What is Lerian SILOC?

Lerian SILOC is your participant connectivity to BACEN’s SILOC deferred net settlement via Nuclea — gateway link, card-domain relay to SLC, and certificates.

Lerian SILOC is a financial institution’s participant-side connectivity to SILOC. SILOC is the deferred multilateral net settlement system of the Central Bank of Brazil (BACEN). The clearinghouse Nuclea operates it. SILOC nets many interbank credit-order transactions. It settles only the resulting net position on Nuclea’s settlement account at the STR, BACEN’s Reserve Transfer System. Two products settle through SILOC: boleto (Cobrança) and cards.

Lerian SILOC gives an institution one direct path to SILOC. It owns the single messaging-gateway connection to Nuclea over the national financial-system network. It relays the card-domain settlement traffic to Lerian SLC, Lerian’s card-settlement service. It also keeps the participant directory, the regulated certificate references, and a settlement-coverage view.

What Lerian SILOC does — and does not — do

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Lerian SILOC carries messages and administers the participant’s connection. It holds no position and executes no transfer.

• SILOC and Nuclea perform the netting and the final settlement of the net position, not Lerian SILOC.
• The separate STR rail, Lerian SPB, executes the STR deposit leg — the monetary settlement at BACEN — not SILOC.
• Lerian SILOC computes no net position and performs no monetary arithmetic. It carries messages and records settlement facts.

The service is single-institution: it connects one financial institution to SILOC, with no multi-tenancy.

Who it serves

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Lerian SILOC serves financial institutions that are direct or indirect SILOC participants under their own ISPB. The service opens and maintains their gateway connection to Nuclea. It relays the card-domain settlement family to Lerian SLC. It keeps a directory of the participants it settles for. It holds the regulated certificate references the connection requires.

Glossary

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Term	Meaning
Lerian SILOC	A financial institution’s native, participant-side connectivity to SILOC — gateway connection, card-domain relay, and administration.
SILOC — Sistema de Liquidação Diferida das Transferências Interbancárias de Ordens de Crédito	BACEN’s deferred multilateral net settlement system, operated by Nuclea.
Nuclea	The clearinghouse that operates SILOC and settles its net position at the STR/BACEN.
LDL — Liquidação Diferida Líquida	Deferred multilateral net settlement, SILOC’s settlement model.
Deferred net settlement	Settling only the net position of many transactions at fixed daily cycle times, rather than each transaction individually.
STR — Sistema de Transferência de Reservas	BACEN’s Reserve Transfer System, where SILOC’s net position is finally settled; the deposit leg is executed by the separate STR rail.
Participant	An institution in SILOC, classified as direct, indirect, or settling institution.
ISPB	BACEN’s 8-digit participant identifier.
NUOp — Número Único da Operação	BACEN’s globally unique per-operation identifier, used as the deduplication key.
Boleto (Cobrança) and Cards	The two products that settle through SILOC; card settlement is handled by the sibling Lerian SLC service.

For how Lerian SILOC sits alongside the other native rails and the partner interfaces, see Native messaging and partner interfaces.