Jscrambler vs Proteside: script control or payment verification?
By Laís Peixoto
Growth Marketer, Proteside
Published
Jscrambler protects a company's own JavaScript and, through Webpage Integrity, inventories and controls the scripts on the payment page with PCI DSS evidence. Proteside keeps that inventory and checks the payment itself: it compares the QR code, account identifier, bank slip line and wallet address with what the merchant issued, and blocks a swap before confirmation.
Side by side
- How it describes itself
- Client-side security platform with two products: Code Integrity, which protects the company's own JavaScript, and Webpage Integrity, which controls the scripts running on the page. Iframe Integrity serves payment service providers.
- Headquarters
- Porto, Portugal. Founded in 2014.
- How it enters the site
- JavaScript agent added by snippet or tag manager, recommended as one of the first scripts to load; or Agentless Monitoring, where a synthetic user visits the pages the customer lists.
- What it checks on the payment page
- First-, third- and fourth-party scripts, behavioral drift against historic baselines, access to forms, cookies and browser storage, and outbound network requests.
- PCI DSS
- Requirements 6.4.3 and 11.6.1, with a compliance module and assessment-ready reports. The site runs a program called QSA Alliance.
Jscrambler Webpage Integrity
- How it describes itself
- Cybersecurity layer for the moment of payment: integrity of what the buyer sees, copies and confirms.
- Headquarters
- São Paulo, Brazil. Operating since 2026.
- How it enters the site
- One line of code on the payment page, or an integration in the platform or payment provider template. No proxy, no DNS or CDN change.
- What it checks on the payment page
- Third-party scripts, card form, Pix QR code and key, boleto (Brazilian bank slip) line, crypto wallet address and the QR codes of eight instant payment rails, matched against what the merchant issued.
- PCI DSS
- Evidence for PCI DSS requirements 6.4.3 and 11.6.1, with an exportable report for the QSA.
Proteside
Criterion by criterion
Marks are based on each vendor's public documentation. Hover over or tap a mark to read the legend.
| Jscrambler | Proteside | |
|---|---|---|
| What is checked on the payer's screen | ||
| Inventory and authorization of scripts on the payment pageThe basis of requirement 6.4.3: know what runs on the page and authorize each script. | Described in public documentation | Described in public documentation |
| Card details typed into the formStop a script from copying the number, expiry date and security code. | Described in public documentation | Described in public documentation |
| Pix QR code and copy-and-paste code (Brazil)Brazil's most common checkout scam: the QR code shown leads to another account. | Not found in public information | Described in public documentation |
| Boleto (Brazilian bank slip) payment lineA swapped line pays a different payee for the same amount. | Not found in public information | Described in public documentation |
| QR codes of instant payment rails worldwide (UPI, PayNow, DuitNow, PromptPay, QR Ph, FPS, CoDi, Transferencias 3.0)The same swap as Pix, across eight instant payment systems. | Not found in public information | Described in public documentation |
| Stablecoin and crypto wallet address, including when copiedA wallet address swapped on screen or in the clipboard is irreversible. | Not found in public information | Described in public documentation |
| Matches what is on screen against what the merchant issued and blocks the swap before confirmationThe check that defines payment integrity: payee and amount equal to what was issued. | Not found in public information | Described in public documentation |
| How it protects | ||
| Blocks unauthorized scripts in the buyer's browserDetecting after the fact does not bring the copied data back. | Described in public documentation | Described in public documentation |
| Watches real buyer sessionsTargeted scams do not show up in simulated visits. | Described with a limitation (optional, sampled, requires human action or only in one product tier)1 | Described in public documentation |
| Works without changing CDN, DNS or proxyDrops into any platform with one line of code. | Described in public documentation | Described in public documentation |
| PCI DSS compliance | ||
| Evidence for PCI DSS requirement 6.4.3Inventory, authorization and integrity of scripts. | Described in public documentation | Described in public documentation |
| Evidence for PCI DSS requirement 11.6.1Unauthorized changes to the page and its headers. | Described in public documentation | Described in public documentation |
| Exportable report for the assessor (QSA)Evidence has to leave the dashboard and reach the assessment. | Described in public documentation | Described in public documentation |
- Described in public documentation
- Described with a limitation (optional, sampled, requires human action or only in one product tier)
- Not found in public information
- The vendor states it does not do this
Notes on the marks
- 1Watches real buyer sessions: The public getting-started guide describes two modes. With the agent, the script observes and blocks in real shopper sessions. In Agentless Monitoring, a synthetic user visits the payment pages the customer lists; by the vendor's own description, that mode does not follow each shopper's browser.
