Leveraging NFTs for Spectrum Securitization in 6G Networks

Bin Chen; Chen Sun; Peichang Zhang; Shuo Wang; Zhixian Zhou

REVIEW 3 major objections 7 minor 10 references

Leveraging NFTs for Spectrum Securitization in 6G Networks

T0 review · 3 major / 7 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read A blockchain tokenization design turns 6G spectrum access into rentable, fungible assets, giving primary users a revenue incentive to share their idle spectrum.

desk verdict A fresh but flawed ERC404+ERC4907 spectrum securitization scheme whose core token-backing logic is internally inconsistent. read the letter →

arxiv 2411.12347 v1 pith:SPS6YHEV submitted 2024-11-19 cs.CE

Zhixian Zhou , Bin Chen , Chen Sun , Peichang Zhang , Shuo Wang This is my paper · ORCID

classification cs.CE

keywords spectrumsecuritizationdynamicsharing6GnetworksERC404ERC4907fungibletokensnon-fungiblesmartcontracts

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper tries to establish that spectrum securitization built on two Ethereum token standards can solve the incentive problem in dynamic spectrum sharing for 6G: primary users (PUs) who hold spectrum rights will share them if sharing yields revenue. To that end it proposes a system where each spectrum asset is represented by a non-fungible token (NFT), while the same assets are also minted as fungible tokens (FTs) under the ERC404 standard, so ownership can be bought and sold in small fractions. A secondary user (SU) buys FTs, and spends them to rent a Non-Fungible Spectrum Token (NFST) under the ERC4907 standard, obtaining temporary use of the corresponding channel. The paper reports a testnet deployment with one PU and several SUs, and shows minting, metadata upload, FT transfers, and rental transactions executing. If the scheme holds, the starting point for spectrum sharing is not policy coordination but a market where idle spectrum earns its owner an income.

What carries the argument

The load-bearing machinery is the ERC404 standard, a hybrid of ERC20 and ERC721 that makes multiple NFTs splittable: the contract tracks FT balances in wei and mints or burns one NFT per whole FT held by a non-PU. The second piece is the ERC4907 rental standard, which separates an NFST's owner field from its user field and adds an expiration time, so a spectrum resource can be leased temporarily without transferring ownership. Together they do the work of connecting tradable fractions to real, uploaded channel-location metadata, and of making FT both an investment vehicle and the payment medium for spectrum rental.

What would settle it

Mint two whole FTs while uploading metadata for only one channel, then transfer one FT to a non-primary account; if the contract mints an NFT for the second FT, the claimed 1:1 backing between token supply and spectrum assets has failed.

Watch

Extended reading notes

Core claim

The central discovery is a concrete token architecture: a smart contract using ERC404 mints fungible tokens in wei denominations against uploaded spectrum resources, and whenever a non-PU account accumulates at least one whole FT, the contract automatically mints an NFT that points to a specific uploaded channel and location. Fractional FT holdings, such as 0.1 FT, deliberately do not mint an NFT, and when a holder sells enough FTs the corresponding NFT is burned. On top of this, ERC4907 defines an NFST whose ownership stays with the PU while a separate user field records the current renter and expiry time; the renter pays in FTs, so the same token that represents the asset also serves as the currency that rents it. The paper asserts that this design keeps the number of FTs no greater than the number of spectrum resources, keeps the spectrum transparently visible on-chain, and gives PUs a rental revenue stream that incentivizes them to share.

Load-bearing premise

Everything rests on the assumption that each fungible token really is backed by an uploaded spectrum resource, so that minted tokens never outnumber the channels that exist; if that fails, the tokens are not securitized spectrum, they are just numbers on a ledger.

Editorial extensions

If this is right

If the scheme is correct, spectrum access becomes tradeable in arbitrary fractions, so secondary users can buy a foothold in a spectrum asset for as little as 0.1 FT instead of purchasing or licensing the whole channel.
Primary users receive FT rental payments whenever their NFST is rented, creating a direct, on-chain income stream from idle spectrum and removing the main disincentive to sharing.
Because NFTs are minted only against uploaded channel/location metadata, the blockchain provides a public, inspectable record of which spectrum assets exist and whether they are currently occupied.
The ERC4907 rental loop means the same FT serves as both tokenized asset and payment currency, so demand for the asset itself is what funds the rental, a circularity the paper treats as a feature that stabilizes FT liquidity.
A working testnet implementation with one PU and multiple SUs shows the basic transaction flow is executable, though the paper does not claim production readiness.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

