Concordium Healthcare Blockchain: Privacy-First Smart Contract Architecture

Concordium Smart Contract Architecture

LED-UP's Concordium blockchain infrastructure leverages built-in identity verification and regulatory compliance to create a comprehensive healthcare data exchange ecosystem.

Rust-based Smart Contract Implementation

Rust-based smart contract managing medical record metadata with Concordium's built-in identity verification and regulatory compliance features.

use concordium_std::*;
use concordium_cis2::*;

#[derive(Serialize, SchemaType)]
struct MedicalRecord {
    record_id: u64,
    data_hash: Hash,              // IPFS hash for encrypted data
    patient_id: AccountAddress,   // Verified Concordium ID
    provider_id: AccountAddress,  // Healthcare provider ID
    timestamp: Timestamp,         // Creation timestamp
    record_type: RecordType,      // Type of medical data
    compensation_rate: Amount,    // Payment per access
    is_active: bool,             // Record availability
    consent_expires: Timestamp,   // GDPR compliance
}

#[derive(Serialize, SchemaType)]
enum RecordType {
    LabResult,
    ImagingStudy,
    Prescription,
    VitalSigns,
    Diagnosis,
}

#[derive(Serialize, SchemaType)]
struct State {
    records: BTreeMap,
    patient_records: BTreeMap>,
    provider_records: BTreeMap>,
    next_record_id: u64,
    admin: AccountAddress,
}

#[derive(Serialize, SchemaType)]
struct CreateRecordParams {
    data_hash: Hash,
    patient_id: AccountAddress,
    record_type: RecordType,
    compensation_rate: Amount,
    consent_duration: Duration,
}

/// Create a new medical record with Concordium ID verification
#[receive(
    contract = "healthcare_registry",
    name = "create_record",
    parameter = "CreateRecordParams",
    error = "ContractError",
    mutable
)]
fn create_record(
    ctx: &impl HasReceiveContext,
    host: &mut impl HasHost,
) -> ContractResult {
    let params: CreateRecordParams = ctx.parameter_cursor().get()?;
    let sender = ctx.sender();
    
    // Verify sender is authorized healthcare provider
    ensure!(host.state().provider_records.contains_key(&sender), ContractError::Unauthorized);
    
    // Verify patient identity through Concordium ID layer
    let patient_identity = host.identity_registry().get_identity(¶ms.patient_id)?;
    ensure!(patient_identity.is_verified(), ContractError::IdentityNotVerified);
    
    let mut state = host.state_mut();
    let record_id = state.next_record_id;
    state.next_record_id += 1;
    
    let record = MedicalRecord {
        record_id,
        data_hash: params.data_hash,
        patient_id: params.patient_id,
        provider_id: sender,
        timestamp: ctx.metadata().slot_time(),
        record_type: params.record_type,
        compensation_rate: params.compensation_rate,
        is_active: true,
        consent_expires: ctx.metadata().slot_time() + params.consent_duration,
    };
    
    // Store record and update indices
    state.records.insert(record_id, record);
    state.patient_records.entry(params.patient_id).or_insert_with(Vec::new).push(record_id);
    state.provider_records.entry(sender).or_insert_with(Vec::new).push(record_id);
    
    // Log event for audit trail
    logger.log(&Event::RecordCreated {
        record_id,
        patient_id: params.patient_id,
        provider_id: sender,
        data_hash: params.data_hash,
    })?;
    
    Ok(record_id)
}

Healthcare Data Economy on Concordium

LED-UP utilizes Concordium's native CCD token and custom healthcare tokens to create sustainable economic incentives while maintaining regulatory compliance and transparency.