Top-Level Domain Registrar

The registrar smart contract is responsible for managing the top-level domains. It sells second-level domains to buyers and allows renewals.

Open Auction

At service launch, every domain is offered to users through auction first. The registrar implements an open ascending price auction model. It is an auction model most people are likely familiar with: all bids are openly visible and every new bid is required to be higher than the last bid. If there are no bids in a given period since the last bid, the auction ends with the highest bidder winning the auction.


Any account can submit a bid during an active auction and transfer associated funds along in the same transaction. If a bid is higher or equal to the current highest bid multiplied by (100% + min_bid_increase_ratio%), it becomes the new highest bid and the previous highest bid becomes refundable or available for future bids (on the same or a different domain). Otherwise, the transaction fails. The auction ends after bid_additional_period seconds since the last bid, but not earlier than min_auction_period since the auction's start.

A special case is the first bid, which has to be greater or equal to standard_price_per_day. When a previously unregistered domain name is first bid on, the name is pre-registered in the name registry to ensure its validity.


After the auction ends, there is a settlement period of the same length as min_duration. The highest bidder invokes the settlement process transferring the domain to a chosen address, which becomes the new owner. The domain is registered for the min_duration (the time spent in the settlement period counts towards that period). If the highest bidder doesn't invoke settlement, the domain is treated as expired after the settlement phase ends.

First-In First-Served Registration

An expired domain becomes available for FIFS only after its auction ended with no bids. In the FIFS model, all domains are sold for a flat fee equal to the standard_price_per_day. In the period after the launch of the smart contract, all domains are treated as recently expired.

For FIFS registration, the contract implements a commit & reveal scheme to avoid front-running of transactions.


Owners of domains can renew their domains at any time up until the domain expires. The chosen renewal period has to be greater or equal to min_duration. Renewals are priced using standard_price_per_day.


Proceeds from Tezos Domains registrations and auctions are currently being accumulated in the smart contract. Only the administrative multisig can transfer funds stored in the contract. To learn more about the future plans for Tezos Domains proceeds, please visit our website.

Top-level Domain List

The susceptibility to spoofing attacks using look-alike characters is reduced by limiting TLDs to predefined character scripts. Neither whole-script and mixed-script confusable names can be created under one TLD.

The top-level domains available are:




The standard TLD for names in Latin

TLDs for more character scripts will be likely made available in the future.


There are several numeric parameters stored to configure this contract in the config bigmap. The keys of the bigmap following:

  • 0 = max_commitment_age is the maximum time for a buy commitment to be valid (in seconds)

  • 1 = min_commitment_age is the minimum time for a buy commitment to be valid (in seconds)

  • 2 = standard_price_per_day is the standard FIFS price for a day and the minimum amount that participants have to bid initially in auction (in picotezos = 1e-12 tez)

  • 3 = min_duration is the minimum period anyone can register or renew a domain for (in seconds)

  • 4 = min_bid_increase_ratio is the minimum ratio of a new bid to the current highest bid (in percent)

  • 5 = min_auction_period is the minimum auction period (in seconds)

  • 6 = bid_additional_period is the period after which the auction ends measured since the last successful bid (in seconds)

  • 1000 = launch_date is the start of the initial auction period for all domains, i.e., the date the service was officially launched (in second since epoch). The value of 0 means no launch has been configured

    • 1000 + label_length is the override of the launch date for all labels that are label_length characters long