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Signalayer

MarketingOfficial website

Signalayer is an advertising signal and identity resolution platform that enriches ad targeting and measurement using device, browser, and contextual data. It assists advertisers in reaching audiences across cookieless environments by combining first party identifiers, hashed emails, and probabilistic signals. Because it processes online identifiers used for advertising, it qualifies as non essential and requires prior, freely given consent under the GDPR and ePrivacy Directive.

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Overview

What does Signalayer do?

What Signalayer is and how it works

Signalayer is an advertising technology that operates as a signal layer between publishers, advertisers, and demand side platforms. It collects identifiers, behavioural signals, and contextual data from visitors of a website or mobile application and resolves them into audience segments used for targeting, frequency capping, and conversion measurement. The script is typically loaded through a tag manager and writes cookies in the publisher domain while also calling Signalayer servers for enrichment and matching with partner identity graphs.

Data and cookies collected

Signalayer typically processes IP addresses, user agent strings, page URLs and referrers, screen and language settings, hashed email addresses when shared by the publisher, and probabilistic identifiers derived from these signals. Persistent cookies are written to remember the visitor across sessions, while session cookies maintain the matching state during a visit. Because IP addresses and online identifiers are personal data under the GDPR, this processing falls fully within the regulation.

GDPR and ePrivacy implications

Reading and writing identifiers in a user terminal for advertising purposes triggers Article 5(3) of the ePrivacy Directive. National regulators including the CNIL in France, the BfDI in Germany, and the AEPD in Spain consider this kind of advertising tracking strictly non essential. The lawful basis must therefore be consent under Article 6(1)(a) GDPR and not legitimate interest. The European Data Protection Board has confirmed this position in its guidelines on consent and on connected vehicles.

International data transfers

Signalayer infrastructure is operated from the United States and may share signals with partners worldwide. Transfers of European personal data require an Article 46 GDPR safeguard, generally Standard Contractual Clauses combined with a Transfer Impact Assessment, or reliance on the EU US Data Privacy Framework when the recipient is certified. Document the safeguard, list onward recipients, and inform users transparently about international transfers in your privacy notice.

Practical compliance steps

Block the Signalayer tag until consent is granted through a TCF v2.2 compatible consent management platform. List Signalayer in your cookie banner under the marketing or advertising category with a clear description of its purpose. Document the consent in your records of processing, retain proof for at least three years, and offer an equally easy refuse option. Finally, review your data processing agreement with Signalayer to confirm SCCs and the DPF status are in place.

Compliance

Signalayer and the GDPR

Signalayer is classified as “Marketing”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy.

Legal basis
Consent (Article 6(1)(a) GDPR and Article 5(3) ePrivacy Directive)
Risk level
high
Applicable regulations
GDPR, ePrivacy Directive, French CNIL guidelines, German TTDSG, Spanish LSSI CE

Impact assessment (DPIA)

A DPIA is recommended when Signalayer is combined with large scale audience profiling, retargeting, or cross site tracking. Document the categories of personal data, recipients, retention periods, and the legitimate interests assessment for any first party processing. Verify the DPF certification status of the controller and assess the impact of US disclosure laws on EU residents.

Sample text for your banner

We use Signalayer to power advertising and audience measurement. With your consent, Signalayer reads device, browser, and identifier signals (including IP address, user agent, hashed identifiers, and cookies) to deliver and measure ads. You can accept, refuse, or change your choice at any time from our cookie preferences.
Cookies and trackers

What Signalayer sets and contacts

Tracking method
JavaScript pixel and first/third party cookies, server side identity resolution
Server location
United States
Data transferred outside the EU
Data is transferred to the United States. Transfers rely on Standard Contractual Clauses and the EU US Data Privacy Framework where the vendor is certified.

Cookies set (4)

NameTypeDurationPurpose
_slr_uidpersistent12 monthsStores a pseudonymous Signalayer user identifier used for ad targeting and frequency capping.
_slr_syncpersistent6 monthsTracks identity sync status with Signalayer partner platforms and demand side platforms.
_slr_sesssessionsessionMaintains the Signalayer matching state during a single visit.
_slr_consentpersistent13 monthsStores the user consent signal so the Signalayer tag adapts behaviour to the user choice.

Third-party domains contacted (4)

  • signalayer.com
  • cdn.signalayer.com
  • pixel.signalayer.com
  • sync.signalayer.com
Questions

Frequently asked questions about Signalayer

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What cookies and identifiers does Signalayer set?

Signalayer typically writes one or two persistent cookies in the publisher domain to store a pseudonymous user identifier and a sync state, plus short lived session cookies used during signal matching. It may also store a hashed identifier in browser storage when first party data such as a hashed email is shared by the publisher.

Is consent required to use Signalayer in Europe?

Yes. Because Signalayer reads and writes identifiers in the user terminal for advertising purposes, Article 5(3) of the ePrivacy Directive requires the prior, freely given, specific, informed, and unambiguous consent of the visitor before any signal is collected.

What is the legal basis for processing personal data with Signalayer?

The lawful basis is consent under Article 6(1)(a) of the GDPR. Legitimate interest is not appropriate for advertising profiling, as confirmed by the EDPB and several national supervisory authorities.

Does Signalayer transfer data to the United States?

Yes. Signalayer infrastructure is operated from the United States. Transfers rely on Standard Contractual Clauses combined with a Transfer Impact Assessment, or on the EU US Data Privacy Framework if the recipient entity is certified.

Do I need a Data Protection Impact Assessment?

A DPIA is recommended whenever Signalayer is used at scale or combined with cross site tracking, retargeting, or sensitive audience inference. The DPIA should cover proportionality, risks to rights and freedoms, and the safeguards in place.

How do I implement Signalayer in a compliant way?

Load the script only after explicit consent through a TCF v2.2 compatible CMP, document the consent, expose a refuse option as easy as the accept option, list Signalayer in your privacy policy, and ensure the data processing agreement and SCCs are signed.

Are there alternatives to Signalayer?

Yes. Cookieless contextual advertising, server side first party measurement, and privacy preserving identity solutions such as the Privacy Sandbox or hashed email based deterministic graphs operated within the EU are alternatives that reduce the need for cross site tracking.

How should I update my cookie policy for Signalayer?

Add a dedicated entry naming Signalayer, the controller or joint controller, the processing purpose, the cookie names and durations, the recipients, the legal basis (consent), and the international transfer safeguards. Link to the Signalayer privacy notice and to the cookie preferences page.

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