Struct ChainContext 

pub struct ChainContext<'a> {
    pub enclave_pcrs: &'a PcrsHex,
    pub enclave_image_digest: &'a str,
    pub control_public_key: Option<&'a [u8]>,
    pub upgradable: bool,
    pub prior_chain: &'a [ChainLink],
}

Context the validator needs that lives outside the link itself: the enclave’s recorded metadata + the chain so far.

Backend usage: load from DB at ingest. SDK usage: fetch via GET /enclaves/{id} and iterate the chain returned from GET /enclaves/{id}/upgrade-chain, passing successively longer prefixes as prior_chain.

Fields

enclave_pcrs: &'a PcrsHex

PCR0/1/2 recorded for this enclave at build time. Every link’s attestation document must carry these PCRs.

enclave_image_digest: &'a str

Manifest digest of the Docker image currently pinned to this enclave row. Boot payloads must reference this digest.

control_public_key: Option<&'a [u8]>

Enclave’s 65-byte uncompressed SEC1 ECDSA P-256 control public key, or None when the enclave was created non-upgradable.

upgradable: bool

Whether the enclave was created with the upgradable flag. Upgrade / revocation links are rejected outright when false.

prior_chain: &'a [ChainLink]

Existing chain entries, in sequence order. May be empty (the link about to be validated would be genesis).