A natural extension is to enforce the backing invariant directly in the contract code: require that FT supply growth above some cap is rejected unless matching spectrum metadata has been uploaded, since the paper's mintFT function receives only recipient and amount and never checks the uploaded channel count.
The same ERC404-plus-ERC4907 pattern could be applied to other scarce, location-bound resources such as computing slots, parking spaces, or satellite capacity, where fractional ownership and rental by the same token would give holders liquidity.
If the rental price is denominated in FT, then renting consumes or recirculates FT rather than requiring an external currency, which could make the token's value partly self-sustaining; a testable prediction is that FT price becomes tied to rental demand for the underlying channels.
Before any production use, the scheme would need a legal check: the paper notes that whether the NFT carries ownership or merely transparent display depends on whether the region permits spectrum trading, so the same codebase must be configured differently per jurisdiction.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

The paper grafts ERC404 fractionalization onto ERC4907 rentals for spectrum securitization, which is a genuinely new combination in the NFT-spectrum line of work. The system model is clear, the workflows are sensible, and the Ganache/Remix demo is a nice touch. To its credit, the paper openly calls ERC404 unofficial and experimental, and it cites the prior NFT-spectrum papers ([7], [8], [15]) rather than ignoring them.

The stress-test note holds up, and it lands on the load-bearing part. Figure 3.1 increments totalSupply_NFT by amount_eth, not by the number of uploaded spectrum assets, and there is no check that the minted FT quantity is at most the number of uploaded channels. So the claimed invariant that FTs never exceed spectrum resources is asserted but not enforced by the shown code. More seriously, Figure 3.3 computes NFTNum_mint and NFTNum_burn as wei-denominated balance differences. Since FT balances are stored in wei (1 ETH = 10^18 wei), a 1 FT transfer yields NFTNum_mint = 10^18, not 1. The paper's own tables (Case 1, Case 2) contradict the function as written; the '0.1 FT does not mint an NFT' result only holds if there is an implicit threshold the pseudo-code never shows. This is a load-bearing internal inconsistency, not a cosmetic typo, because the whole securitization story depends on a 1:1 link between whole FTs and spectrum-backed NFTs.

There is also no contract source, only screenshots, so the demo cannot independently confirm the invariant. The self-citation to [15] for NFST minting is fine, and there is no circular fitting; the claims are implementation claims.

Net: the concept is plausible and could be worth another iteration, but this draft is not ready for peer review as is. The authors need to fix the wei-to-whole-token conversion, add the supply-vs-channel check, and publish the actual contract code. The paper is most useful in a reading group as a case study of why pseudo-code can hide logic bugs. I would not cite it in its current form.

Referee Report

3 major / 7 minor

Summary. The paper proposes a blockchain-based spectrum securitization system for 6G dynamic spectrum sharing. It combines the ERC404 standard (a hybrid ERC20/ERC721 token) to mint fungible tokens (FTs) backed by non-fungible spectrum assets and the ERC4907 standard to create rentable Non-Fungible Spectrum Tokens (NFSTs). Primary users (PUs) upload spectrum metadata and mint FTs; secondary users (SUs) purchase FTs and use them to lease NFSTs, obtaining temporary spectrum usage rights. The paper presents pseudo-code for minting, metadata upload, FT transfer, and NFST leasing, and reports a Ganache/Remix demo with three transfer cases.

Significance. If the implementation were correct, the system would offer an interesting and potentially useful mechanism for transparent, tokenized spectrum sharing with a rental market. The paper is among early attempts to apply the experimental ERC404 standard to a networking domain, and the rental-loop design is a reasonable incentive structure. However, the technical core is not demonstrated: the pseudo-code does not implement the claimed 1:1 backing, and the experimental section does not validate the invariant. The contribution is therefore currently an unverified design outline rather than a working system.

major comments (3)

