Blockstack is an open source initiative that implements a distributed global naming system on top of the bitcoin network. The system allows users to pseudonymously buy and own identifiers similar to the domain name system. While payment and proof of ownership is running on the public bitcoin blockchain the metadata for registered identities is managed on a separate distributed and open p2p network based on open source software developed by the blockstack community. Metadata is stored in full redundancy. The system is running as sidechain to the bitcoin livenet and already has about 69967 registered “domains” in their top level namespace “.id”.

Hands-On Evaluation

While there is a hosted web application with a graphical user interface at we chose to use the command line client to test the system without relying on a hosted website. From a programmer’s perspective the installation as documented on the project site was a very smooth experience without any hiccups. After installation you can instantly lookup names within the “.id” namespace. Before you can register a name you have to create a bitcoin address and send it some funds. Prices for name registration are dynamic and depend on the length of the registered domain and current bitcoin transaction fees. Estimated costs for a given name can be queried via command line:

At current rates, the registration fee for a 6 character name is at ~ $ 6.30. Our test registration went through without technical problems. The process was fully automated but took about 5 hours and created 3 transactions on the bitcoin blockchain. The details can be seen here:

Name registrations have an expiry that is given in terms of block height. Our test registration was registered at block 455211 and will expire at block 560401 if not updated. So our registration is valid for about 105190 bitcoin blocks at ~10 minutes each which adds up to 730 days (2 years).


While it was interesting to test and see how Blockstack solves the name registry problem, ultimately the concept of exclusive and “first come, first served” name ownership is too restricted to fit our broader needs. The costs for registering a name are too high for our intended use cases and are likely to increase with bitcoin’s popularity. So we did not proceed with a deeper testing of available metadata storage options.