This is a thought about Railway wallet, privacy Defi Wallet with ZKproof on Ethereum, BNB, Polygon and Arbitrum.
Firstly, in conclusion, it is only private when transfer between 0zk address. The security of 0zk network is the concern as no one knows if it is hacked because it is private.
It is also tradable by checking the EVM 0x addresses associated with railgun contract.
Website
https://railgun.org/
Wallet
https://www.railway.xyz/
Briefly about this is make a EVM wallet and ZK proof wallet (0x and ozk wallet which are connected as public and private), toggle between them with shield/unshield. The shielded token is not shown on explores which is on ozk address.
Here is the full guide.
https://help.railway.xyz/
This is what the wallet it looks like.
Transactions can be seen to get to the destination of EVM address (with ZKproof address). Now the token will be shielded to be private and it goes to 0zk address.
Therefore the TX between 0zk is private.
This is the transaction of unshield to another wallet.
You can see on the explore that it goes through this contract.
https://polygonscan.com/address/0xc7ffa542736321a3dd69246d73987566a5486968
and can see it is from railgun.
And this is the sender address.
https://polygonscan.com/address/0x069eca7911c2ed34dcdaf999c44cf3cfe0610bc0
So it can be detected that transfer from this address is from railgun.
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