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Ecash can make payments more private, but privacy does not by itself give users control of the Bitcoin behind their tokens. Cashu relies on an issuing mint for redemption; Fedimint distributes Bitcoin custody among federation guardians, subject to a threshold trust model. Neither design is the same as holding all the signing authority yourself.
What ecash is—and how it differs from Bitcoin
Bitcoin is the underlying asset and network. Ecash is a form of digitally signed token that can represent a claim on Bitcoin held by a mint or federation. Instead of sending an on-chain Bitcoin transaction for every payment, a user transfers ecash notes and a recipient may later redeem them through the system that issued them.
Cashu and Fedimint both use blinded signatures in their ecash designs. In broad terms, blinding is intended to make it difficult for the issuer to connect the act of issuing a token with its later presentation for payment. That is a privacy property, not proof that the user controls the backing Bitcoin or can redeem a token whenever they choose.
Cashu and Fedimint: the custody difference
Cashu describes itself as an open Bitcoin ecash protocol implemented by mints and wallets. Fedimint is a framework in which a federation of guardians operates a mint and holds Bitcoin collectively. Their designs differ most in who controls redemption and how authority over the backing Bitcoin is distributed.
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| Question | Cashu | Fedimint |
|---|---|---|
| Basic structure | An open ecash protocol implemented by mints and wallets, according to Cashu’s protocol documentation. | A federation of guardians operating Bitcoin, ecash, and Lightning modules, according to Fedimint’s architecture documentation. |
| Who holds or controls the backing? | The user depends on the issuing mint to redeem its tokens. The reviewed Cashu materials do not establish decentralized custody. | Deposited Bitcoin is held in a threshold multisignature wallet controlled collectively by guardians. |
| Privacy mechanism | Cashu’s protocol documentation describes Chaumian blind signatures using Blind Diffie-Hellman Key Exchange (BDHKE), along with a spent-secret list. | Fedimint’s project documentation describes blindly signed ecash notes and claims of unlinkability. |
| Main trust and recovery issue | Redemption depends on the mint; the reviewed sources do not establish a common recovery guarantee across Cashu mints. | Recovery requires threshold key material and at least one guardian database, according to the operator guide. Users also rely on guardians not to collude. |
| Integration | Applications can implement the Cashu protocol specifications; that does not establish that every deployed mint or wallet is equally reliable. | Modules and an SDK support application integration, including Lightning routes. |
Is Cashu self-custodial?
Do not treat Cashu ecash as self-custodial simply because its signatures are blind or the protocol is open. A Cashu wallet holds tokens, but redeeming them still depends on the mint that issued them. If the mint is unavailable or refuses redemption, blind signatures alone do not give the holder a way to compel payment or recover the backing Bitcoin.
Cashu’s design aims to prevent the mint from linking a token’s issuance to its later spending. Cashu’s own protocol documentation calls it “an ecash protocol built for Bitcoin.” That statement describes the protocol; it is not an independent assurance about a particular mint’s solvency, availability, security, or operating practices.
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How Fedimint distributes custody
Fedimint’s documentation describes a federation as “a group of guardians running the Fedimint protocol together.” Its guardians coordinate using AlephBFT consensus. Bitcoin deposits are held in a threshold multisignature wallet, so moving funds requires the configured threshold of guardian signatures rather than one guardian acting alone.
The operator guide gives 3-of-4 and 5-of-7 as examples of majority thresholds; these are examples, not universal federation settings. Fedimint’s documentation says no single guardian—or minority of guardians—can unilaterally move federation Bitcoin. The practical implication is that custody is distributed among guardians, not transferred entirely to each user as individual self-custody.
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What if guardians collude or go offline?
Distribution changes the trust assumptions but does not eliminate them. Fedimint’s trust documentation says users trust guardians not to collude and warns that a majority could theoretically steal federation Bitcoin. A threshold also affects availability: the operator guide says consensus halts if a majority of guardians disconnect, until enough return.
That means a federation can reduce reliance on any one operator while introducing reliance on the group and its ability to remain available. Before depositing, a user should understand which federation operates the mint, its threshold, who the guardians are, and what recourse exists if the federation stops operating.
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How recovery works in Fedimint—and what it does not promise
Fedimint’s operator guide says recovery requires at least the threshold number of keys and at least one guardian database. Guardian backups are encrypted with a password. Recovery therefore depends on the availability of federation key material, a database, and the ability to use the encrypted backup; it should not be described as guaranteed just because the system is federated.
Users evaluating a federation should find out how its guardians back up and protect keys and databases, who can access recovery material, and what process is available if guardians disappear. Those details are part of the custody decision, not just technical administration.
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What operating a Fedimint node involves
Fedimint is software for operating a federation, not a consumer product that requires a particular hardware purchase. Its operator documentation lists a minimum of 1 GB memory, 10 GB disk, and 1 CPU core, with 2 GB memory and 2 cores recommended. The documentation does not state a publication year for these requirements, so operators should check the current guide before choosing hardware.
The project lists home servers, older laptops, and cloud VPS instances as possible platforms. A Raspberry Pi is one optional single-board-computer route, not a requirement or a verified best choice. Running a node also means taking on operational and security responsibilities; the published hardware figures are requirements from the project guide, not independent performance benchmarks.
Fedimint’s documentation estimates about one second of added payment latency in most real-world scenarios. This is a project-published estimate, not an independently measured figure across all federations or payment conditions. Its architecture also describes on-chain and Lightning deposits and withdrawals, with Lightning gateways and modules as part of the system.
What users should check before holding ecash
- Identify the issuer. Know which Cashu mint or Fedimint federation must redeem the tokens.
- Separate privacy from custody. Blind signatures may limit transaction linkability; they do not independently establish control over backing Bitcoin or guaranteed redemption.
- For a federation, understand the threshold. Ask how many guardians are needed to move funds, what happens if enough guardians go offline, and who operates them.
- Understand recovery before depositing. For Fedimint, the operator documentation requires threshold keys and at least one guardian database; learn how backups are protected and who can access them.
- Keep exposure proportionate to your trust. Ecash is a claim mediated by an issuer or federation, so it carries a different custody risk from Bitcoin for which you personally control the relevant keys.
Cashu’s specifications say applications that follow them can interoperate, but protocol compatibility does not establish equal reliability or trustworthiness among deployments. The project materials describe intended properties; they do not establish universal safety, an independent comparative security audit, or ecosystem-wide adoption levels.
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