What is Lerian SLC?

Lerian SLC is the client-owned software layer that operates the Serviço de Liquidação Centralizada (SLC) for a participant. The SLC is Núclea’s centralized card-settlement messaging service. Lerian SLC runs inside the institution’s own regulated environment. It signs with the institution’s own ICP-Brasil certificate. It exchanges the SLC messages and the official ASLC files with Núclea (ISPB 29011780). It submits over REST and receives Núclea’s inbound messages over the RSFN, Brazil’s National Financial System Network. Lerian SLC submits the settlement operations, builds and signs the ASLC files, and correlates Núclea’s returns. Each installation serves one client institution. Lerian SLC is API- and event-first.

What Lerian SLC does and does not do

Lerian SLC does not post to a ledger and does not require Midaz. It integrates with Lerian SILOC for settlement announcements and command outcomes.
Signing goes through a custody backend. Lerian SLC builds the unsigned payload and delegates signing to a software key, a PKCS#11 HSM, or AWS KMS. In SaaS, Lerian SLC never receives the signing private key in cleartext.

Who it serves

Lerian SLC works with the roles of the Brazilian card arrangement. It submits to Núclea as a credenciadora or a subcredenciadora, and it serves the clearing and funding of the IF Liquidante. The IF Domicílio and the bandeira are counterparties in its participant catalog.

Role	What it is
Credenciadora (acquirer)	Captures card transactions from merchants and submits their settlement operations.
Subcredenciadora (sub-acquirer)	A participant that enables receiving merchants to accept payment instruments but does not act as creditor toward the issuer in settlement.
IF Domicílio	The domicile financial institution that receives settlement notices and credits the merchant.
IF Liquidante	The settling financial institution that funds the clearing position for a settlement cycle.
Bandeira	The card scheme of the arrangement.

Glossary

Term	Meaning
Lerian SLC	Lerian’s client-owned software for operating Núclea’s centralized card-settlement (SLC) messaging.
SLC (Serviço de Liquidação Centralizada)	Núclea’s centralized settlement service for the Brazilian card arrangement.
ASLC	The official Núclea XML message layout family used by the SLC (UTF-16BE, XSD-validated).
NUliquid	Núclea’s 21-position settlement identifier (an `AAAAMMDD` date prefix plus a sequence) that tracks the operation after Núclea accepts it.
ISPB	The BACEN participant identifier; Núclea’s SLC destination is 29011780.
RSFN	Brazil’s National Financial System Network, which carries SLC traffic.
ICP-Brasil	The Brazilian public-key infrastructure whose certificate signs SLC files.
SPB security envelope	The BACEN payment-system envelope (GZIP plus an RSA/SHA-256 signature and AES-256, with a 588-byte security header) that wraps each file.
Clearing cycle	The settlement period over which Lerian SLC tracks and reconciles the IF Liquidante’s positions.

For how Lerian SLC sits alongside the other native rails and the partner interfaces, see Native messaging and partner interfaces. The card-domain deferred-net settlement family reaches Lerian SLC relayed from Lerian SILOC, the participant-side SILOC connectivity.

​What Lerian SLC does and does not do

​Who it serves

​Glossary

What Lerian SLC does and does not do

Who it serves

Glossary