. It changed.
Annual NFT data from 2021 to 2025 shows that the market did not simply disappear. Sales value declined after the speculative peak, but transaction activity and unique participant counts remained substantial while average sale prices compressed. This indicates a structural shift from high-priced speculative trading toward lower-priced, long-tail ownership and NFT ownership 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 signals to review 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
Current pain points
NFT ownership data, NFT condition, 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 status is not structured as NFT-level review data
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
keep the NFT visible, re-check its status, monitor changes, hide or isolate it in their workflow, or flag it for further review. Operators also need repeatable evidence and reports for user inquiries.
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 .