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Using a bearer authentication in this way sends the token in plain text , although, still over HTTPS. BitGo Express uses the provided token to calculate the correct authentication information, without exposing the token outside the BitGo Express application process. Auth V3 Auth V3 is similar to the Auth V2 scheme, with additional protections against replay attacks and protocol downgrades. Specifically, V3 adds the following verification steps to the Auth V2 scheme: Request timestamp validity window If the request timestamp on an incoming request is more than five minutes behind the server clock when a request is being checked for authenticity, it is considered invalid and the request is rejected with a Unauthorized.
Request replay checking In Auth V2, each incoming request must bear a valid hashed message authentication code HMAC which proves knowledge of the user's access token without revealing it to the BitGo server or the transport layer carrying the request.
If a previous request is replayed, the HMAC value remains valid and the BitGo server could be instructed to repeat a previous action for example, return a list of transfers or list wallet balances. Auth V3 prevents this type of attack by saving all valid HMAC values up to the duration of the request validity window.
Requests with HMAC values that were used for a previous request are rejected with a Unauthorized and not processed. Protocol downgrade protection To prevent Auth V3 requests from being captured and modified in an attempt to downgrade them to Auth V2 for replay, the authentication scheme version in the bitgo-auth-version request header is added to the HMAC subject calculated by the client and verified by the server. Since altering the auth version requires calculating a new HMAC value, which in turn requires knowledge of the user's access token, the bitgo-auth-version header cannot be altered by a man-in-the-middle to downgrade the auth version and perform a request replay attack.
Software Development Kit The BitGo web APIs allow developers to create and manage multi-signature wallets, manipulate their policies, and interact with multiple digital currencies over a single robust interface. Sensitive operations, such as the creation of user private keys and signing of transactions, must be performed client-side.
A private key and its corresponding public key are together known as a keypair. A wallet contains a collection of one or more keypairs and provides some means to interact with them. The public key commonly shortened to pubkey is known as the wallet's receiving address or simply its address. The wallet address may be shared and displayed freely.
When another party is going to send some amount of cryptocurrency to a wallet, they need to know the wallet's receiving address. Depending on a blockchain's implementation, the address can also be used to view certain information about a wallet, such as viewing the balance, but has no ability to change anything about the wallet or withdraw any tokens.
The private key is required to digitally sign any transactions to send cryptocurrencies to another address or to make any changes to the wallet. The private key must never be shared. If someone gains access to the private key to a wallet, they can withdraw all the tokens it contains.
If the private key for a wallet is lost, any tokens that have been sent to that wallet's address are permanently lost. Some are easier to use than others. Some store and back up private keys more securely.
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