EAS Schema

Location Proof Protocol: Core Schema v0.1

Deployments

The core layer of the Location Proof Protocol includes a standard data model. v0.1 of the data model is described in this document. The current working schema is deployed on:

• Arbitrum One mainnet, Schema 228 / UID 0xba4171c92572b1e4f241d044c32cdf083be9fd946b8766977558ca6378c824e2 (view on Arbitrum EASScan).
• Celo Mainnet, Schema 59 / UID 0xba4171c92572b1e4f241d044c32cdf083be9fd946b8766977558ca6378c824e2 (view on Celo EASScan).
• Ethereum Sepolia testnet, Schema 2266 / UID 0xba4171c92572b1e4f241d044c32cdf083be9fd946b8766977558ca6378c824e2 (view on Sepolia EASScan).

Schema Details

Field	Description	Key	Data Type	Source
Identifier	Unique ID for the location proof.	uid	bytes32	EAS provides this
Prover Address	Address of the prover.	from	address	Sender address, as specified by EAS
Subject Identifier	Unique ID for the subject/event.	subject	address	EAS provides this, however future iterations may require IDs that are not Ethereum addresses (DIDs, for example)
Timestamp	Time the location proof was created.	timestamp	uint256	EAS
Event Timestamp	Time of the event referenced by the location proof.	eventTimestamp	uint256	User input
Spatial Reference System	Coordinate system within which the object is positioned.	srs	string	in v0.1, hard coded to "EPSG:4326"
Location Type	A string defining how the location field is structured.	locationType	string	Depends on the recipe / strategy, or user input
Location	The location of the object/event.	location	string	Depends on the recipe / strategy, or user input
Proof Recipe Identifier	Indicates the proof recipe used.	recipeType	string[]	Defined from a set of registered recipes, to be stored in the @/recipes directory
Proof Recipe Payload	Encoded data specific to the proof recipe, which could include encrypted location data, a zero-knowledge proof, or references to other verification data.	recipePayload	bytes[]	Specified in recipe definition
Media Type	A unique string referring to the media to be included in a bytes field, Media Data. This pattern is similar to OpenGraph Protocol’s type definition.	mediaType	string[]	Defined from a set of supported media types, to be stored in the @/media directory
Media Data	A string field allowing the attachment of arbitrary data to a location proof, referenced by CID. This data is intended to be irrelevant to the location proof and not required/utilized in the proof recipe verification.	mediaData	string[]	Attached by user
Memo	An arbitrary message	memo	string	User input

Raw schema:

uint256 eventTimestamp,string srs,string locationType,string location,string[] recipeType,bytes[] recipePayload,string[] mediaType,string[] mediaData,string memo

Note that this design supports location proofs that include multiple recipe types / recipe payloads and media type / media data.