In @MidnightNetwork all designs of
most people's understanding of it stops at "used to pay transaction fees" and then they skip over it. But if you are willing to take the time to break down every design detail of DUST, you will find that it is not a simple "Gas substitute" but a meticulously derived network resource mechanics system—every attribute is intentional, and every constraint addresses a real existing problem.
The white paper uses a very apt analogy to describe this system: $NIGHT is the wind turbine, DUST is the electricity it charges into the battery pack, and the on-chain operations on Midnight are the power-consuming devices. The generator can charge any battery, it stops when the battery is full, and continues charging only when used; the electricity in the battery is used to drive the devices but cannot be transferred to other batteries—it can only be consumed.
This metaphor almost completely captures the essence of DUST design. But the devil is in the details, so let's peel back the layers and take a look.
First layer: Why DUST must decay.
DUST has a property that confuses many people: it decays.
When you transfer NIGHT tokens to others, or actively disconnect the 'designated relationship' between NIGHT and DUST addresses, the DUST that has accumulated in that original DUST address will begin to gradually diminish at a linear rate until it completely disappears.
This is not a bug; it is a clever solution to the 'double-spend attack'.
Imagine a scenario without a decay mechanism: an attacker holding a large amount of NIGHT can quickly direct DUST generation to multiple addresses in a short time, attempting to accumulate a DUST supply far beyond normal levels, and then launch a torrent of transactions to congest the network. The decay mechanism fundamentally blocks this path—no matter how many addresses you designate for generation, the total amount of DUST that can be produced per unit of NIGHT is constrained by the DUST cap, which is strictly linked to the amount of NIGHT held. DUST balances in disconnected addresses continuously drain away; you cannot 'stockpile', nor can you bypass the cap by changing addresses.
Essentially, DUST is a flow resource rather than a stock resource. You can only use the current output and cannot accumulate historical inventory.
Second layer: non-transferable—what seems like a restriction is, in fact, a shield.
Another counterintuitive property of DUST is its non-transferability. It cannot circulate between addresses, making it impossible to buy or sell, to place orders on exchanges, or to become a speculative object.
At first glance, this seems like a limitation. However, from a design logic perspective, this constraint solves three problems at once:
Firstly, insulating supply shocks. If DUST were tradable, its price would fluctuate with market sentiment. When the price of NIGHT skyrockets, DUST's market price could also soar, leading to severe fluctuations in on-chain operational costs. Non-transferability completely isolates DUST's 'value' from market speculation, linking on-chain fees only to the actual network usage situation, not to market sentiment.
Secondly, to avoid regulatory gray areas. Transferable privacy assets have always been a thorn in the side of regulators—privacy coins like Monero and Zcash have long faced delisting pressures from exchanges, rooted in the fact that they are both privacy tools and freely circulating stores of value, making it difficult to sever ties with money laundering. The non-transferability of DUST eliminates this possibility at the design level: it has no secondary market, cannot serve as a store of value, and is logically closer to 'network usage quotas' than 'currency'. The white paper directly addresses this: this property 'responds to regulatory issues related to shielded assets that can serve as stores of value'.
Thirdly, to strengthen MEV resistance. MEV (Max Extractable Value) attacks are fundamentally based on attackers being able to observe on-chain transactions to identify potential arbitrage or liquidation opportunities, and then front-run those transactions. DUST is a shielded asset, transaction details are not exposed externally, and attackers cannot identify targets, effectively clearing the soil for MEV attacks from the source.
Third layer: The asymmetric cost of ZK proofs—making attacks much more expensive than defenses.
Here is a technical detail that is the most intriguing part of the entire DUST anti-attack design.
When users execute transactions involving DUST consumption on Midnight, they need to generate a zero-knowledge proof (ZK Proof) to cryptographically prove 'I indeed have enough DUST to complete this transaction' without revealing the exact balance numbers.
