Collaborative custody gives Bitcoin holders greater transparency and security when they use a financial provider. Participants share in key management of a multisignature quorum designed for each product with keys always being cold-stored.
Reduce risk of loss from hacks
Maintain transparency of assets
Share control only as necessary
Protect funds from exchange insolvency
Reduce single point of failure risk
‣ This solution makes accessing and administering multisig easy for the individual
‣ User controls 2-of-3 private keys, retaining ultimate sovereignty
‣ Unchained acts as either a backup or an active co-signer, providing both redundancy and transactional services
‣ In this 2-of-3 model, keys are held by three separate parties: a customer, Unchained and our third-party key agent (Citadel SPV)
‣ Our key agent acts primarily as a backup, creating redundancy and reducing the risk of trust in any one single party
When you don’t possess any keys, your exchange account or transactions can be frozen just like a bank account.
Without unique keys and addresses, exchange funds are often commingled and at risk of loss in the case of insolvency.
Assets held by third parties are at risk of unauthorized transfer if a user’s login and 2FA are compromised.
As high value targets for theft and fraud, exchanges are frequent victims of hacking attempts which result in a user's loss of funds.
‣ Reduce single point of failure risk
‣ Create threshold redundancy
‣ Industry-standard best practice
‣ Improve operational security by sharing key management burden across multiple parties
‣ Avoid co-locating keys sufficient to spend in one geographic location
‣ Reduce risk of monkey-wrench attack
‣ Multiple sources of entropy
‣ Create fewer honey pots
‣ Improve transparency & auditability for customers
‣ Limit service provider solvency risk
‣ Materially reduce attack vectors
‣ Difficult to compromise remotely
‣ Prioritize physical security
‣ Account and system controls amplify protocol strengths
‣ Active monitoring for suspicious activity
‣ Identify and intent verification
‣ Managed service, including offline co-signing
Our systems use unique per-customer, multisignature P2SH addresses. With vaults, these addresses are partially derived using a customer’s extended public keys (Unchained never has access to user private keys, ever). All Unchained keys use hierarchical deterministic (HD) wallets that are cold-stored on hardware devices, including offline air-gapped machines. We use well-tested, industry-standard open-source software to author and audit transactions.
We maintain an internal security policy and ensure that all personnel are trained to conform to it. Our hardware devices are stored in geographically-separated, physically secure locations and require identity verification to access. Wallet seeds are stored in physically secure locations separate from the wallets they restore. No devices or seeds are ever present or stored on-premise at Unchained corporate offices.
We employ high-level security throughout our IT infrastructure in accordance with PCI-compliance standards. We operate within a secure, private, firewalled network. All data is encrypted en route to/from and within our environment (at motion as well as at rest) using industry-standard AES-256 encryption. We require two-factor authentication (2FA) to access all sensitive resources. Employees are uniquely identified within our environment by a centralized identity management infrastructure. All access to systems are limited, minimal, & controlled by this infrastructure. We aggressively monitor all traffic to/from & within our environment & keep access, system, & application logs indefinitely (with user/system/employee identifiers).
We help our customers achieve a higher degree of security by offering a cosigning service. If requested by customers, we will verify both the identity & intent of a customer transaction prior to cosigning. A customer has the option to record a video verification of their identity that Unchained will use to validate transaction signing requests or for 2FA resets. This opt-in feature is only active if requested and includes the option to set transaction amount thresholds at which Unchained will actively verify identity & intent. This service helps high-net-worth customers enhance operational security related to high-value transactions.