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Overview

Addresses are a fundamental part of interacting with Quai Network. They represent the global identity of Externally Owned Accounts (accounts backed by a private key), contracts, and UTXO wallets. These functions help convert between various formats, validate addresses across the Quai and Qi address spaces, and other utilities for working with addresses. The Quais SDK supports the following address formats:
  • Quai addresses: Account ledger addresses
  • Qi addresses: UTXO ledger addresses
Quai and Qi addresses utilize a sharded address space to allow nodes and wallets to quickly identify which chain and ledger an address resides on. The first 9 bits of every address is the binary identification prefix, of which the first 8 bits are the chain identifiers, and the last bit is the ledger identifier.
bits 0-3bits 4-7bit 8
region numberzone numberledger identifier
The following addresses are examples to illustrate how the binary identification prefixes work in practice.
AddressRegionZoneLedger
0x000DEADBEEFCAFE0000000000000000000000000region-0zone-0Quai
0x2A40000DEADBEEFCAFE000000000000000000000region-2zone-10Quai
0xFF700000000DEADBEEFCAFE00000000000000000region-15zone-15Quai
0x008000000000000DEADBEEFCAFE0000000000000region-0zone-0Qi
0xF3F0000000000000000DEADBEEFCAFE000000000region-15zone-3Qi

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Usage

Most commonly, the provided address utilities are used to validate addresses in the Quai and Qi address spaces.

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Validate a Quai address

To validate a Quai address, you can use the isQuaiAddress function, which returns true if the address is in the Quai ledger scope, and false otherwise. 
import { isQuaiAddress } from 'quais'

const address = '0x8ba1f109551bD432803012645Ac136ddd64DBA72'

if (isQuaiAddress(address)) {
	console.log('This is a valid Quai address')
} else {
	console.log('This is not a valid Quai address')
}

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Validate a Qi address

In the case of Qi addresses, you can use the isQiAddress function, which returns true if the address is in the Qi ledger scope, and false otherwise. 
import { isQiAddress } from 'quais'

const address = '0x8ba1f109551bD432803012645Ac136ddd64DBA72'

if (isQiAddress(address)) {
	console.log('This is a valid Qi address')
} else {
	console.log('This is not a valid Qi address')
}