The number of bitcoin scams has been rapidly rising. Many of them ask people to send bitcoin to the addresses they provide, such as bitcoin giveaway scams that promise to double the amount of bitcoin you send. The great Twitter hack last week, for example, had many high-profile accounts tweet about fake bitcoin giveaways.

Before sending your bitcoin to an address, you can check to see if that address has been reported as one being used in a scam. Bitcoin Abuse is a popular website with a public database of bitcoin addresses used by hackers and criminals. You can look up a bitcoin address, report a scam address, and monitor addresses reported by others.