Earlier quoted context omitted.
Bounties for citizenly public actions. But how do you prove it’s you? Maybe book a time slot. If the light disappears in this time slot, you get the bounty.
Spraypaint a private key (or any unique symbol, really) to prove you did it.
1. Person wanting defacement would indicate the amount for the bounty, along with the message to be posted on the defaced property
2. Vandal contacts payer and agrees to conditions. He/she also gives the client their public key
3. Vandal performs defacement, then add the specified message to it, encrypted in his or her private key
4. Vandal notifies the person paying the bounty that the job is complete, sending him/her a picture of the defacement with encrypted message
4. Payer decrypts message, verifies it matches, then pays out the agreed upon bounty to the vandal