Crypto
Phishing-resistant access and contextual step-up for wallets, withdrawals and platform accounts where transactions cannot be reversed.
The challenge
In digital-asset platforms, transactions are irreversible and phishing is the dominant loss driver. Shared secrets and one-time codes can be relayed in real time by an attacker sitting between the user and the platform, meaning even a correctly entered SMS or app-based code offers little protection against a well-run phishing kit.
Regulators in several markets are also moving directly against OTP-based login for crypto platforms, pushing operators toward device-bound, phishing-resistant methods and stronger controls around device binding, recovery and monitoring — requirements that need to be built into the authentication layer rather than bolted on afterwards.
Key use cases
Phishing-resistant login
Passkeys built on FIDO2/WebAuthn remove the shared secret from the login process entirely, so a relayed or phished code cannot be used to authenticate, addressing the specific weakness that OTP-based login carries on crypto platforms.
Withdrawal and address-change step-up
Contextual rules apply a stronger challenge specifically to withdrawals, new payout addresses and account recovery, since these are the actions where an irreversible loss actually occurs, while ordinary trading and account browsing remain unaffected.
Device binding and recovery design
Authentication is tied to a specific, verified device, and recovery journeys are designed deliberately so that account recovery does not become the easiest route in for an attacker who has otherwise been locked out by passkeys.
Session and access monitoring
User observability gives platform teams a consolidated view of authentication events across accounts, supporting the kind of monitoring that regulators increasingly expect alongside device binding and phishing-resistant login.
Reducing OTP dependency
Shifting away from SMS and app-based OTP as the primary login method reduces exposure to real-time phishing relay attacks and positions platforms ahead of regulatory direction that already discourages OTP-based login in several jurisdictions.
Core capabilities
FIDO2 passkeys
Cryptographic, device-bound authentication that cannot be phished or relayed in the way a one-time code can.
Contextual step-up rules
Withdrawals and address changes carry their own authentication requirement, set independently of ordinary login.
Device binding
Ties authentication to a specific, previously verified device rather than a shared secret alone.
Decision logging
Every challenge and approval is recorded, supporting incident reconstruction after a disputed transaction.
User observability
A consolidated event timeline across accounts supports monitoring and compliance review.
Withdrawal to an unseen address
A withdrawal is requested to an address that has never been used by the account before. Under an OTP-only setup, an attacker who has already phished the account's password and intercepted a code could complete this withdrawal without further resistance. Instead, the platform requires a phishing-resistant passkey challenge on the device already bound to the account before the withdrawal proceeds, which a relayed code alone cannot satisfy. The context of the approval — the device, the timing and the fact that the address is new — is logged, giving the platform's security team a clear record to work from if the transaction is later disputed or investigated.
Expected outcomes
- Reduced exposure to real-time phishing relay attacks at login
- Withdrawals and address changes carry verification appropriate to their irreversibility
- Account recovery designed as a controlled path rather than a weak point
- A clearer record supporting incident reconstruction after disputed transactions
- Reduced reliance on OTP as the primary authentication method
How CyberLane helps
CyberLane helps crypto and digital-asset platforms assess where OTP-based login and recovery create the greatest exposure, and designs contextual step-up rules for withdrawals and address changes accordingly. We advise on device-binding and recovery workflow design, build the business case for moving to phishing-resistant authentication, and plan a proof of concept before overseeing implementation alongside Authsignal or a qualified delivery partner.
- Exposure assessment of current login and withdrawal authentication
- Contextual step-up rule design for withdrawals and address changes
- Device-binding and account-recovery workflow review
- Business case for phishing-resistant authentication rollout
- Proof-of-concept scoping and implementation oversight
CyberLane is independent and works on the decision rather than the deployment. Product-specific delivery is coordinated with the vendor or a qualified implementation partner.
Official vendor sources
Capability descriptions are based on the vendor's published materials; CyberLane's wording is independently written.
Evaluating Authsignal for Crypto?
We start with an independent conversation about where your exposure actually sits, before any technology decision is made.