PublicResolver
The default public resolver.
Last updated
The default public resolver.
Last updated
PublicResolver implements a general-purpose LNS resolver that is suitable for most standard LNS use-cases. The public resolver permits updates to LNS records by the owner of the corresponding name.
The public resolver implements the following EIPs:
- Contract address interface (addr()
).
- Interface Detection (supportsInterface()
).
- Reverse resolution (name()
).
- ABI support (ABI()
).
- SECP256k1 public keys (pubkey()
).
- Text records (text()
).
- Content hash support (contenthash()
).
- Multicoin support (addr()
).
While the PublicResolver
provides a convenient default implementation, many resolver implementations and versions exist. Callers must not assume that a domain uses the current version of the public resolver, or that all of the methods described here are present. To check if a resolver supports a feature, see .
LNS uses for interface detection. ERC 165 requires that supporting contracts implement a function, supportsInterface
, which takes an interface ID and returns a boolean value indicating if this interface is supported or not.
Interface IDs are calculated as the exclusive-or of the four-byte function identifiers of each function included in the interface. For example, addr(bytes32)
has the function ID 0x3b3b57de. Because it is the only function in the smartBCH Address interface, its interface ID is also 0x3b3b57de, and so calling supportsInterface(0x3b3b57de)
will return true for any resolver that supports addr()
.
ERC 165 has an interface ID of 0x01ffc9a7, so supportsInterface(0x01ffc9a7)
will always return true for any ERC 165 supporting contract (and hence for any resolver).
Note that the public resolver does not expose explicit interfaces for setter functions, so there are no automated means to check for support for a given setter function.
Returns the smartBCH address associated with the provided node
, or 0 if none.
This function has interface ID 0x3b3b57de.
Sets the smartBCH address associated with the provided node
to addr
.
Only callable by the owner of node
.
Emits the following event:
Returns the Blockchain address associated with the provided node
and coinType
, or 0 if none.
This function has interface ID 0xf1cb7e06.
The return value is the cryptocurrency address in its native binary format and each blockchain address has a different encoding and decoding method.
For example, the Bitcoin address 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa
base58check decodes to the 21 bytes 0062e907b15cbf27d5425399ebf6f0fb50ebb88f18
then scriptPubkey encodes to 25 bytes 76a91462e907b15cbf27d5425399ebf6f0fb50ebb88f1888ac
whereas the BNB address bnb1grpf0955h0ykzq3ar5nmum7y6gdfl6lxfn46h2
Bech32 decodes to the binary representation 40c2979694bbc961023d1d27be6fc4d21a9febe6
.
A zero-length string will be returned if the specified coin ID does not exist on the specified node.
Sets the blockchain address associated with the provided node
and coinType
to addr
.
Only callable by the owner of node
.
Emits the following event:
Returns the canonical LNS name associated with the provided node
. Used exclusively for reverse resolution.
This function has interface ID 0x691f3431.
Sets the canonical LNS name for the provided node
to name
.
Only callable by the owner of node
.
Emits the following event:
contenthash
is used to store IPFS and Swarm content hashes, which permit resolving LNS addresses to distributed content (eg, websites) hosted on these distributed networks.
This function has interface ID 0xbc1c58d1.
Sets the content hash for the provided node
to hash
.
Only callable by the owner of node
.
Emits the following event:
Returns a matching ABI definition for the provided node
, if one exists. contentTypes
is the bitwise-OR of the encodings that the caller can accept. If multiple content types are specified, the resolver will select one to return. Currently supported content types are:
1
JSON
2
zlib-compressed JSON
4
8
URI
ABI
returns a two-tuple of the content type ID and the ABI data. If no data of the appropriate content type ID was found, 0 is returned for the content type ID, and the ABI data will be the empty string.
This function has interface ID 0x2203ab56.
Only callable by the owner of node
.
Emits the following event:
Returns the ECDSA SECP256k1 public key for node
, as a 2-tuple (x, y)
. If no public key is set, (0, 0)
is returned.
This function has interface ID 0xc8690233.
Sets the ECDSA SECP256k1 public key for node
to (x, y)
.
Only callable by the owner of node
.
Emits the following event:
Retrieves text metadata for node
. Each name may have multiple pieces of metadata, identified by a unique string key
. If no text data exists for node
with the key key
, the empty string is returned.
Standard values for key
are:
An email address
url
A URL
avatar
A URL to an image used as an avatar or logo
description
A description of the name
notice
A notice regarding this name
keywords
A list of comma-separated keywords, ordered by most significant first; clients that interpresent this field may choose a threshold beyond which to ignore
In addition, anyone may specify vendor-specific keys, which must be prefixed with vnd.
. The following vendor-specific keys are currently known:
com.twitter
Twitter handle
com.github
Github username
This function has interface ID 0x59d1d43c.
Sets text metadata for node
with the unique key key
to value
, overwriting anything previously stored for node
and key
. To clear a text field, set it to the empty string.
Only callable by the owner of node
.
Emits the following event:
Permits users to set multiple records in a single operation.
Use encodeABI
function to encode your contract calls and pass it to data
.
The frontend usage will be as follows:
This function is specified in .
This function is specified in .
To convert the binary representation into the address, use formatsByCoinType[SYMBOL].encoder(binary)
of .
coinType
is the cryptocurrency coin type index from .
To convert the address into the binary representation, use formatsByName[SYMBOL].decoder(text)
of
This function is specified in .
Returns the content hash for node
, if one exists. Values are formatted as machine-readable , as specified in .
This function is specified in .
Values are formatted as machine-readable , as specified in .
This function is specified in .
Sets or updates ABI data for node
. contentType
specifies the content type ID (see for valid values); exactly one type ID must be specified. data
contains the encoded ABI data. To clear ABI data for a name, specify the empty string for data
.
This function is specified in .
This function is specified in .