How do I use the flag: authorization revocable

Question

If I issued a coin what steps would I take to have the issuing account revoke its credit held by other accounts?

Answer 1

Haven't tested it myself, but here is quote form Stellar documentation:

Controlling asset holders

As an anchor, you can mark the issuing account AUTHORIZATION REQUIRED. With this setting, the anchor must approve anyone who wants to hold its credit, allowing it to control who its customers are.

Revoking access

As an anchor, you can mark the issuing account AUTHORIZATION REVOCABLE. With this setting, the anchor can freeze credit held by another account. When credit is frozen for a particular account, that account can only send the credit back to the anchor–it can’t transfer the credit to any other account. This setting allows the issuing account to revoke credit that it accidentally issued or that was obtained improperly.

The issuer allows trust for new trustlines with ALLOW_TRUST operation.

Updates the “authorized” flag of an existing trust line, this is called by the issuer of the asset.

I guess that ALLOW_TRUST operation should be included into the same transaction where the account creates a trustline to the asset (CHANGE_TRUST operation). In this case the transaction have to be signed by both asset issuer and trustor private keys. However, I may be wrong here.

In case you want to revoke a trustline, the issuer account need to submit the ALLOW_TRUST operation with authorize field set to false.

Answer 2

authorize : true

allow trust operation when issuer authorize the user for its asset

authorize : false

allow trust operation to revoke the acess for asset

execute this code

app.get('/authaccfalse', function (req, res) {
    try {
        var authaccount = foraccountToRevokeAcess.publicKey;
        server.loadAccount(issuingKeys.publicKey())
            .then(function (receiver) {
                var transaction = new StellarSdk.TransactionBuilder(receiver)
                    .addOperation(StellarSdk.Operation.allowTrust({
                        assetCode: "okToken",
                        trustor: authaccount,
                        authorize: false
                    }))
                    .build();
                transaction.sign(issuingKeys);
                server.submitTransaction(transaction);
                console.log('authaccfalse');
            })

            .catch(function (error) {
                console.error('Error!', error);
            });
    }
    catch (e) {
        console.log("error occured")
    }
});