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H2K is a crypto custodial wallet that utilizes a multi-sig mechanism to ensure the security and authorization of transactions.

H2K consists of:

Black Box - this is a control server with cryptographic signing capabilities to interact with the blockchain.
The multi-signature wallet – is the same as a regular blockchain wallet, but users do not need to interact directly with the blockchain. It can be seen as an online payment processing system, as H2K's server handles managing the wallet's private key and transaction processing.
API – for businesses to connect to the multi-signature wallet.

With the help of the API, companies can send requests to Safina to create multi-signature wallets and conduct transactions using them.

Connectivity Options

Our team has successfully developed both a web version and a mobile application of the H2K service, providing clients with the flexibility to utilize these tools based on their level of experience in blockchain technologies.

The web version, known as H2K Lite, offers a simple and intuitive interface, catering to users who seek convenient management of their multisignature wallets.

The H2K Pro mobile application encompasses the full functionality of the service and is tailored for more experienced clients who have prior familiarity with multisignature and custodial wallets.

The relevance

Increasing interest in working with crypto assets;
Transition of many financial services to crypto assets;
Need for conducting cross-border payments.

Due to the spread of crypto assets, new solutions are required for easy access to the blockchain and secure transaction processing.

In the modern world of crypto assets, there are 2 main issues that stand out:

Preserving the secret key from loss;
Distributing access to the secret key among potential wallet owners.

The project's Hidden Keys (hereinafter referred to as H2K) know-how is a fast and secure blockchain technology that functions as a multi-signature wallet. It includes a unique technology with a well-thought-out security system that corresponds to AES.

The solution significantly expands the capabilities of smart contracts, providing access to real-world data and autonomous computations while preserving the security and reliability guarantees inherent in blockchain technology.

Black Box (BB) - the core of the service.

To create a transaction, wallet participants must provide their signature. In our case, the signature can be of two types:

A generated BB digital code is sent to the participant's email or phone.
A generated BB key pair using the elliptic curve method, with the public key shared with the participant.

Functionality of H2K

Functionality of H2K
Supported Blockchains and Tokens: H2K provides full coverage of the Bitcoin (BTC) blockchain and supports the TRON and ETH blockchains, including tokens such as TRX, ETH, and USDT (TRC-20, ERC-20). In the near future, we plan to add support for other tokens.	Convenience: We offer wallet import functionality, the creation of multi-signature wallets (up to 9 signatories), and the ability to create multiple wallets for a single user.	Multi-signature Wallets:We offer a unique offline method for creating, signing, and verifying transactions.

Signature verification and collection

The management server is responsible for collecting signatures. It passes the collected signatures to BB, which, in the case of codes, verifies the received signatures against the generated ones. In the case of key signing, BB verifies the participants' keys against those specified during the wallet creation. After successful verification by BB, the transaction is sent to the network.

Successful verification criteria: