Withdraw flow

The sequence diagram below describes the flow of withdrawing a issued certificate. It works by having Stamp keeping track of all withdrawn certificates. The Vault polls all Stamps for a configured interval and withdraws the certificates in the Vault database. If the certificate, or a part of the certificate, was claimed then the counterpart of the claim is unclaimed.

sequenceDiagram
    participant cl as Client
    participant st as Stamp
    participant re as Registry
    participant wa as Wallet

    cl->>st: POST: withdraw
    st->>re: gRPC: Withdraw
    st-->>cl: 201 Created

    alt Polls all stamps for withdrawn certificates in interval
        wa->>st: GET: certificates/withdrawn?lastWithdrawnId=
        st-->>wa: Withdrawn certificates
        alt Foreach withdrawn certificate
            wa->>wa: Withdraw certificate in DB
            wa->>wa: Get claimed slices of certificate
            alt Foreach claimed slices
                wa->>wa: Get counterpart of claim
                wa->>re: gRPC: Unclaim counterpart
                wa->>wa: Update slice to Available
                wa->>wa: Unclaim Claim
            end
        end
    end

This above means Vault needs to know all known Issuers (Stamps) in the network.