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What It Is

Scarcity is a Chaumian e-cash research prototype positioned as “electronic cash for the Internet.” It is not a blockchain, exchange, or DeFi project. It uses blind-signature bearer tokens, with an emphasis on privacy, unlinkability, and addressless transfers. Tokens are issued by trusted mints, and merchants choose which mints they are willing to accept.

Core Mechanism

The project centers on the Freebird mint, Witness notary, and Hypertoken network. VOPRF allows a mint to issue authorizations without knowing the underlying content; Schnorr/DLEQ is used for ownership proofs; nullifier gossip quickly propagates spend markers, and any repeated marker is treated as a double-spend. 3-of-5 BLS12-381 witness threshold signatures provide ordering and evidence for disputes, with optional anchoring to Ethereum for auditability. It also supports splitting, merging, HTLCs, cross-federation bridges, multi-party atomic transfers, and Tor .onion.

Pricing and Fees

The documentation explicitly states “No fees — zero-cost transfers,” meaning transfers are free at the protocol layer. The code can be self-hosted via GitHub, Docker, npm, and CLI to run a mint, web wallet, and explorer. However, it does not disclose hosted-service pricing, Ethereum anchoring costs, mint operating costs, or any commercial pricing model.

Pros and Cons

Its strengths are a clearly defined privacy architecture, no reliance on a global ledger or mining, an experimentally valuable double-spend detection design, and a clear open-source self-hosting path. The drawbacks are equally notable: it is explicitly not production-ready and requires security audits; supply, backing, and access policies are determined by each mint, with no protocol-enforced cap; and it does not disclose KYC requirements, licensing, fiat on/off-ramps, cold-wallet arrangements, or insurance. The lazy demurrage mechanism, with an effective lifespan of about 1.5 years, may encourage circulation but makes it unsuitable for long-term value storage.

Who It’s For and Access from China

Scarcity is best suited to cryptography researchers, privacy-payment developers, and experimental teams that can bear their own technical risk. It is not suitable for ordinary investors or trading users. The documentation does not specify access from China, network reachability, or payment channels, so these should be treated as unknown. If you need more mature and usable alternatives, you can compare Cashu, Fedimint, Lightning, Monero, or Zcash, though compliance and usability still need to be assessed separately.