Skip to main content
In plain English: The Transfer Settlement Network (TSN) is settlement and authorization coordination infrastructure built by TrustLink Labs. It moves stablecoins on Solana without publishing a payment ID, sender, or recipient TIN on-chain. Funding goes into an epoch treasury. Settlement runs through an opaque, keyed slot authorized by a Mother-rooted DNA permit. There is no per-payment PDA. TSN is currently live on Solana Devnet.

​
The four layers

TSN is not one program. It is four cooperating layers, each with a strict boundary. The layers are separated on purpose. A GPRU signature alone cannot move custody. A cranker cannot rewrite an authorization. TCAP owns the tip and sequence, not payment intent. TIN never holds a key.

​
What is deployed today

  • Solana Devnet. All four programs (TSN, TCAP, TIN Registrar, Stable TCAP Faucet) are live.
  • Privacy-safe credit path. The TCAP credit instruction uses opaque commitments, sequence checks, and nullifiers. There is no per-transfer PDA and no receipt joining funding to credit.
  • Debit and exit. Proof-gated and disabled. Live confidential debit and exit return ProofSystemNotEnabled until an audited proof verifier and the surrounding invariants are enabled.

​
Protocol layers

Each layer has its own page detailing every operation and its status.

TSN

Settlement coordination, epoch treasury, Mother-rooted DNA permits.

TIN

10-digit payment identity and route discovery.

GPRU

Non-custodial authorization and routing.

TCAP

Confidential balances: credit (live), debit and exit (in development).

​
Where to go next

How It Works

What the user sees versus what happens under the hood.

Current Architecture

The canonical TIN → GPRU → TSN → TCAP model with the end-to-end sequence diagram.

FAQ

Answers about privacy boundaries, deployment status, and the debit gate.

Run a Cranker

Operator process that leases work and pays Solana fees.
TrustLink Labs is the team building TSN. Everything on this site describes the Transfer Settlement Network protocol itself, not any hosted product.

GitHub Organization

All open-source repositories from TrustLink Labs.

Follow on X

Protocol announcements and Devnet updates.

Blog

Engineering notes and protocol write-ups.

Protocol Source

TSN, TCAP, TIN Registrar, and Faucet program source.

Docs Source

This documentation site.