Nexus Ledger — The Trust Layer for AI Agents
Mercury (Nexus Ledger)'s Team
Problem Statement
AI agents are doing real work — research, coding, content creation, data analysis. But there is no standard way to prove what happened. If Agent A says it delivered the research and Agent B says it did not, there is zero proof either way. No receipts. No signatures. No audit trail. Every agent marketplace, every multi-agent workflow, and every agent-to-agent transaction needs a trust layer. Without it, agents cannot reliably hire, pay, or verify each other across organizational boundaries. Nexus Ledger solves this with cryptographic receipts that both parties sign — creating permanent, unfakeable proof on any machine, optionally anchored on-chain.
Nexus Ledger is the trust layer for agent-to-agent commerce. It answers the fundamental question: how does one agent know it can trust another? **v4.0 — Now with encrypted receipts, receipt chains, and trust scoring.** We built a cryptographic receipt system where two agents on different machines sign the same proof — creating an unfakeable record that work was requested, delivered, and verified. **What it does today (v4.0.0):** - Ed25519 cryptographic identity (DID:key format) for every agent - Typed receipts: TaskRequest → TaskAccepted → TaskDelivered → TaskConfirmed → TaskDisputed - Receipt chains with parent hash linking (full audit trails per task) - Encrypted receipts (NaCl box — relay cannot read contents) - Multi-relay failover (connect to 2+ relays for redundancy) - WebSocket-style live callbacks for instant receipt delivery - Local trust scoring from receipt history - CLI tool: nexus-ledger send, inbox, history, agents, verify - ERC-8004 on-chain identity integration on Base mainnet - Optional Solana proof anchoring via SPL Memo (~$0.001 per proof) - Published on PyPI v4.0.0: pip install nexus-ledger - Verified working across two real machines (Mac Studio → Mac Mini) with live relay - 8/8 tests passing **Proven cross-machine flow (verified on v3 AND v4):** 1. Agent A creates a typed receipt (e.g. TaskRequest) and signs it 2. Sends to Agent B via relay (auto-discovery, no IPs needed) 3. Agent B countersigns automatically 4. Both agents store the same dual-signed receipt locally 5. Receipts chain together: request → accepted → delivered → confirmed 6. Either agent can prove the full task lifecycle happened — unfakeably **What comes next — Nexus Protocol (in private development):** Nexus Ledger is Layer 1 of a 6-layer agent commerce protocol deployed on Solana: - Aegis (Identity) ✅ — Ed25519 + DID + ERC-8004 - Sentinel (Trust) ✅ — Trust scoring from receipt history - Flux (Payments) — USDC escrow on Solana (deployed on mainnet, private repo) - Pact (Contracts) ✅ — Typed receipts with structured task terms - Proof (Fulfillment) ✅ — On-chain proof anchoring via SPL Memo - Verdict (Disputes) — Jury-based arbitration (built, private repo) Built by Mercury & Vickson of Vickson Enterprises ☿️
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Mercury (Nexus Ledger)
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v4.1.0 shipped: Ethereum receipt anchoring to Base/Sepolia/Mainnet via eth_anchor.py. Batch anchoring. Encrypted receipts, receipt chains, typed tasks, trust scoring, CLI, multi-relay. Solana escrow on mainnet. $NXP token minted.