What is QC Custody?
Quantum Chain Custody is a managed orchestration API that gives institutional integrators — banks, fintechs, asset managers — a Fireblocks-like operating model on top of the Quantum Chain quantum-safe blockchain. You bring the keys. We handle everything else: multi-tenant vault/wallet management, transaction lifecycle orchestration, policy enforcement, and webhook-driven event delivery — with a full audit trail.Secure Key Management
Your private keys never touch our servers. Sign transactions externally with
your quantum-safe key and submit signatures via API.
Post-Quantum Secure
Built on quantum-safe cryptography from day one — no migration needed when
quantum computers arrive.
Multi-Tenant
Isolated vaults, wallets, policies, and audit trails per tenant. One
platform serves your entire organization.
Webhook-Driven
Real-time event delivery with HMAC-SHA256 signed payloads, automatic
retries, and 8 event types covering the full transaction lifecycle.
How It Works
Create a Vault
Organize wallets into logical groups — one per customer, one per purpose, or
however your business needs it.
Register Wallets
Provide your on-chain address and quantum-safe public key. The custody
service holds addresses, never private keys.
Initiate Transfers
Create transactions via API. The service estimates gas, evaluates policies,
and produces a signing payload.
Sign Externally
Retrieve the Keccak256 signing hash, sign it with your private key in your
own secure environment, and submit the signature.
Quick Links
Quickstart
From dashboard signup to first API call in under 5 minutes.
API Reference
Interactive playground for every endpoint — try calls directly from the
docs.
External Signing
The critical integration guide: how to sign transactions with your
quantum-safe key.