KeyC
COLLABORATIVE BITCOIN CUSTODY

Bitcoin custody.
Shared control.

You hold two keys. KeyC holds an offline co-signing key. A custody service built around everyday approvals and a recovery path you control.

Explore custody Service plans

In development · Public enrollment opens later

Collaborative vault2-of-3
2/3
Shared responsibility.Two signatures authorize a transfer.
AYour everyday keyHeld on your signing device
BYour recovery keyKept separately by you
CKeyC co-signing keyHeld offline by KeyC
A + C

You approve. KeyC reviews and co-signs under your policy.

Illustration of the planned custody service
2 of 3

Signatures authorize a transfer

A + C

Your approval, with a KeyC co-signature

A + B

Your independent recovery path

THE CUSTODY MODEL

Your keys.
An extra layer of care.

Shared signing brings support into your custody setup while keeping the key ownership and recovery paths explicit.

Offline co-signing

A dedicated platform key adds a second approval to your everyday transfers. KeyC cannot move funds with its key alone.

KEY C / HELD OFFLINE

A policy before a signature

Planned controls include spending limits, review delays and a pause on KeyC co-signing. These controls apply to the KeyC signing path.

REVIEW / THEN CO-SIGN

Recovery you can prepare

You keep a separate recovery key and your wallet configuration. Your two keys preserve an independent route out.

KEYS A + B / YOUR EXIT
HOW IT WORKS

A clear process.
From setup to signing.

One vault brings your devices, the platform co-signature and the steps that still need your attention together.

  1. 01

    Build your vault

    Register your two public keys, add the KeyC co-signing key and verify the complete vault on your signing devices.

  2. 02

    Set your guardrails

    Review your service terms and co-signing policy. Save the wallet configuration and recovery instructions separately.

  3. 03

    Approve your transfers

    Check the transaction on your device and sign. KeyC reviews its co-signing request before adding the second signature.

  4. 04

    Keep a way forward

    Maintain your backup key and configuration. A + B can authorize a recovery transfer independently of KeyC.

INDEPENDENT BY DESIGN

Your recovery path
stays in your hands.

Keep A and B, plus the complete wallet configuration, under your control. Together they can authorize a transfer without the platform.

Two signing keys + wallet configuration
A+B
Independent recovery

No KeyC co-signature required

SERVICES & FEES

Custody is a service.
The fees should be clear.

Choose wallet coordination on your own, or the planned KeyC custody service with an offline platform co-signature.

CORE SERVICE

KeyC Custody

Collaborative custody, with a second approval.

Pricing at launchPlanned annual service · Per vault
  • You hold A and B; KeyC holds C offline
  • Everyday co-signing with a review policy
  • Spending controls on the KeyC signing path
  • Recovery coordination and an independent A + B exit
Service scope and final fees will be published before enrollment.
SELF-CUSTODY

Self-managed

Wallet coordination, with all keys held by you.

FreeNo platform custody or co-signing
  • You hold all three keys: A, B and U
  • Coordinate signing with your own devices
  • Keep your wallet configuration and backups
Service availability and supported devices will be confirmed at launch.

Service fees and Bitcoin network fees are separate.

The annual plan, any additional service charges and applicable terms will be shown before payment. Network fees go to the Bitcoin network. There is no public payment or enrollment during development.

A FEW IMPORTANT QUESTIONS

Know who holds
what matters.

Key ownership, recovery and fees, explained before you commit.

Contact KeyC
Who holds the keys?

You hold A, your everyday key, and B, your separately stored recovery key. KeyC holds C offline. The vault requires any two of the three keys to sign a transaction.

Can KeyC move my bitcoin on its own?

No. A single KeyC key cannot meet a 2-of-3 signing threshold. Everyday transfers are designed to use one of your keys and the KeyC co-signing key.

Can I recover without KeyC?

Yes, provided you retain your two signing keys and the complete wallet configuration. The A + B path does not require a KeyC co-signature. Account recovery files alone cannot sign a Bitcoin transaction.

What do limits and delays protect?

They govern requests for the KeyC co-signature. They do not prevent the separate A + B recovery path, and cannot revoke a Bitcoin signature that has already been produced.

How will the service be priced?

The planned custody service uses an annual service plan. Final prices, included co-signing support and any separate recovery charges will be published before enrollment. Bitcoin network fees are separate.

Can I start using the custody service today?

KeyC is in development. Public enrollment and paid custody are not open yet. Service availability, supported signing devices and operating terms will be published before launch.