// POST-QUANTUM CUSTODY INFRASTRUCTURE

Institutional custody control.
Without surrendering your keys.

Qustody is the non-custodial control plane for institutional digital assets on Quantum Chain. Govern wallets, approvals, transfers, and token operations. Sign with Qeys inside your environment.

Create free sandbox

No card required · Devnet sandbox

See how Qustody works

Qustody/ Operations

Qustody Demo

SYNTHETIC DEMO DATA · ACTIONS SIMULATED

// MONITOR / OVERVIEW

Operations Overview

QUANTUM-20803

1 transaction waiting for an EnQlave signatureApproved intent is ready for its exact Qey.

Review →

// PENDING APPROVALS2

// RECENT TRANSACTIONS5

// VAULTS2

// AUDIT STATEVERIFIED

// RECENT TRANSACTIONS •••

TRANSACTIONAMOUNTSTATUS

bb22cc33…3344553.0000 QPENDING AUTHORIZATION

3fa85f64…66afa61.5000 QPENDING SIGNATURE

8c1d2e3f…2d3e4f0.2500 QCOMPLETED

NETWORK QUANTUM-CHAIN-20803API QUSTODYSIGNER ENQLAVEENV DEMO

// POLICY CHECK

✓

Transfer policy passed2 of 2 approvals recorded

DESTINATION ALLOWLISTPASS

DAILY VELOCITYPASS

// ENQLAVE SIGN REQUEST

Custody TransactionQey matched · payload verified

0x89e4…b72c

SIGNED LOCALLY

0private keys
held by Qustody

Qeyspost-quantum
signatures

Policyenforced
before signing

Hash chainedaudit
trail

20803Quantum Chain
mainnet

// CONTROL WITHOUT CUSTODY

Qustody controls the operation.
Your institution controls the keys.

Authorization and cryptographic possession stay separate by design. Qustody assembles the intent, applies policy, records approvals, and tracks finality. The signature is produced outside Qustody.

01QUSTODY CONTROL PLANE

Govern the intent

Policy evaluation
Approval quorum
Compliance workflow
Audit evidence

NO PRIVATE KEY MATERIAL

APPROVED PAYLOAD→TRUST BOUNDARY←QEY SIGNATURE

02YOUR SIGNING ENVIRONMENT

Possess the keys

EnQlave desktop
Encrypted Qey store
Exact-payload review
Local signature

CUSTOMER CONTROLLED

SIGNED TRANSACTION→

03QUANTUM CHAIN

Settle and confirm

CHAIN_ID 20803
FINALITY TRACKED
RECEIPT RECORDED

// ONE TRANSACTION / END TO END

Watch control become settlement.

Select each stage to inspect what Qustody knows, what your team decides, and when the Qey enters the flow.

// TRANSACTION / REQUESTEDCREATED

TRANSACTIONtx_demo_7f3a85f6

AMOUNT1.5000 QUANTUM

NETWORKSANDBOX · 20803

01 / 06

The requested operation becomes an immutable intent.

Source wallet, destination, asset, amount, network, and idempotency key are recorded before policy runs.

// LIVE OPERATION EVIDENCE

INTENT HASH0x89e4…b72c

POLICY STATEQUEUED

SIGNING STATENOT REQUESTED

AUDIT HEAD · 0x1c92…090e

Want to run it yourself?Create free sandbox →

// THE OPERATING SURFACE

Built for the people who have to answer for every movement.

Product controls for treasury, security, compliance, and engineering. One state model from request to evidence.

POLICY & APPROVALS

Make authority explicit before a Qey is asked to sign.

Destination controls, velocity rules, role capabilities, and human quorum are evaluated against the exact transaction intent.

Policy outcomes remain attached to the transaction
Approval reasons are attributable and auditable
Signing begins only after authorization succeeds

// PENDING APPROVAL1 OF 2

Treasury transfer · 1.5000 QUANTUM

FROMOperations / PrimaryTO0x71c4…9f20

✓M. ChenTreasury operator · approved09:41 UTC

02Risk approverRequired capability: transactions:approve

POLICY EVALUATION4 / 4 PASSED

VAULTS & WALLET OPERATIONS

Know where assets sit, who can act, and which Qey controls the wallet.

Network-bound vaults, wallet identity, multi-asset tracking, balances, and signing readiness stay visible in one operational inventory.

Ownership-proved, signable wallet identities
Quantum Chain mainnet and sandbox context
Scoped resources and controls

// VAULT / TREASURY OPERATIONSACTIVE

AVAILABLE BALANCE248,520.0000QUANTUM

Primary settlement0x8d72…5a91 · qey:sha256:98a4…

READY

Token operations0x2bf1…8c04 · qey:sha256:c102…

READY

AUDIT, TOKENS & INTEGRATION

Follow the evidence beyond the transfer.

Inspect hash-chained audit events, QRC-20 operations, compliance outcomes, webhooks, and verified contract artifacts without leaving the control plane.

