Module hashchain 

Hash chain helpers: canonicalization, chain construction, chain verification.

Enums

ChainError

Errors raised by chain verification.

Constants

HASH_PREFIX

Hash prefix for SHA-256 digests in this protocol.

Functions

append_event

Compute and assign this_event_hash for an event, given the previous chain tip.

append_event_value

Value-based chain production: seal a raw event JSON value onto the chain.

append_event_value_signed

Value-based chain production with an event SIGNATURE (v0.7 §3.5).

canonicalize

Canonicalize a JSON value to RFC 8785 (JCS) bytes for hashing.

compute_event_hash

Compute this_event_hash for an event represented as a JSON value with this_event_hash absent.

event_value_for_hashing

Produce the hashing view of an event JSON value (normative; see the Python SDK’s _event_to_canonical_dict, the single point of truth):

verify_chain

Verify a sequence of events forms a valid hash chain.

verify_chain_values

Verify a chain of events supplied as raw JSON values. Returns the tip hash.

verify_event

Verify a single event’s this_event_hash matches its recomputed hash.

verify_event_value

Verify a single event supplied as a raw JSON value.