In brief
- A searchable database built from New York City's public property records has sparked backlash.
- Crypto executives say organizing public records into a searchable tool increases security risks.
- Critics point to a rise in violent attacks targeting cryptocurrency holders.
A searchable database built from New York City's public property assessment records is drawing backlash from prominent figures in the crypto industry, who argue that making the information easier to search effectively creates a directory of wealthy property owners and could expose them to physical danger.
The controversy centers on data published by the New York City Department of Finance, which annually releases assessed values used to calculate property taxes for every property in the city. The agency's FY2027 assessment roll, supplemental market value data, and property tax guides are publicly available through the city's Open Data portal.
Critics on X said the issue is not that the records are public, but that they have been aggregated and organized into a searchable database that makes identifying owners of expensive properties far easier.
Uniswap founder Hayden Adams called it "the worst mass doxxing I've ever seen," saying the database listed nearly every unit in some luxury apartment buildings, including primary residences of people he knows. He argued the project cast too wide a net and called it "incredibly dangerous."
“Not only were their units listed, but nearly every unit in the entire building was listed,” Adams wrote. “They clearly took an incredibly expansive view of 'could be' and just doxxed a huge percentage of all expensive apartments in New York City.”
The city published a list of all properties -- and the names of the owners -- that *could be* subject to the new pied a terre tax in a very easy to search Excel sheet: https://t.co/d3iAikgERk https://t.co/cRjMmprBob
— Bernadette Hogan (@bern_hogan) July 24, 2026
Helius CEO Mert Mumtaz called the database “unsettling” and said it crossed a line by transforming scattered public records into a centralized resource that effectively singled out wealthy individuals.
“While this data was largely public prior to this in a messy way they have cleaned it, organized it, singled out 'the rich,’ and mass distributed it only the 50th sign this year of privacy continuing to become scarcer,” he wrote.
Castle Island Ventures partner Nic Carter warned that an easily searchable database of affluent property owners could make potential victims easier to identify, pointing to recent crypto-related kidnappings and violent attacks in Europe.
“So this is a list of wealthy people and their addresses. As we’ve seen in France and Sweden this leads to crypto kidnappings, torturings and murders,” Carter wrote on X. “Yes real estate records are semi public but this is an easily searchable database and target list.”
The criticism comes as physical or “wrench” attacks targeting cryptocurrency holders continue to rise, with incidents including kidnappings, torture, home invasions, and sexual assaults.
In February, blockchain security firm CertiK reported 72 verified crypto "wrench attacks" worldwide in 2025, up 75% from the previous year and resulting in more than $40.9 million in losses.
In April, French authorities charged 88 suspects, including more than 10 minors, in a sweeping crackdown on violent crypto kidnappings. In May, U.S. prosecutors indicted three men accused of carrying out a series of armed home invasions across California that allegedly stole millions of dollars in cryptocurrency. In June, two Texas brothers pleaded guilty to kidnapping a Minnesota family and forcing the victims to transfer more than $8 million in crypto.
By July, CertiK said attackers had already carried out 52 verified crypto "wrench attacks" in the first half of 2026, with recorded financial exposure surging nearly twelvefold year over year to $124 million.
Facts Only
* A searchable database was built from New York City's public property assessment records.
* The data originates from the New York City Department of Finance, which releases assessed values and market value data.
* This information is publicly available through the city's Open Data portal.
* Uniswap founder Hayden Adams stated the database listed nearly every unit in some luxury apartment buildings.
* Helius CEO Mert Mumtaz called the database unsettling, noting it centralized public records to single out wealthy individuals.
* Castle Island Ventures partner Nic Carter warned that an easily searchable database of affluent property owners could make victims easier to identify, referencing crypto-related kidnappings in France and Sweden.
* Blockchain security firm CertiK reported 72 verified crypto "wrench attacks" worldwide in 2025.
* In 2026, CertiK recorded 52 verified crypto "wrench attacks" in the first half of the year.
* U.S. prosecutors indicted men accused of armed home invasions targeting cryptocurrency in California.
Executive Summary
A searchable database compiled from New York City's public property assessment records has generated significant backlash from cryptocurrency executives who contend that organizing this public data into a searchable format creates security risks by exposing wealthy property owners to danger. The controversy stems from the availability of publicly released property tax and market value data from the New York City Department of Finance, which is now organized and made easily searchable via an Open Data portal.
Key figures in the crypto industry, including Uniswap founder Hayden Adams and Helius CEO Mert Mumtaz, criticized the action, arguing that aggregating scattered public records into a centralized tool functions as mass doxxing by clearly identifying owners of expensive properties. This concern is amplified by warnings from entities like Castle Island Ventures, which linked the database to real-world threats, citing documented cases of violent attacks and kidnappings targeting cryptocurrency holders in Europe.
The situation occurs amidst a rising trend of physical attacks against crypto holders, evidenced by recent reports of "wrench attacks" and violent incidents involving kidnappings across various jurisdictions. Critics assert that transforming semi-public property information into an easily searchable list of affluent residents creates a potential vulnerability for these targeted individuals.
Full Take
The narrative juxtaposes the public availability of official municipal data against the security implications of its aggregation and dissemination, creating a tension between transparency and personal safety. The core conflict lies not in the existence of public records, but in the mechanism of organization; transforming passive data into an active, searchable threat list changes the nature of privacy exposure. This mirrors a broader concern about how digital information, even when ostensibly public, can be weaponized through algorithmic aggregation to facilitate real-world harm.
The pattern suggests that convenience and transparency, when applied to sensitive demographic data (wealth and location), risk creating exploitable targets for malicious actors operating in the physical domain. The connection drawn between property records and kidnapping/attack statistics functions as a leap from abstract data analysis to concrete security threat assessment.
The underlying implication is a challenge to the utility of public data governance: if public records are easily searchable, the responsibility shifts to managing the context and application of that searchability. A critical question emerges regarding who bears the cost—the entities releasing the data, the platform organizing it, or the individuals whose privacy is compromised by the resulting list. What are the mechanisms for establishing a firewall between economic transparency and physical vulnerability?
Sentinel — Human
The text effectively synthesizes public data and high-profile expert/activist concerns to build an urgent narrative about privacy and physical risk, exhibiting strong journalistic synthesis rather than pure LLM generation.