SIGBRO keeps the private key to your Ardor blockchain account safely encrypted.
SIGBRO does not collect private information. We register which Ardor accounts use SIGBRO. We do not collect your phone number, IMEI (your device’s unique serial number), email address, or any other information that can be used to identify you, and we CAN not connect your account to your ID via the mobile device you use.
When you use the SIGBRO app to log in to an online UI, your IP address is sent to their server - if it’s the SIGBRO wallet, an online SIGBRO Ardor node, or another Nxter.org service then your IP is sent to Nxter.org’s servers. If you log in to a website hosted by XYZ, then the XYZ server will get your IP address. You can always hide your IP by using a VPN.
Public blockchains (like Ardor's) are pseudonymous by design. If you link your Ardor account to your identity, all transactions from that account will be linked to your identity. It is up to you to decide whether that's a good or a bad thing for you. The SIGBRO Team (or me personally, at least) promotes and supports the idea of using Ardor accounts as Digital ID with all the benefits that will bring, but we don't make decisions for people - only software.
The SIGBRO app lets you import or create Ardor accounts, and use them to log in to wallets, clients, and services, register with membership sites, and prove ownership of your account (authenticate) without ever entering your account's passphrase. Kind of like you can log in with Twitter, Facebook, and Google accounts, but with Ardor you have tokens in your account too, and advanced blockchain features, a full economical framework on blockchain, and complete control over your funds and actions.
With the SIGBRO app you can sign transactions. You can set them up on any SIGBRO-compatible local client or online service, the SIGBRO app always lets you review the transaction details before you sign. You can make payments, trade on the blockchain, sign documents, or upload and timestamp files in the blockchain.
What you do on the blockchain is registered on the blockchain and forever trackable to the account you use. What you do is YOUR responsibility. SIGBRO only provides one of more ways for you to use your Ardor account and sign transactions that you, yourself, set up, check, and confirm - nobody but YOU can see or control your account or any transaction you make from your account, before you send it. The SIGBRO team is not responsible and can not be held responsible for any transaction you make on the Ardor blockchain or any of its child chains.
Recommended reading: What Is The SIGBRO App - how you can use the app.