This did:io format uniquely and immutably identifies a physical device in a decentralized manner.
DID Document
Each did:io identifier is associated with a DID Document, a JSON-LD metadata object stored securely on IPFS. The document describes key attributes of the device and its ownership.
It may include:
Public keys or verification methods
Authentication and authorization settings
Device owner or controller information
Associated services (e.g., data feeds, project memberships)
Machine-bound account (MBA) references
DID Doc Example (Without Public Key)
{
"@context": [
"https://www.w3.org/ns/did/v1",
"https://w3id.org/security/suites/ed25519-2020/v1" // Assuming a context for owner's potential signature or controller key
],
"id": "did:io:abcdef1234567890geodnet-serial-kitchen-temp-sensor", // Example did:io identifier
"controller": "did:ethr:0xOwnerWalletAddress", // Example: Controlled by the owner's Ethereum wallet DID
// Alternatively, this could be the project's DID.
"service": [
{
"id": "did:io:abcdef1234567890geodnet-serial-kitchen-temp-sensor#depin-project",
"type": "DePINProjectMembership",
"serviceEndpoint": "https://depinscan.io/projects/geodnet",
"projectName": "GEODNET", //
"deviceIdentity": "serial-kitchen-temp-sensor" //
},
{
"id": "did:io:abcdef1234567890geodnet-serial-kitchen-temp-sensor#owner",
"type": "DeviceOwner",
"serviceEndpoint": "https://depinscan.io/owner/0xOwnerWalletAddress" // Link to owner information if available publicly
}
],
"assertionMethod": [ // The owner/controller would make assertions on behalf of this DID
"did:ethr:0xOwnerWalletAddress#key-1"
],
"authentication": [ // The owner/controller authenticates on behalf of this DID
"did:ethr:0xOwnerWalletAddress#key-1"
]
}
DID Doc Example (With Public Key)
{
"@context": [
"https://www.w3.org/ns/did/v1",
"https://w3id.org/security/suites/ed25519-2020/v1" // Example context for Ed25519 keys
],
"id": "did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa", // Using example from PRD [cite: 47]
"verificationMethod": [
{
"id": "did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#keys-1",
"type": "Ed25519VerificationKey2020", // Type updated to a more current one if applicable
"controller": "did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa", // Device controls its own key
"publicKeyMultibase": "zH3C2AVvLMfThF3xGk8qEsvTZbW2nK7QULaFVpJ6zC1db" // publicKeyBase58 from PRD [cite: 60] example, converted to multibase format
}
],
"authentication": [
"did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#keys-1"
],
"assertionMethod": [
"did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#keys-1"
],
"capabilityInvocation": [ // Example: for invoking capabilities like signing transactions for its MBA
"did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#keys-1"
],
"capabilityDelegation": [ // Example: for delegating capabilities
"did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#keys-1"
],
"service": [
{
"id": "did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#mba",
"type": "MachineBoundAccount",
"serviceEndpoint": "erc6551:1/0xNFTContractAddress/TokenID_Corresponding_To_ioID" // Example URI to locate MBA info
},
{
"id": "did:io:5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa#depin-data",
"type": "DePINDataService",
"serviceEndpoint": "https://api.project.example/device/5RJ1UfUCLX68KeFMmuvaVsm6m5Y7yH1bkF5CC4WpHXxa/data"
}
]
}
Summary
did:io identifiers are globally unique, decentralized, and resolvable via IPFS-hosted DID Documents.
These documents define who controls a device, how it authenticates, and what services or projects it belongs to.
Public keys are optional but enable advanced use cases like self-sovereign devices or on-device signing.