[III.C, Figure 3.3, Tables II–IV] The transfer function computes NFTNum_mint and NFTNum_burn as raw balance differences, but balances are stored in wei (Section III.A: balance[recipient] is a wei-denominated value). Consequently a 1-FT transfer (1e18 wei) yields NFTNum_mint = 1e18 and would mint 1e18 NFTs, while the 0.1-FT transfer in Case 2 yields 1e17 NFTs instead of the reported 0. No conversion from wei to whole FTs and no fractional-threshold check ('balance >= 1 FT') appears in the pseudo-code. The NFT mint/burn counts in Tables II–IV are therefore not the values produced by the presented code, and the 1:1 NFT-per-whole-FT relation is not implemented.
[III.A–B, Figures 3.1 and 3.2] mintFT increments totalSupply_NFT by amount_eth with no verification against the number of uploaded spectrum assets, and updateChannelInfo does not check totalSupply_NFT or enforce any relationship between channelList.length and the FT supply. The claim in Section III.A and the Conclusion that 'the ERC404 standard ensures that the number of FTs does not exceed the number of spectrum resources' is therefore asserted rather than enforced. In the presented code a PU could mint an arbitrary amount of FT without uploading corresponding assets, which would break the token-backing invariant on which the securitization model rests.
[IV, Experimental Result] The experimental section reports successful function calls but does not verify the key invariant: for instance, there is no test that attempts to mint more FTs than uploaded spectrum assets, and no on-chain log is shown that confirms the NFT counts in Tables II–IV correspond to the actual transfer events. The description also calls Ganache an 'Ethereum test net,' although Ganache is a local personal blockchain. The demo therefore provides only UI-level evidence, not validation of the security or correctness of the contract logic.

minor comments (7)

[III.A, Figure 3.1] The paragraph introducing Figure 3.1 is duplicated verbatim immediately before and after the figure; one copy should be removed.
[III.A, Figure 3.1] The parameter name amount_eth and the note 'the unit of FT is wei' are confusing: state explicitly whether the minting quantity is a number of whole FTs, an ETH quantity, or a wei quantity, and define the FT/ETH conversion if any.
[III.B] The statement that 'the number of uploaded spectrum assets must be equal to the number of FTs minted' is inconsistent with the later claim that FT count must not exceed spectrum assets; clarify whether the relation is equality or an upper bound.
[IV, Table I] The text says 'we choose one PU and two SUs,' but Table I lists one PU and four SUs; explain the roles of SU3 and SU4 in the experiment.
[IV, Figure 4.1] The phrase 'The transfer "_amount" is equal to 10 eths' should read '10 FTs' or '10 ETH' once the FT unit is defined.
[References] Reference [8] is incomplete: "Spect-NFT: Non-Fungible Tokens for Dynamic Spectrum Management" lacks publication venue and year; also verify the date for reference [10], which is described in the text as November 2022 but has a 2024 access date.
[Section III.B] The function updateChannelInfo has no access-control restriction; the paper should state who is allowed to upload spectrum metadata and how the spectrum management department's authorization is recorded on-chain.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the proposal is an implementation design whose claims rest on external token standards and demo results, not on re-importing its own outputs.

full rationale

The paper does not derive a quantitative result from fitted parameters or predict a quantity that is then backed out. Its load-bearing claims are (i) that ERC404-style tokenization can represent spectrum assets as FTs backed by uploaded channel metadata, and (ii) that ERC4907-style NFST leasing lets SUs rent those assets with FTs. These claims are presented as a smart-contract design and demonstrated on a Ganache/Remix testnet, not as a consequence of a self-citation chain. The only direct self-citation, [15], is used for 'The method for minting NFST can refer to literature [15]'; this is an implementation convenience, and NFST minting is not the central derivation. The paper's assertion that 'The ERC404 standard ensures that the number of FTs does not exceed the number of spectrum resources' is an appeal to an external experimental standard and, if anything, is a correctness/validation gap because the shown pseudo-code does not enforce that invariant; it is not circularity. No equation in the paper is constructed to equal the result it purports to establish, and no fitted input is renamed as a prediction. Therefore the appropriate finding is no significant circularity.

Assumptions & free parameters 1 free parameters · 4 assumptions · 2 invented entities

The system rests on the regulatory assumption that a spectrum department authorizes PUs, on the untested behavior of the unofficial ERC404 standard (asserted to keep FT count below spectrum-asset count), and on the authors' prior ERC4907 minting method. The mapping of whole FTs to NFTs is a hand-chosen convention. No free parameters are fitted to data.

free parameters (1)

Whole-FT to spectrum-asset conversion rate = 1 (implicit)
The paper assumes each whole FT (1 ETH worth) corresponds to exactly one spectrum asset and one NFT, enabling the claimed invariant. This rate is chosen by hand and is not justified or enforced by the pseudo-code.

