An ethereum address ownership verification smart contract

Think SMS cell phone number verification for ethereum addresses.

Possible use cases:

Exchanges could use this contract to verify their user's withdrawal addresses before sending them crypto currencies.

This could remove a possible user error from the withdrawal processes.

Requirements

• truffle v3.0.2 or higher
• testrpc must be running for local testing

Online demo

:TODO:

Local installation

git clone https://github.com/smoove/AddressOwnershipVerification.git
cd AddressOwnershipVerification
npm install
truffle compile
truffle migrate # make sure testrpc/geth/parity is running
npm run build
truffle serve

Then navigate to http://localhost:8080/ in your browser.

Usage

Definitions

address: An ethereum address

transactor: The party that wants to verify another parties ownership over address

transactee: The party that is asked to verify their ownership of address

deposit: A randomly generated number. It represents the amount of wei transactee has to send to verify ownership of address.

Suggested workflow

1. Transactor receives an address from transactee, who claims to own said address.
2. Transactor generates a random number, deposit. This can be anything greater than 0 up to uint32's max value (4294967295).
3. Transactor calls request(address, deposit)
4. Transactor tells transactee to send deposit amount of wei to this contract - Transactee could also listen for the RequestEvent event to get notified.
5. Transactee sends deposit amount of wei to this contract from address
6. Transactor listens for the TrustEvent event or gets informed by transactee that the deposit has been sent
7. Transactor can now call verify(transactor, address) to know wether or not transactee has fullfilled the request

optional:

• Transactor or transactee can call removeRequest(transactor, transactee) to cancel a pending request before it was verified. This triggers the RemoveRequestEvent event.
• Transactor or transactee can call revoke(transactor, transactee) to revoke the verification and return deposit to transactee. This triggers the RevokeEvent event.

Events

RequestEvent

event RequestEvent(address indexed transactor, address indexed transactee, uint32 indexed deposit);

Triggered when a new request is created.

RemoveRequestEvent

event RemoveRequestEvent(address indexed transactor, address indexed transactee);

Triggered when a pending request is removed by either party before it was verified.

VerificationEvent

event VerificationEvent(address indexed transactor, address indexed transactee, uint32 indexed deposit);

Triggered when a pending request is successfully verified.

RevokeEvent

event RevokeEvent(address indexed transactor, address indexed transactee, uint32 indexed deposit);

Triggered when either party revokes an existing verification.

Running tests

truffle test