Hi bitcoiners,

Some days ago i asked a "famous bitcoin guy" a question, he answered so i donated him a small bitcoin amount.
To recognize my donation i send him the link of the transaction id on blockchain but i realized that this method was not enough to grant that i make the donation.
The "famous bitcoin guy" believed me but i start thinking that anonymous address are ok in many situation but a simple way to associate identity to a bitcoin address could be useful in some situation and currently i don't know if something like that exist.

Technically could work as an HTTP services like that:

GET http://address-identity-url/{bitcoin address}
return 404 not found or a custom string that could be the real name of the {bitcoin address} owner

POST http://address-identity-url/{bitcoin address}
write the custom string at that URL, to be succesfull you need to provide an header with the signature generated by the private key of the {bitcoin address}

This way, only the owner of the {bitcoin address} could post on http://address-identity-url/{bitcoin address}

Before start implementing i would like opinion about this service.
Currently, are there other way for optionally associating identity to a bitcoin address?
Are there simple way to sign generic data with bitcoin wallet?
I think could be really useful, do you?