> For the complete documentation index, see [llms.txt](https://developers.tezos.domains/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.tezos.domains/interoperability/buys-and-renewals.md). # Buys & Renewals ### Contract: TLDRegistrar.Commit Creates a commitment to buy a second-level domain without disclosing the actual name. This is implemented according to our [commit\&reveal](https://en.wikipedia.org/wiki/Commitment_scheme) scheme. **Entrypoint**: `commit` | Parameter Type | Description | | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `bytes` | SHA-512 hash of a packed tuple of **label**, **owner**, and a **random nonce** corresponding to the intended buy (see [TLDRegistrar.Buy](/interoperability/buys-and-renewals.md#contract-tldregistrar-buy)). The hashed tuple is of the Michelson type`pair (pair bytes address) nat`. Having a random nonce prevents susceptibility to dictionary attacks. | {% tabs %} {% tab title="CamelLIGO" %} ```ocaml type commit_param = bytes | Commit of bytes ``` {% endtab %} {% tab title="Michelson" %} ``` parameter (or (bytes %commit) # ... more entrypoints outside of this interoperability spec ); ``` {% endtab %} {% endtabs %} | Error | Description | | ------------------ | ------------------------------------------------------------------------------- | | AMOUNT\_NOT\_ZERO | The transferred **amount** of *tez* is not zero. | | COMMITMENT\_EXISTS | The given commitment exists. A commitment with a new nonce has to be generated. | ### Contract: TLDRegistrar.Buy Buys a second-level domain based on previous commitment (see [TLDRegistrar.Commit](/interoperability/buys-and-renewals.md#contract-tldregistrar-commit)). **Entrypoint**: `buy` **Amount restriction**: The amount sent with this call has to be equal to the price of the domain. The price in mutez is calculated as `standard_price_per_day * duration / 1000000`. | Parameter | Type | Description | | ------------ | --------------------- | ------------------------------------------------------------------------- | | **label** | `bytes` | The UTF-8 encoded label of the second-level domain to buy. | | **duration** | `nat` | Ownership duration represented in days. | | **owner** | `address` | The new owner of the given domain. | | **address** | `address option` | The optional address the given domain resolves to. | | **data** | `(string, bytes) map` | A map of any additional data clients wish to store with the given domain. | | **nonce** | `nat` | The chosen commitment nonce. | {% tabs %} {% tab title="CamelLIGO" %} ```ocaml type buy_param = { label: bytes; duration: nat; owner: address; address: address option; data: (string, bytes) map; nonce: nat; } | Buy of buy_param michelson_pair_left_comb ``` {% endtab %} {% tab title="Michelson" %} ``` parameter (or (pair %buy (bytes %label) (pair (nat %duration) (pair (address %owner) (pair (option %address address) (pair (map %data string bytes) (nat %nonce)))))) # ... more entrypoints outside of this interoperability spec ); ``` {% endtab %} {% endtabs %} | Error | Description | | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- | | COMMITMENT\_DOES\_NOT\_EXIST | Corresponding commitment (see [TLDRegistrar.Commit](/interoperability/buys-and-renewals.md#contract-tldregistrar-commit)) was not created before. | | COMMITMENT\_TOO\_OLD | The commitment is too old (older than configured age). Try recreating it again. | | COMMITMENT\_TOO\_RECENT | The commitment is too recent (younger than configured age). Wait for some time. | | LABEL\_TAKEN | The requested **label** already exists and it is not expired. | | LABEL\_NOT\_AVAILABLE | The requested **label** is currently not available for registration. | | LABEL\_IN\_AUCTION | The requested **label** is currently only available in auction. | | INVALID\_LABEL | The given **label** is not valid. See [Label Validation](/interoperability/domain-operations.md#label-validation). | | LABEL\_EMPTY | The given label is empty. | | LABEL\_TOO\_LONG | The label is too long. | | NAME\_TOO\_LONG | The name (label + parent) is too long. | | DURATION\_TOO\_LOW | The requested **duration** is too low (lower than the configured minimum). | | AMOUNT\_TOO\_LOW | The transferred **amount** is lower than the actual price. | | AMOUNT\_TOO\_HIGH | The transferred **amount** is higher than the actual price. | ### Contract: TLDRegistrar.Renew Renews second-level domain for requested duration. **Entrypoint**: `renew` **Amount restriction**: The amount sent with this call has to be equal to the price of the domain. The price in mutez is calculated as `standard_price_per_day * duration / 1000000`. | Parameter | Type | Description | | ------------ | ------- | ---------------------------------------------------------- | | **label** | `bytes` | The UTF-8 encoded label of the second-level domain to buy. | | **duration** | `nat` | The renewal duration represented in days. | {% tabs %} {% tab title="CamelLIGO" %} ```ocaml type renew_param = { label: bytes; duration: nat; } | Renew of renew_param michelson_pair_left_comb ``` {% endtab %} {% tab title="Michelson" %} ``` parameter (or (pair %renew (bytes %label) (nat %duration)) # ... more entrypoints outside of this interoperability spec ); ``` {% endtab %} {% endtabs %} | Error | Description | | ------------------ | ------------------------------------------------------------------------------------------ | | LABEL\_NOT\_FOUND | The requested **label** does not exist. | | LABEL\_EXPIRED | The requested **label** exists but it is expired. Therefore it can be bought, not renewed. | | DURATION\_TOO\_LOW | The specified **duration** is too low (lower than the configured minimum). | | AMOUNT\_TOO\_LOW | The transferred **amount** is lower than the actual price. | | AMOUNT\_TOO\_HIGH | The transferred **amount** is higher than the actual price. | --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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