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Address

In Orbs, addresses are represented in hex values, and is the 20 least significant bytes of the Sha256 digest of the public key.

For example, the below is a valid address:

0x4Bb4A3DA564983a3430602a7Bc2e82A8D012A875

Addresses or 'accounts' do not need to be created - the address is a simplified representation of the public key which is derived off the private key used to operate with the blockchain

The Orbs Contract SDK offers an API for working with address, in order to use it you need to import the address as such:

import (
    "github.com/orbs-network/orbs-contract-sdk/go/sdk/v1/address"
)

Checksum

Addresses are case sensitive, similarly to ethereum, the checksum is calculated according to the address in its case sensitive format and thus it is always recommended to use the address in that way. since everything is hex encoded, the underlying data does not change between the case status, meaning that an all lower-case, all upper-case and case-specific address of same letters, represent the same account, however the checksum can only be calculated correctly if the case sensitivity version of the address is presented

// three addresses which are the same
0x4bb4a3da564983a3430602a7bc2e82a8d012a875
0X4BB4A3DA564983A3430602A7BC2E82A8D012A875
0x4Bb4A3DA564983a3430602a7Bc2e82A8D012A875 // this one is the correct case representation where a checksum can be validated

Having the ability to validate the checksum helps us make sure that in cases where human errors (typos) are made when inputting an address, we can alert and possibly reject the transaction (depending on the selected logic)

Signer and caller

In Orbs there are two terms around well-known address during runtime, which are the Signer address and the Caller address.

The Signer address is the address of the account which is signing the transaction, in an ERC20 scenario for example, we will use that account to sign the transaction and transfer funds to/from it, depending on the operation.

The Caller address is the address of the entity that called the current function - while it may be the same as the signer address for simple scenarios, it can also be different, for example in the case where the contract calls a different contract

In the image above, the User calls contract one, at this stage:

  • Signer: User
  • Caller: User

Next, the logic of Contract1 will call Contract2, and at this stage when executing Contract2:

  • Signer: User
  • Caller: Contract1

Address API

There is no Address native type, and addresses are referred to as []byte internally in the code. This is why it is important to perform data validation to ensure that indeed the data in the []byte matches a valid address format.

ValidateAddress

The API call ValidateAddress exists for that and can be used as such:

ValidateAddress(address []byte)

As part of a code:

func transfer(amount uint64, targetAddress []byte) {
	...
	// recipient
	address.ValidateAddress(targetAddress)
	...
}

If the validation fails, the execution will return an error, so there is no return value from this validation function

GetSignerAddress

In any function, calling GetSignerAddress will return the []byte representation of the signer address

GetSignerAddress() []byte

GetCallerAddress

In any function, calling GetCallerAddress will return the []byte representation of the caller address

GetCallerAddress() []byte

GetOwnAddress

In any function, calling GetOwnAddress will return the []byte representation of the currently executing contract address

GetOwnAddress() []byte

GetContractAddress

In any function, calling GetContractAddress will return the []byte representation of the a specific contract address as specified in the argument

GetContractAddress(contractName string) []byte
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