assumptions (4)

domain assumption The spectrum management department authorizes PUs to utilize specific spectrum resources before tokenization.
Stated in Section II (component a) and Section III.A; the entire scheme assumes a regulatory authority that grants usage rights.
ad hoc to paper The ERC404 standard, as deployed, maintains a 1:1 mapping between whole FT units and NFTs, and ensures FTs never exceed spectrum assets.
Asserted in Section III.A ('The ERC404 standard ensures...'), but the provided pseudo-code does not implement or verify this invariant; it is an unstated modeling assumption.
domain assumption The ERC4907 standard can be used to mint a rentable NFST that tracks owner, user, and expiry, following the method of the authors' prior work [15].
Invoked in Section III.D with a reference to [15]; no code or formal specification is given.
domain assumption Blockchain transaction finality and transparency are sufficient for the spectrum-occupancy conflict prevention described in Section II step 6.
The paper assumes that querying NFST status is reliable and that all parties read the same ledger; no latency or fork issues are considered.

invented entities (2)

NFST (Non-Fungible Spectrum Token)
purpose: Represents temporary usage rights to a spectrum resource, separating owner and user roles via ERC4907.
Introduced in Section II and III.D; no falsifiable prediction or external validation is provided; it is a token type defined by the paper.
Spectrum-backed Fungible Token (FT)
purpose: Fungible token minted against spectrum assets, used as both a value representation and payment for rentals.
It is an application of ERC20/ERC404; the paper does not provide independent evidence that such tokens would be accepted as payment or legal claim.

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Cite this review

Pith. "Pith review of Leveraging NFTs for Spectrum Securitization in 6G Networks." pith.science (2026). https://pith.science/paper/SPS6YHEV

@misc{pith2026241112347,
  author       = {Pith},
  title        = {Pith review of: Leveraging NFTs for Spectrum Securitization in 6G Networks},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/SPS6YHEV}},
  note         = {Machine review of arXiv:2411.12347}
}

read the original abstract

Dynamic Spectrum Sharing can enhance spectrum resource utilization by promoting the dynamic distribution of spectrum resources. However, to effectively implement dynamic spectrum resource allocation, certain mechanisms are needed to incentivize primary users to proactively share their spectrum resources. This paper, based on the ERC404 standard and integrating Non-Fungible Token and Fungible Token technologies, proposes a spectrum securitization model to incentivize spectrum resource sharing and implements it on the Ethereum test net.

Figures

Figures reproduced from arXiv: 2411.12347 by the authors.

**Figure 3.** Spectrum [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

10 extracted references · 9 canonical work pages

[7]

Non - Fungible Token Enabled Spectrum Sharing for 6G Wireless Networks[C]//2023 IEEE Globecom Workshops (GC Wkshps)

Shao X, Cao P, Wang S, et al. Non - Fungible Token Enabled Spectrum Sharing for 6G Wireless Networks[C]//2023 IEEE Globecom Workshops (GC Wkshps). IEEE, 2023: 1075 -

work page 2023
[8]

Blockchain - empow ered secure spectrum sharing for 5G heterogeneous networks[J]

Zhou Z, Chen X, Zhang Y, et al. Blockchain - empow ered secure spectrum sharing for 5G heterogeneous networks[J]. IEEE Network, 2020, 34(1): 24 -

work page 2020
[15]

Dynamic Spectrum Sharing Based on the Rentable NFT Standard ERC4907[C]//2024 13th International Conference on Communications, Circuits and Systems (ICCCAS)

Ye L, Chen B, Shivanshu S , et al. Dynamic Spectrum Sharing Based on the Rentable NFT Standard ERC4907[C]//2024 13th International Conference on Communications, Circuits and Systems (ICCCAS). IEEE, 2024: 503 - 507

work page 2024
[2]

Spectrum management in the 6G era: The role of regulation and spectrum sharing[C]//2020 2nd 6G Wireless Summit (6G SUMMIT)

Matinmikko - Blue M, Yrjölä S, Ahokangas P. Spectrum management in the 6G era: The role of regulation and spectrum sharing[C]//2020 2nd 6G Wireless Summit (6G SUMMIT). IEEE, 2020: 1 -

work page 2020
[3]

Dynami c spectrum leasing: A new paradigm for spectrum sharing in cognitive radio networks[J]

Jayaweera S K, Vazquez - Vilar G, Mosquera C. Dynami c spectrum leasing: A new paradigm for spectrum sharing in cognitive radio networks[J]. IEEE transactions on vehicular technology, 2010, 59(5): 2328 -

work page 2010
[6]

Non - fungible token (NFT): Overview, evaluation, opportunities and challenges[J]