Generating ZK proofs requires considerable computational resources from the user's device; however, verifying ZK proofs involves much less computational overhead. This creates a naturally asymmetric cost structure:
For ordinary users, generating a ZK proof for each transaction is an acceptable cost. However, for attackers attempting to clog the network with large volumes of spam transactions, each attack transaction requires their own computing device to generate a complete ZK proof, with costs linearly amplifying with the scale of the attack, ultimately becoming not worth the effort.
More ingeniously, when network congestion leads to rising DUST fees, those transactions that do not carry enough DUST will be rejected, forcing the attacker to regenerate transactions—each regeneration requires recalculating a ZK proof. This means that attacks not only consume DUST reserves but also deplete the attacker's computational time and hardware resources. Rational attackers will give up at some critical point, while irrational attackers will gradually exhaust their DUST reserves, naturally ending the attack.
The white paper refers to this design as 'self-imposed asymmetric costs', and this description is quite accurate— the more aggressive the attack, the greater the cost borne by the attacker.
Fourth layer: Dynamic fees and a 50% block utilization target.
Once you understand the basic mechanics of DUST, it becomes easier to grasp Midnight's dynamic pricing mechanism.
Each transaction's DUST fee consists of three parts: fixed minimum fee (anti-DDoS baseline) + congestion fee (dynamic variable) × transaction weight (measured by bytes and computational load).
Congestion fees are the core variable, automatically adjusting based on the current block utilization: when block usage exceeds the target value, fees increase; when below the target value, fees decrease.
Midnight sets this target value at a 50% block utilization rate rather than maximizing it at 100%. There is clear engineering logic behind this choice:
A target of 100% means that the network operates at full capacity for a long time, and any peak demand will immediately lead to congestion, soaring fees, and transaction delays—history has proven the cost of this path with the severe fluctuations in Ethereum gas fees. A target of 50% means that the network reserves half of its elastic buffer space, with low and stable operational rates, allowing sudden peak demands to be elastically absorbed without immediately pushing fees to an unbearable level for users.
This is a proactive concession of engineering stability by an economic system design: it gives up the nominal 'maximum throughput' in exchange for a more stable user experience in actual use. For those treating Midnight as a production environment, this predictability is far more important than theoretical peak throughput.
Fifth layer: Three types of DUST users—from Web3 natives to completely unaware end-users.
DUST beneficiaries are divided into three tiers, covering everyone from experienced users to ordinary people who know nothing about blockchain:
NIGHT holders: The most direct usage path, holding NIGHT automatically generates DUST for their own on-chain operations. This is the most typical Web3 user path.
DUST recipients: They do not hold NIGHT themselves, but receive DUST generated by others' NIGHT designations and can use it directly for operations. This allows non-profit organizations, small developers, or projects that rely on sponsorship to operate in Midnight without needing to hold NIGHT.
DUST sponsors: They neither hold NIGHT nor directly interact with DUST. The DApps they use have their DUST paid by the operators, and the entire process is completely transparent to users—they don’t even need to know that a blockchain exists. This effectively brings the Web2 application experience into Web3.
These three levels combined mean that the potential user base for Midnight is not limited to 'crypto users who can manage wallets', but includes anyone who can use internet applications.
Putting all of this together.
From mitigating double-spend attacks, non-transferable insulated speculation, and ZK proof generating asymmetric attack costs, to constructing a self-stabilizing system with dynamic fees and a 50% utilization target, and a three-tier user architecture covering everything from professionals to complete novices—every design decision in DUST is not isolated; they collectively serve a single goal:
To build a truly usable, privacy-controllable on-chain operational base layer for the real world.
$NIGHT As the core holding certificate of this system, its value comes not only from the token itself but also from the intricate mechanism it supports. Holding NIGHT essentially grants permanent usage rights to the capacity of the Midnight network—one of the few systems that have been seriously designed from an engineering perspective to find a balance between privacy and compliance.
This level of seriousness is itself a scarce asset in the current crypto market.