Crypto-wallet implementations

A crypto-wallet is an application/component for managing crypto assets: generating or importing a wallet (private key, seed phrase), secure key storage, viewing balance, sending and receiving funds, signing transactions, connecting to blockchain networks and interacting with dApps/contracts. It can be non-custodial (keys with the user) or custodial (the service stores keys) — these are different responsibility models. Honestly about 'keys = funds', this is key: in crypto whoever controls the private key or seed phrase controls the funds. This gives freedom but also full responsibility: there is no 'bank' to restore access. Losing the seed phrase or key means irreversible loss of funds — we cannot return them, and no one can. This is a fundamental property, not a flaw. Honestly about irreversibility: blockchain transactions are irreversible. Send to the wrong place or fall for a fraudster — the money cannot be returned. We add confirmations and protection against errors, but the network's irreversibility itself is irremovable. Honestly about 'no absolute guarantee': we design security by best practices (key protection, safe signing, protection against typical attacks), and for non-custodial we do code-review (1075). But an absolute security guarantee does not exist in crypto, and anyone promising it is lying. Honestly about phishing and the human factor: a huge share of crypto losses is not a wallet hack but deceiving the user themselves (phishing, fake sites, extracting the seed phrase). This is beyond our technical control; we can warn and build in protection, but we cannot force a user not to hand their key to a fraudster. Honestly about the responsibility model: a custodial wallet (you store users' keys) is a huge responsibility and serious regulatory risk (essentially holding others' funds); non-custodial shifts responsibility to the user. The model choice must be made consciously — we honestly explain the consequences of each. Honestly about regulation: the status of crypto in Russia is uncertain — legal and tax aspects are on your side. Honestly about the effect: we give a securely designed, technically correct wallet, but not an absolute guarantee and not protection against deceiving the user themselves. Honestly about access: an understanding of the responsibility model and risks is needed. An important boundary: this is a wallet; contract audit — 1075; Web3 login — 1078; multi-sig — 1087; on/off-ramp — 1088. The base price starts from 120,000 ₽ (depends on features and the model).

• A wallet for managing crypto assets in the product is needed.
• Implementing key storage and signing safely yourselves is very risky.
• The responsibility is underestimated: losing the key = irreversible loss of funds.
• The model (custodial/non-custodial) and its consequences are not chosen.

• Wallet implementation (creation/import, balance, send/receive, signing)
• Secure design of key storage and transaction signing
• Connection to blockchain networks and dApps/contracts
• Choosing and honestly explaining the model (custodial vs non-custodial) and its consequences
• Code-review of our code (for non-custodial — see 1075)
• Honest boundaries (keys = funds; key loss is unrecoverable; irreversibility; no absolute guarantee; phishing beyond control; regulation is on you)
• Protection against typical errors and warnings for the user
• Documentation and handover

• A securely designed, technically correct crypto-wallet
• A conscious choice of the responsibility model (custodial/non-custodial)
• An honest assessment of risks and responsibility for keys
• Honest boundaries (key loss is unrecoverable; irreversibility; no absolute guarantee; phishing is on the user's side)

• We discuss the model (custodial/non-custodial), features and risks, honestly about responsibility
• We implement the wallet with secure key storage and signing, do code-review
• We build in protection/warnings, honestly set boundaries and hand over to you

• If the user loses the key/seed — will you restore access?

  No, honestly, and it is fundamental: in crypto whoever controls the private key/seed phrase controls the funds. There is no 'bank' to restore access. Losing the seed phrase = irreversible loss of funds; neither we nor anyone can return them. This is a property of the technology, not a flaw. We do secure storage and warn the user, but recovering a lost key is impossible. We are honest about this from the start.

• Will the wallet be 100% secure?

  There is no absolute guarantee, honestly: we design security by best practices (key protection, safe signing, protection against typical attacks) and do code-review (1075), but 100% security does not exist in crypto — anyone promising it is lying. Plus transactions are irreversible. We reduce risk as much as possible technically, honestly stating the limit, rather than pass the wallet off as 'absolutely secure'.

• What to choose — store keys yourself (custodial) or with the user?

  It depends, and the consequences are serious, honestly: custodial (you store users' keys) is a huge responsibility and serious regulatory risk, essentially holding others' funds. Non-custodial shifts responsibility for keys to the user (and the risk of losing them too). Plus a huge share of losses is phishing and deceiving the user themselves, beyond our control. We honestly explain the consequences of each model so the choice is conscious.