# Unbound CASP Signing App — Unbound Crypto Asset Security > Securely sign cryptocurrency and blockchain transactions for business users. (iPhone/iPad app by Unbound Tech Ltd.) - Source: https://appshunter.io/ios/app/unbound-casp-signing-app/id1449574373 (this page in markdown: same URL + `.md`) - Developer: [Unbound Tech Ltd](https://appshunter.io/developer/1021194062) - Category: Business, Finance - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 12.1 · 23 MB - Languages: American English - Released: 2019-04-12 - Data updated: 2026-06-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/unbound-casp-signing-app/id1449574373/reviews.md ## What is Unbound CASP Signing App? The Unbound CASP app allows business users of Unbound Tech’s Crypto Asset Security Platform (CASP) to sign their cryptocurrency and blockchain transactions securely from any iOS mobile device. The mobile app is an integral part of the the CASP system, managing the following entities: Accounts - a container for a set of vaults and participants that manage these vaults. Participants - a human within the account or a BOT taking part in cryptoasset transactions. Each participant owns a share of the cryptographic material that is part of the different transactions. Vaults (Wallets) - a secure container for the cryptographic material used to protect a crypto asset (i.e. the seed or private key). Quorum vault - shares the responsibility and distributes the trust of executing a transaction between many different participants in a structure defined by the vault policy. CASP is a collaboration service, where different participants collaborate to perform crypto asset transactions. As such, it has inherent support for asynchronous operation. When an operation is triggered, it is located in a queue and completed when the relevant set of participants complete their part. CASP supports triggering asynchronous operations, notifying the relevant participants on required actions, and checking the status of operations. ## Key features - Secure transaction signing - Cryptocurrency and blockchain support - Account and participant management - Secure vault management - Collaborative transaction execution - Asynchronous operation support ## Frequently asked questions about Unbound CASP Signing App ### What is Unbound CASP Signing App used for? Unbound CASP Signing App is used by business users to securely sign cryptocurrency and blockchain transactions from their iOS mobile devices as part of the Unbound Crypto Asset Security Platform (CASP). ### What entities does Unbound CASP Signing App manage? The app manages Accounts (containers for vaults and participants), Participants (users or bots in transactions), and Vaults (secure containers for cryptographic material like private keys). ### How does Unbound CASP Signing App handle transaction execution? It supports collaborative transaction execution through Quorum vaults, where multiple participants share responsibility based on vault policies. Transactions are processed asynchronously when required participants complete their parts. ### What platforms does Unbound CASP Signing App support? The app is available for iPhone and iPod devices, as indicated by its supported devices list. ### What is the age rating for Unbound CASP Signing App? Unbound CASP Signing App has an age rating of 4+, making it suitable for a broad audience. ### How often is Unbound CASP Signing App updated? The latest version, 1.0.8, was released on July 4, 2021. The app was initially released on April 12, 2019. ### Is Unbound CASP Signing App free to use? Yes, Unbound CASP Signing App is available for free download and use. ### What is the user sentiment for Unbound CASP Signing App? The app has received a perfect rating of 5.0 stars from one user review, indicating very positive initial feedback. ## Version history (last 5 releases) ### 1.0.8 — 2021-07-04 Bug fixes ### 1.0.7 — 2020-07-21 - Bug fixes. ### 1.0.6 — 2020-07-12 - Support added for Bech32 BTC addresses. - Added option to connect over a secure proxy. - Bug fixes. ### 1.0.5 — 2020-01-06 Bug fixes ### 1.0.4 — 2019-09-08 The following updates are included in this version: 1. The CASP mobile app can be used for 2-Factor Authentication when accessing the CASP Web UI. 2. Updated for compatibility with the CASP server version 1.0.1906. 3. Bug fixes. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*