Where Jscrambler stands out
Code and page from one vendor
Code Integrity hardens the JavaScript a company writes against reverse engineering; Webpage Integrity governs the scripts that run on the page. A team that needs both deals with a single supplier.
Blocks the action, keeps the script
Form Fencing stops an unauthorized script from reading form fields, and Network Transfer Control governs outbound requests. The public material describes intercepting the risky action rather than removing the whole script.
Iframe Integrity for payment providers
A separate product protects the payment iframe inside the merchant's checkout, with defenses against iframe and form overlays, and asks nothing of the merchant.
Behavioral baselines
Behavioral Drift Detection compares each script's behavior with its own history and scores vendor risk from live browser telemetry.
What Proteside checks that Jscrambler's material does not mention
An electronics store in Bengaluru shows a UPI QR code for a 42,000 rupee order. The shopper opens a payment app, scans the code and approves. A compromised plugin on the checkout had already replaced the QR with one pointing to a different account, same amount. The money leaves, the order never settles, and no card form was involved at any point.
Webpage Integrity answers the card problem with script control, fencing around forms and rules on outbound requests. Its public documentation does not describe checking whether the QR code, the account identifier, the Brazilian bank slip (boleto) line or the wallet address on screen is the one the merchant issued. Proteside records those values when they are issued and compares them, in the shopper's browser, with what is displayed and what is copied. On a mismatch, confirmation is blocked and the attempt is logged as evidence.
The same line of code inventories the scripts, protects the card form and keeps the change history that requirements 6.4.3 and 11.6.1 call for. One install covers credit cards, debit cards, UPI, PromptPay, PayNow, DuitNow, FPS, Pix, boleto and stablecoin wallets from the same dashboard.
How each one enters your operation
Jscrambler
- Agent by snippet, with the injection usually done by the customer's DevOps team, or by tag manager; the guide recommends loading it among the first scripts on each page.
- A no-code option: Jscrambler sets up a synthetic user that visits the payment URLs the customer provides.
- Onboarding with a named champion, mapping of sensitive forms, weekly configuration meetings and quarterly reviews of allow-lists.
Proteside
- One line of code on the payment page, on any e-commerce platform, or a single integration in the platform's or the payment provider's template.
- Every purchase session is checked, on every payment page, with no synthetic user and no list of URLs to maintain.
- The swap is blocked before confirmation; dashboard, API and alerts by email, Slack, Teams and webhook record each attempt.
When to choose each one
Jscrambler makes sense when
- Your application's JavaScript needs protection against reverse engineering and you want one vendor for both the code and the page.
- You are a payment service provider delivering the checkout in an iframe and want to protect merchants without asking them to install anything.
- Cards are the main payment method and your security team wants policies by script behavior, with historic baselines and periodic allow-list reviews.
Proteside makes sense when
- Your checkout accepts UPI, PromptPay, PayNow, DuitNow, FPS, Pix, boleto or stablecoins, and the risk is a swapped payee.
- You need the swap blocked in each shopper's browser, in every session, without relying on simulated visits.
- You want protection and evidence for requirements 6.4.3 and 11.6.1 from one install, with no configuration meetings.
Both together
A company that uses Code Integrity to protect its own JavaScript can keep that layer and add Proteside on the payment page to verify the QR code, account identifier and wallet address. If the Webpage Integrity agent blocks unknown scripts, Proteside's script is added to the allow-list like any other vendor; both run on the same page.
Frequently asked questions
Does Jscrambler cover Pix, boleto or QR codes?
Not in the public information we checked in October 2026. The Webpage Integrity material describes scripts, form fields, cookies, browser storage and outbound network requests.
Can Jscrambler and Proteside be used together?
Yes. They are two independent scripts on the payment page. If the Jscrambler agent is set to block scripts outside its list, Proteside's script is authorized like any other vendor. Proteside does not interfere with legitimate payments or with another tool's inventory.
What is the difference between Code Integrity and Webpage Integrity?
Code Integrity protects the JavaScript the company itself writes, with obfuscation and defenses against reverse engineering. Webpage Integrity observes and controls the scripts running on the page, third parties included, with the module for requirements 6.4.3 and 11.6.1. Proteside compares with the second one.
Does Jscrambler's agentless mode follow each shopper?
According to the public guide, Agentless Monitoring uses a synthetic user that visits the pages the customer lists. A swap that appears only to one shopper, such as a QR code replaced in a single session, is not seen by that visitor. Real-time blocking belongs to the agent mode.
We are a payment provider with an iframe checkout. Which one fits?
Jscrambler's Iframe Integrity was built for that case and protects the iframe with no merchant action. Proteside offers a single integration for providers and platforms that verifies the displayed payment in each session. The two can coexist in the same checkout.
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