Wang Q, Li R, Wang Q, et al. Non - fungible token (NFT): Overview, evaluation, opportunities and challenges[J]. arXiv preprint arXiv:2105.07447,

arXiv
[9]

However, due to the indivisib le nature of NFTs, they can only be traded as whole units

Using NFT to realize spectrum securitization has good prospects . However, due to the indivisib le nature of NFTs, they can only be traded as whole units. This characteristic, coupled with potentially higher prices, may lead to reduced liquidity for spectrum resources represented as NFTs. In November 2022, MarFernandez

work page 2022
[10]

The entire f - NFT space explained

MarFernandez.eth. "The entire f - NFT space explained." Mirror, 5 Jun. 2024, https://mirror.xyz/marfernandez.eth/s4fgUVp34_1q3zTT64qfPjC m97cLpFTy5B60vbQ78Kg

work page 2024

Show all 10 references

[11]

The F - NFT scheme is not suitable for simultaneously fragmenting multiple NFTs

In spectrum securitiza tion, multiple NFTs will be used to represent different spectrum assets. The F - NFT scheme is not suitable for simultaneously fragmenting multiple NFTs. In February 2024, the Pandora team

2024
[12]

Fractional non ‐ fungible tokens: Overview, evaluation, marketplaces, and challenges[J]

Ch oi W, Woo J, Hong J W K. Fractional non ‐ fungible tokens: Overview, evaluation, marketplaces, and challenges[J]. International Journal of Network Management, 2024: e2260

2024

Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.

[1] [7]

Non - Fungible Token Enabled Spectrum Sharing for 6G Wireless Networks[C]//2023 IEEE Globecom Workshops (GC Wkshps)

Shao X, Cao P, Wang S, et al. Non - Fungible Token Enabled Spectrum Sharing for 6G Wireless Networks[C]//2023 IEEE Globecom Workshops (GC Wkshps). IEEE, 2023: 1075 -

work page 2023

[2] [8]

Blockchain - empow ered secure spectrum sharing for 5G heterogeneous networks[J]

Zhou Z, Chen X, Zhang Y, et al. Blockchain - empow ered secure spectrum sharing for 5G heterogeneous networks[J]. IEEE Network, 2020, 34(1): 24 -

work page 2020

[3] [15]

Dynamic Spectrum Sharing Based on the Rentable NFT Standard ERC4907[C]//2024 13th International Conference on Communications, Circuits and Systems (ICCCAS)

Ye L, Chen B, Shivanshu S , et al. Dynamic Spectrum Sharing Based on the Rentable NFT Standard ERC4907[C]//2024 13th International Conference on Communications, Circuits and Systems (ICCCAS). IEEE, 2024: 503 - 507

work page 2024

[4] [2]

Spectrum management in the 6G era: The role of regulation and spectrum sharing[C]//2020 2nd 6G Wireless Summit (6G SUMMIT)

Matinmikko - Blue M, Yrjölä S, Ahokangas P. Spectrum management in the 6G era: The role of regulation and spectrum sharing[C]//2020 2nd 6G Wireless Summit (6G SUMMIT). IEEE, 2020: 1 -

work page 2020

[5] [3]

Dynami c spectrum leasing: A new paradigm for spectrum sharing in cognitive radio networks[J]

Jayaweera S K, Vazquez - Vilar G, Mosquera C. Dynami c spectrum leasing: A new paradigm for spectrum sharing in cognitive radio networks[J]. IEEE transactions on vehicular technology, 2010, 59(5): 2328 -

work page 2010

[6] [6]

Non - fungible token (NFT): Overview, evaluation, opportunities and challenges[J]

Wang Q, Li R, Wang Q, et al. Non - fungible token (NFT): Overview, evaluation, opportunities and challenges[J]. arXiv preprint arXiv:2105.07447,

arXiv

[7] [9]

However, due to the indivisib le nature of NFTs, they can only be traded as whole units

Using NFT to realize spectrum securitization has good prospects . However, due to the indivisib le nature of NFTs, they can only be traded as whole units. This characteristic, coupled with potentially higher prices, may lead to reduced liquidity for spectrum resources represented as NFTs. In November 2022, MarFernandez

work page 2022

[8] [10]

The entire f - NFT space explained

MarFernandez.eth. "The entire f - NFT space explained." Mirror, 5 Jun. 2024, https://mirror.xyz/marfernandez.eth/s4fgUVp34_1q3zTT64qfPjC m97cLpFTy5B60vbQ78Kg

work page 2024