Someone hands you a group photo and asks if they can post it...

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Someone hands you a group photo and asks if they can post it. You are in the back row. You probably say yes without thinking, because it is only a photo and you have nothing to hide. But that answer covered eight other people standing next to you, and nobody asked them.
Payments work the same way, and we rarely talk about them that way.
A payment record is a line that says who paid, who got paid, and how much. Some systems keep that line private between the two parties and their bank. Others publish it, which means anyone with a web browser can look it up, forever. When the line is public it describes both people on it.
So when someone tells me they have nothing to hide, I believe them. They are also speaking for whoever was on the other end.
Think about who that is. The plumber who fixed your sink now has his weekly income visible to anyone who followed you. The corner shop you buy from every Friday just showed a competitor how often people walk in. The friend you sent money to during a bad month never signed up to have that month on the record.
Now the other side, and it deserves real weight. Open records catch fraud. Auditors can check them without asking anyone's permission, and that is a solid reason people trust a system they cannot see inside. Most of your payments go to businesses that report their revenue anyway. Privacy tools do help criminals, and I am not going to wave that away. "Nothing to hide" has won most of the policy arguments of the last twenty years, and it did not win them by accident.
What would change my mind: a large payment network where every record is public by default, and five years on, ordinary users and the people they paid report no harm they can trace back to what the record showed. If that lands, I will drop this.
Bitcoin has not solved it either. Its record is public by design, and reusing the same receiving address, the string people send coins to, ties your history to the person you paid. That is a real cost and worth saying out loud instead of defending.
The person on the other end of your last payment never agreed to any of this. 
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"content": "Someone hands you a group photo and asks if they can post it. You are in the back row. You probably say yes without thinking, because it is only a photo and you have nothing to hide. But that answer covered eight other people standing next to you, and nobody asked them.\n\nPayments work the same way, and we rarely talk about them that way.\n\nA payment record is a line that says who paid, who got paid, and how much. Some systems keep that line private between the two parties and their bank. Others publish it, which means anyone with a web browser can look it up, forever. When the line is public it describes both people on it.\n\nSo when someone tells me they have nothing to hide, I believe them. They are also speaking for whoever was on the other end.\n\nThink about who that is. The plumber who fixed your sink now has his weekly income visible to anyone who followed you. The corner shop you buy from every Friday just showed a competitor how often people walk in. The friend you sent money to during a bad month never signed up to have that month on the record.\n\nNow the other side, and it deserves real weight. Open records catch fraud. Auditors can check them without asking anyone's permission, and that is a solid reason people trust a system they cannot see inside. Most of your payments go to businesses that report their revenue anyway. Privacy tools do help criminals, and I am not going to wave that away. \"Nothing to hide\" has won most of the policy arguments of the last twenty years, and it did not win them by accident.\n\nWhat would change my mind: a large payment network where every record is public by default, and five years on, ordinary users and the people they paid report no harm they can trace back to what the record showed. If that lands, I will drop this.\n\nBitcoin has not solved it either. Its record is public by design, and reusing the same receiving address, the string people send coins to, ties your history to the person you paid. That is a real cost and worth saying out loud instead of defending.\n\nThe person on the other end of your last payment never agreed to any of this. https://blossom.primal.net/f4292d00571d55184b75281206cfc48daf3eaff6a4d0f7a922ae23c0146da284.jpg ",
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