FIRO Coin and Its Lelantus Spark Privacy Protocol

FIRO Coin and Its Lelantus Spark Privacy Protocol


Final yr, in August 2021, Firo – a privateness cryptocurrency protocol, previously referred to as Zcoin, unveiled the main points of its new privateness protocol.

Referred to as Lelantus Spark, it’s the protocol’s subsequent main replace that intends to enormously enhance the privateness, in addition to the general flexibility of its transactions. With this in thoughts, let’s dive a bit deeper into it.

What’s Lelantus Spark?

Spark represents the logical extension of the group’s work on Lelantus v1/v2, and it additionally retains many necessary options which embody however will not be restricted to:

  • Excessive anonymity units
  • Simple building
  • Environment friendly help for batch verification
  • No trusted setup
  • It additionally depends on well-established cryptographic assumptions

Moreover, the protocol introduces new privacy-preserving capabilities, together with:

  • Environment friendly multi-sig operations
  • Incoming and full view keys,
  • Spark addresses
  • Modular design

Firo’s group continues to discover new avenues to broaden the protocol’s performance, equivalent to enhanced addressing, in addition to the flexibility to point out proof of cost to numerous retailers.

Talking on the matter, Reuben Yap, Challenge Steward of Firo, stated:

“There are solely a handful of cryptocurrency privateness protocols in significant use at the moment, every with completely different trade-offs. […] Firo has at all times been on the forefront of privateness tech improvement and we imagine Lelantus Spark represents a holistic stability of excessive anonymity, simplicity, and suppleness whereas remaining true to the spirit of trustlessness in cryptocurrencies.”

Lelantus Spark’s key concepts have additionally been utilized in Monero’s upcoming privateness framework Seraphis in an effort to scale its ring sizes.

It’s value noting that Monero has had its fair proportion of challenges by means of the years. Firo’s implementation of Spark focuses on a lot greater anonymity units and makes use of sliding home windows between massive units, avoiding lots of the problems with decoy choice current in ring-based privateness. Firo’s core group has published an in depth article evaluating Spark with different privateness protocols.

Breaking Down the Options

Spark Addresses

The Lelantus Spark protocol brings ahead a non-interactive addressing system that’s designed to extend the privateness of the recipient of the transaction. The funds saved in these Spark addresses are additionally saved hidden, disallowing anybody from realizing the person’s precise holdings.

Beforehand, publicly-shared addresses might be searched on a block explorer straight, and anybody might test when stated addresses obtained a cost. Even with the quantities being hidden, the cost info itself was leaked. With Spark addresses, customers are allowed to share their addresses with out them being searchable on the blockchain.


Multi-sig operations will allow a number of mutually non-trusting events to generate, obtain, and likewise authorize, in a cooperative method, transactions related to an tackle that helps the multi-sig.

The Spark protocol is designed to help environment friendly signing and multi-sig operations because it makes use of the modified Chaum-Pedersen discrete logarithm proof.

Modular Design

The modular design launched by Spark follows well-known cryptographic constructing blocks such because the Pedersen commitments, zero-knowledge one-of-many proofs, vary proofs, in addition to discrete logarithm equality proofs which might be designed to permit simple safety evaluation without having any trusted setup processes.

View Keys

This function comes with just a few sensible purposes for organizations, charities, and people, that embody:

  • Benefactors are in a position to view balances and transaction values
  • Offloaded scan providers are allowed on on-line and cellular wallets
  • The balances will be decided for each auditing and accounting functions

In abstract, the Lelantus Spark protocol is completely different than among the hottest ones used in the meanwhile. As an illustration, the Ring-CT-based protocol that’s utilized in Monero (XMR) limits the sender anonymity due to the house and time scaling of the underlying signature scheme. Triptych, however, has a really cumbersome and sophisticated multi-sig course of, whereas zkSNARKs requires advanced math and a trusted setup.


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