Global QRC catalogue and tenant-owned artifacts
Dynamic contract deployment from verified ABI
Signed webhook delivery evidence

// AUDIT LOGCHAIN VERIFIED

transaction.policy_evaluatedactor · policy-engine09:40:11

approval.recordedactor · usr_8a4209:41:03

transaction.signedsigner · qey:sha256:98a4…09:43:19

HEAD 0x7f23a3…9b010c · PREVIOUS 0x1c92d4…090e

Policy & approvalsWallet and vault operationsAudit & investigationQRC-20 token operationsCompliance workflowsAPI & webhooksOperations controlArtifact verificationDynamic contract deploymentGlobal QRC catalogueProof-backed team signingMock Mode

// ENQLAVE / CUSTOMER-CONTROLLED SIGNING

Your keys.
Your machine.

EnQlave is the per-user signing boundary for Qustody. It generates encrypted master identities and wallet Qeys, verifies the exact transaction payload, and signs locally. Private keys never leave your machine.

QEY STOREEncrypted at restREQUESTExact payload reviewOUTPUTSignature only

EnQlave // QUSTODY SIGNERSTORE UNLOCKED

// SIGN REQUEST

Custody Transaction

TRANSACTION: tx_demo_7f3a85f6
SIGNING HASH: 0x89e4f1…b72c
DESTINATION: 0x71c4a8…9f20
NETWORK: QUANTUM SANDBOX · 20803
QEY: Primary settlement

// PRIVATE KEY REMAINS IN THIS ENQLAVE STORE

// DOWNLOAD ENQLAVE

Put the signing boundary on your machine.

Verify SHA256SUMS ↗

LINUX

Debian / Ubuntu

x86-64 · loading latest version…

Download .deb ↓

LINUX

Fedora / RHEL

x86-64 · signed package

Download .rpm ↓

WINDOWS

Windows installer

x86-64 · loading latest version…

Download .exe ↓

MACOS

Apple Silicon

Apple Silicon · coming soon

Installer .dmg

// API / BUILD THE CONTROL PLANE IN

One request enters the full custody lifecycle.

Create a transfer through the real Qustody API. The response enters policy evaluation and authorization before an external Qey signature can broadcast it.

Read the API documentation →

REQUESTPOLICYSIGNINGPOST /v1/transactions

curl -X POST https://app.qustody.io/v1/transactions \
  -H "Authorization: Bearer $QUSTODY_API_KEY" \
  -H "X-Idempotency-Key: transfer-2026-001" \
  -H "Content-Type: application/json" \
  -d '{
    "networkCode": "QUANTUM_SANDBOX",
    "sourceWalletId": "6b5f0c8a-...",
    "destinationAddress": "0x71c4a8...9f20",
    "assetId": "b109a768-...",
    "amount": "1500000000000000000",
    "note": "Treasury rebalance"
  }'

201 · PENDING AUTHORIZATIONpolicy evaluation → approval quorum → Qey signature

// SECURITY ARCHITECTURE

Inspect the boundary, not the adjective.

Qustody’s security model is expressed as separated responsibilities and observable evidence, not an unverifiable certification wall.

PRIVATE KEYSCustomer controlled

Generated, encrypted, and used in the institution's signing environment.

SIGNINGEnQlave / external flow

The exact approved payload is retrieved, reviewed, and signed with its registered Qey.

AUTHORIZATIONRBAC + policy engine

Role capabilities and transaction rules gate operations before signing.

GOVERNANCEMulti-party approval

Quorum state and attributable decisions travel with the transaction.

AUDITABILITYHash-chained records

Event order and integrity remain inspectable across the workflow.

NETWORK PATHQeys + Quantum Chain

Post-quantum signatures are verified before broadcast and confirmation tracking.

// PRICING

Build before buying.

Start with the real product on devnet. Move to mainnet and higher operational limits when your institution is ready.

// SANDBOXFREE

Real product.
Zero commitment.

Build and test the custody lifecycle end to end on devnet.

Devnet only
2 vaults · 25 wallets
3 seats · 2 test tokens
25,000 transactions / month
Docs support

Create free sandbox ↗No card required

// LAUNCH$24,000/yr$2,400/mo

Go live on Quantum Chain.

For teams launching their first custody product.

Mainnet + devnet
25 vaults · 5,000 wallets
10 seats · 2 tokens
100,000 transactions / month
Email support · 99.5% SLA

Create organization →$2,400/mo billed monthly · save 17%or $24,000/yr with 2 months free

// INSTITUTIONAL$95,000/yr$9,500/mo

Dedicated operational scale.

For growing platforms with advanced control requirements.

Dedicated tenancy
250 vaults · 50,000 wallets
50 seats · 10 tokens
1,000,000 transactions / month
24×5 support · 99.9% SLA

Create organization →$9,500/mo billed monthly · save 17%or $95,000/yr with 2 months free

// ENTERPRISECustom

Your deployment boundary.

Self-hosted or dedicated managed infrastructure with bespoke terms.

From $20,000/mo · invoiced annually
Unlimited vaults, wallets, seats
Named TAM · custom terms
24×7 support · 99.95% SLA

Contact sales →Custom contract · manual invoicing

Automated checkout on Sandbox, Launch and Institutional requires accepting the Qustody Terms & Conditions and confirming purchase authority. Enterprise agreements are signed and invoiced directly.

// YOUR SANDBOX IS READY

You have seen the control plane.
Now run it.

Create a Qustody organization and test wallets, policies, approvals, and post-quantum signing on devnet.

Create free sandbox ↗No card required · Devnet

// INSTITUTIONAL & ENTERPRISE

Talk through your operating model.

Tell us about your custody, tokenization, or deployment requirements. We will respond to the work email provided.