Every important event your business produces — anchored permanently.
The Event Ledger is an append-only, cryptographically signed record of anything that matters to your business. Payments, approvals, deliveries, user actions, system changes — once anchored, a record cannot be edited, deleted, or disputed. One API call. Permanent proof.
Free up to 1,000 events/month · Paid plans from $149/month · No setup fees
What the Event Ledger does
Send any business event to Invoance with a single API call. We hash it, sign it with Ed25519, timestamp it, and write it to an append-only ledger. The result is a permanent, tamper-evident record that anyone can verify — without trusting you, us, or anyone else.
Events can only be added — never updated or deleted. This is enforced at the database level, not by policy. No admin override exists.
Every event is signed with Ed25519 using a key bound to your organization. The signature proves the record came from you and hasn't changed.
SHA-256 is applied to the event payload before signing. Any alteration — even a single character — produces a completely different hash.
The timestamp is recorded the moment Invoance receives the event and is part of the signed payload. It cannot be backdated or adjusted.
Every anchored event gets a public verification URL. Anyone — a customer, partner, auditor, or regulator — can verify the record without an account.
What businesses anchor
Any event your business produces can be anchored. These are real categories of events that companies send to the Event Ledger — from two-person startups to enterprise operations.
Payment approved, invoice sent, refund issued, subscription renewed, payout completed
Order placed, shipment dispatched, delivery confirmed, return initiated, inventory adjusted
Account created, permission changed, data exported, consent given, terms accepted
Config updated, deployment pushed, feature flag toggled, API key rotated, schema migrated
Contract signed, amendment filed, SLA milestone hit, renewal triggered, NDA executed
Expense approved, loan decision made, claim adjudicated, review submitted, budget allocated
Why regular logs aren't enough
Your application logs are built for debugging — not for proving something happened. When a customer disputes a charge, a partner questions a delivery, or anyone asks "did this really happen?" — logs don't hold up. They can be edited. They have no proof of origin. They depend on whoever controls the database.
The Event Ledger doesn't replace your logs. It runs alongside them as a proof layer — anchoring the events that matter most.
Built for every size of business
Whether you're a solo founder shipping your first product or an enterprise managing thousands of daily transactions — if something important happens in your business, it should be provable.
Anchor payments, contracts, and customer agreements. When a dispute arises, you have cryptographic proof — not a screenshot.
Prove deliverables were submitted on time. Anchor approvals, revisions, and handoffs so scope disputes have a clear record.
Record user actions, billing events, and system changes. Give customers verifiable proof that their data was handled correctly.
Anchor shipment confirmations, quality inspections, and chain-of-custody handoffs across your supply chain.
Create tamper-evident records of patient consent, treatment decisions, and data access — built for HIPAA and beyond.
Anchor certifications, grades, and credential issuance. Recipients can independently verify their records forever.
When proof matters
You don't think about proof until someone asks for it. These are the moments where an immutable record changes the outcome.
A customer claims they never approved a payment or didn't receive a service.
A supplier or logistics partner says the handoff never happened.
A regulator, investor, or auditor asks for proof that records haven't been tampered with.
You need to know exactly what happened, when, and prove nothing was altered.
One API call. Permanent proof.
The Event Ledger runs alongside your existing systems. You don't reroute logs or change workflows. You POST the events you want anchored. Everything else continues unchanged.
POST any business event to the ledger. Include whatever payload matters — we'll hash and sign it.
POST /v1/events
{
"event_type": "order.shipped",
"payload": {
"order_id": "ord_8f2a",
"carrier": "fedex",
"tracking": "7489201837465",
"shipped_by": "warehouse_east"
}
}Invoance hashes the payload, signs it with Ed25519, and returns the event ID and ingestion timestamp.
{
"event_id": "9549c332-a52b-…",
"ingested_at": "2026-03-12T09:14:22Z"
}GET the event to see hashes, signatures, and full cryptographic proof.
GET /v1/events/9549c332-a52b-…
→ payload_hash: "a3f2b1c9d4…"
→ request_hash: "c7d4e9a1b2…"
→ event_hash: "f8a1c3d2e5…"
→ ingested_at: 2026-03-12Technical guarantees
These aren't marketing claims. They're structural properties of how the Event Ledger works. They hold regardless of who you are, what plan you're on, or how you use the API.
SHA-256 binds the proof to the exact content submitted. Any change to the payload invalidates the hash.
Ed25519 proves the record was signed by your organization's key. It cannot be forged without access to the private key.
Recorded at ingestion. Part of the signed payload. Cannot be backdated, adjusted, or overwritten.
Events can only be added. The database enforces this structurally — no admin, no API, no override can delete or modify a record.
Every event gets a verification URL that works without authentication. The proof resolves against cryptography, not a server assertion.
Verification can be performed offline using the public key and Ed25519 signature. You don't need to trust Invoance.
Start free. Scale when you need to.
Build your integration. Test the API. Anchor real events. No credit card required.
For growing teams with production event volume, document anchoring, and AI attestations.
Multi-user team management, 7-year retention, and audit obligations for mid-market teams.
For regulated financial institutions with multi-user teams, dedicated onboarding, and priority support.
Unlimited team seats, dedicated onboarding, SSO/SAML, custom retention, BAA, and priority rate limits.
All plans include public verification, Ed25519 signing, and API access. Annual billing saves 20%. See full pricing
Make your business events provable
If something important happens in your business, it should be anchored — permanently, cryptographically, independently verifiably. Start with one event. Scale from there.
Event Ledger — Tamper-Proof Business Records
Every important event your business produces — anchored permanently. The Event Ledger is an append-only, cryptographically signed record of anything that matters to your business. Payments, approvals, deliveries, user actions, system changes — once anchored, a record cannot be edited, deleted, or disputed. One API call. Permanent proof.