Question 1

Why do I need to sign a message when creating or accessing my account on a different browser?

Accepted Answer

Creating and accessing your account

As STARKs use a different signature scheme to the Ethereum blockchain, a STARK keypair needs to be generated, which allows for the interaction with StarkWare's high-speed settlement system.

Every time a rhino.fi trader submits an order to the exchange, or makes a deposit/withdrawal, they are cryptographically signing a message using their Ethereum wallet private key, which instructs their rhino.fi trading key on the required action.

This is a process that is common to all self-custodial layer-2 exchanges that use zero-knowledge cryptography (STARKs, SNARKs etc).

When you register your Ethereum address with rhino.fi for the first time (the registration transaction), a rhino.fi trading key is generated behind the scenes in a trustless manner and is associated with your Ethereum address. You can think of your rhino.fi trading key as similar to an API key on a centralised exchange.

For this key to be created and encrypted with your Ethereum account, you are asked to sign a message when you create your account and any time you use a new browser, as your key needs to be regenerated to access your account

Question 2

Deposit Guide

Accepted Answer

How to deposit

You need to deposit tokens to rhino before you can enjoy gas-free & private swapping, trading and investing on rhino

rhino.fi is a layer 2 self-custodial platform based on the StarkWare StarkEx Layer 2 technology. Only you control your tokens on rhino - no one else can access them.

Create a rhino account

Go to app.rhino.fi
Connect one of the supported wallets to rhino.fi

Create your Layer 2 account on rhino. The two signatures create your account and allow you access to the rhino API. Only you control your rhino account (no one else can access) as rhino is a self-custodial platform (DEX)

Make your first deposit

Click the deposit button
You can deposit from a range of different layer 2’s (Arbitrum, Polygon, zkSync) as well as BNB Chain and Ethereum Mainnet

Select the token that you would like to deposit. Some tokens are only available on certain networks - for example, the AAVE token can be deposited from Ethereum. Tokens such as ETH can be deposited from many different chains

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Question 3

rhino.fi: Depositing Tokens

Accepted Answer

Depositing Tokens

Depositing Tokens To Your rhino.fi Account

This Video will take you through the steps required to deposit your tokens from your private wallet (MetaMask, Keystore or Ledger) to your rhino.fi exchange wallet on app.rhino.fi.

The rhino.fi exchange is what is known as a 'self-custodial' exchange. Instead of your tokens being held by a central party, deposited tokens are held by a series of open source smart contracts on the blockchain. These smart contracts take instructions from your private wallet every time you 'sign' a transaction, meaning that rhino.fi can only operate according to your instructions, for example to deposit, trade at a specific price or withdraw your tokens.

${youtube}Depositing tokens to rhino.fi

Question 4

rhino.fi: What is ERC20?

Accepted Answer

What is ERC20?

ERC20 refers to the Ethereum token standard, which is used for developing smart contracts on Ethereum. Developed in 2015, ERC20 defines a common set of rules that an Ethereum token has to follow and implement in order to interact with other tokens in the ecosystem, giving developers the ability to program useful new tokens.

The ERC20 standard guarantees that Ethereum based tokens perform in a predictable way throughout the ecosystem, ensuring that decentralised applications and smart contracts are interoperable and that all tokens follow a fixed standard of security.

ERC20 is one of multiple Ethereum token standards, but has proven to be the most widely adopted for now.

Resources

ERC20 Token Standard
What is ERC20?
ERC20 Tokens - What Are They Anyways?

Question 5

rhino.fi: Withdrawing Tokens

Accepted Answer

Withdrawing Tokens From rhino.fi.

You can withdraw by going to your rhino portfolio page and clicking the withdraw button in the top right hand corner of the page

Fast Withdrawals

Fast withdrawals arrive your on-chain wallet almost instantly.

Liquidity for fast withdrawals is limited by the amount of Liquidity Provider capital in the rhino bridge smart contracts

Ethereum: https://etherscan.io/address/0xaf8ae6955d07776ab690e565ba6fbc79b8de3a5d Polygon: https://polygonscan.com/address/0xBA4EEE20F434bC3908A0B18DA496348657133A7E Arbitrum: https://arbiscan.io/address/0x10417734001162ea139e8b044dfe28dbb8b28ad0 BNB Chain: https://bscscan.com/address/0xb80a582fa430645a043bb4f6135321ee01005fef zkSync Era: https://explorer.zksync.io/address/0x1fa66e2b38d0cc496ec51f81c3e05e6a6708986f Optimism: https://optimistic.etherscan.io/address/0x0bca65bf4b4c8803d2f0b49353ed57caaf3d66dc Polygon zkEVM https://zkevm.polygonscan.com/address/0x65a4b8a0927c7fd899aed24356bf83810f7b9a3f Linea https://lineascan.build/address/0xcF68a2721394dcf5dCF66F6265C1819720F24528 Scroll https://scrollscan.com/address/0x87627c7E586441EeF9eE3C28B66662e897513f33

Any limited fast withdrawal liquidity is replenished daily and you can withdraw up to 1/3 of the contract balance in one withdrawal

Fee - The rhino Bridge & withdrawal [fees](https://support.rhino.fi/en/article/rhino-withdrawal-br

Question 6

What Is the Most Secure Way to Connect To rhino.fi?

Accepted Answer

What Is the Most Secure Way to Connect To rhino.fi?

This article is meant as an overview of the technology, and should not be considered an endorsement of any individual wallet, or taken as any sort of crypto/wallet security advice. Please be sure to conduct your own research and make sure that you are comfortable holding custody of your own assets in the wallet of your choice before using rhino.fi, as well as making sure you understand how rhino.fi operates on layer 2.

You can connect to rhino.fi using one of the following wallets:

Metamask
Metamask + Ledger
Ledger
Other hardware wallet via Wallet Connect
Metamask Mobile
Trust Wallet (Mobile)

When you interact with rhino.fi (placing orders, swapping etc) you are interacting with rhino.fi technology on layer 2 using a special trading key. This trading key is necessary as the cryptography used by rhino.fi (STARKs) is different to that of the main Ethereum chain.

It is widely accepted within the industry that hardware wallets are the safest type, as they ensure that the Ethereum signing process happens on the device and not on your computer. Therefore, if your computer were to be compromised, your Etheruem key would (in theory) stay safe.

So which wallets are the most secure when interacting with rhino.fi?

Ledger Hardware Wallet

Connecting to rhino.fi directly with a Ledger hardware wallet could be considered the safest option, as both the trading key and your Ethereum key signing takes place on

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