Approval binding
ImplementationRecipient, amount, chain, policy, expiry
ValidationChanged intent, expiration, revoked authority
External integrations with approvals and records
Validate external modules and signing requests with access, retry and audit controls
An external system sends the same request again.
- Input
- Request identifier · signature · sender
- Review
- Validity, permissions and processing history
NEXT ACTION
Return the existing result and prevent duplicate execution
IMPLEMENTATION SCOPE
Permissions matched to integration scope
Separate signing, operational and administrative permissions and validate API and contract inputs. Define key storage and rotation, allowed scope, change records and stop conditions.
- What we build
- Permission/signing policies · integrations · validation scenarios · operating procedures
- What we validate
- Excess permissions, key rotation, signature replay and invalid or failed provider responses
When this service helps
When failed integrations or duplicate requests can affect important operations
- 1
Verify a request and its sender
- 2
Check permissions, signatures and duplicates
- 3
Store the result and audit record
What the project delivers
- External module integration
- Approval, signature and duplicate checks
- Failure scenarios and audit records
Specific features, integrations and operating support are agreed in the project proposal
Start by reviewing your integration needs
Tell us about the chain, custody, approval policies, external modules and operating responsibilities. We will define the needed functionality and acceptance scope.
Discuss this serviceTechnical design and acceptance criteria
Details for technical reviewers. Architecture and acceptance criteria are agreed for the actual environment and project scope.
- Threat modeling
- KMS / HSM / MPC
- Webhook verification
- Fail-closed policy
Processing flow and exceptions
Treat requests and external-check results as untrusted inputs. Only policy-approved work enters the signing boundary; timeouts and unknown results become holds rather than implicit approval.
Architecture summary
- Approval binding — Recipient, amount, chain, policy, expiry
- External checks — Raw-body signature, event ID, result freshness
- Emergency operation — Rotation, stops, audit, recovery ownership
02Acceptance criteria
Implementation and acceptance criteria
Concrete design decisions and acceptance scenarios to agree for the project.
External checks
ImplementationRaw-body signature, event ID, result freshness
ValidationForgery, replay, timeout, unknown result
Emergency operation
ImplementationRotation, stops, audit, recovery ownership
ValidationExercise signing suspension and authorized recovery
Technology choices and acceptance criteria depend on discovery, integrations, and agreed scope. We define reproducible acceptance scenarios and handover evidence for the operating environment.
03Implementation details
Engineering decisions
in detail
From visible features to failure conditions,
we work through the decisions before launch.
Model approval authority and attack paths before selecting keys
Map protected assets, users, administrators, service identities, and attack or failure paths. Successful sign-in is not approval to move assets: bind approval to recipient, amount, chain, and policy version. Recheck intent and expiry immediately before signing to reduce time-of-check/time-of-use gaps where an approved request changes before execution.
Compare cryptography alongside key-operation constraints
Check supported curves, signature formats, exportability, throughput limits, and audit capabilities for KMS or HSM options. MPC and multisignature have different participants, quorum, recovery, and refresh models. Place signing APIs behind policy controls and restrict callers so application access does not become unrestricted authority to sign arbitrary digests.
Verify authenticity, freshness, and replay of external results
Map provider request IDs, webhook signatures, and result states for identity, transaction screening, or Travel Rule services. Distinguish timeout, error, review, and expiry from approval and provide retries and a manual queue. Verify signatures over the original body and use event deduplication and freshness checks to limit replay.
Trace approval and recovery without exposing secrets
Audit actor, policy version, request hash, approver, and outcome without recording raw secrets. Define log access, tamper detection, and retention. Exercise key rotation, participant changes, provider failure, and emergency stops. Specify independent penetration tests, cryptographic review, and security audits as concrete additional scopes with clear ownership.
04Handover
Detailed deliverables
- Threat and responsibility models with key, access, and approval policies
- Selected security and screening adapters with audit records
- Failure and recovery tests and emergency-stop and rotation procedures
05Before implementation
Questions before implementation
- Assets to protect and existing key-management and identity systems
- Approval stages, limits, and external screening and audit requirements
- Provider contracts, API access, and operating ownership
How your project moves forward
Discover
Understand your goals, workflows, and operating environment.
Define
Define features, priorities, and integration requirements.
Build
Build the agreed scope and review progress together.
Launch & Operate
Prepare testing, deployment, and operational handover.
Let’s discuss your project
Tell us what you want to build or improve
Our team will review your request and reply by email