Re: Blockchain.info - Bitcoin Block explorer & Currency Statistics
I'm happy you like the idea 
People will know that tags can be bought easily. Show how much was paid for each of them.
Scammers will get scam-warning-tags just underneath and you get money for that.
You could distribute the money paid for tags against your TOS to those that tagged the tag as scam.
If you charge a minimum fee for tagging, you can afford to moderate the tags.
If patrolling/taking responsibility for tags is not what you want to do, I suggest you do as follows:
Provide a tool to efficiently embed messages in the blockchain in combination with a payment to one of your addresses.
Provide a site that lists all these comments.
People will know that tags can be bought easily. Show how much was paid for each of them.
Scammers will get scam-warning-tags just underneath and you get money for that.
You could distribute the money paid for tags against your TOS to those that tagged the tag as scam.
If you charge a minimum fee for tagging, you can afford to moderate the tags.
If patrolling/taking responsibility for tags is not what you want to do, I suggest you do as follows:
Provide a tool to efficiently embed messages in the blockchain in combination with a payment to one of your addresses.
Provide a site that lists all these comments.
What about this... The owner of a website puts a file on their website called bitcoin_tags.json or something like that. This would server a similar purpose to sitemap.xml but instead contains a number of bitcoin addresses and labels.
For example http://wikileaks.org/bitcoin_tags.json
{
"tags" : {
"address" : "1HB5XMLmzFVj8ALj6mfBsbifRoD4miY36v",
"tag" : "Donations",
"sig" : "signature of concatenated tag and domain"
}
}
Once the owner of a website has added the file they can suggest that blockchain.info indexes it, once indexed blockchain.info will display the new tag accordingly. This has the advantage of.
* maintainable, webmaster can update bitcoin_tags.json as they choose. Deadlinks will be removed from the database.
* Decentralised, any service can index tags.
* More secure, both the domain and the address signature is verified. Tags can be independently verified if necessary and little moderation is needed.
Not sure if I'm following you. http://fluxcards.de/bitcoin_tags.json now holds a signature of "http://fluxcards.de/testing tags" signed with the address in question.
I do agree this is a very safe way to get people identify their own addresses but my original idea was to have a way to also tag other addresses. Scammers will not give their own addresses a scammer tag. Many very public addresses scream to get indexed somehow but their owners won't host such a file. Yet I'm sure people would pay to enter addresses in some index.
I'm thinking about doing it myself but blockchain.info already has most things in place needed to implement such an index and it would definitely drive traffic to your site if the bitcoins paid to tag stuff is not enough of an incentive.