diff --git a/contracts/Cargo.lock b/contracts/Cargo.lock
index 776720b..b0fbdb6 100644
--- a/contracts/Cargo.lock
+++ b/contracts/Cargo.lock
@@ -2891,7 +2891,7 @@ checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
 
 [[package]]
 name = "registry"
-version = "1.5.0"
+version = "1.6.0"
 dependencies = [
  "anyhow",
  "cost",
diff --git a/contracts/registry/CHANGELOG.md b/contracts/registry/CHANGELOG.md
index e7ba14b..2f75146 100644
--- a/contracts/registry/CHANGELOG.md
+++ b/contracts/registry/CHANGELOG.md
@@ -21,11 +21,20 @@ Change log entries are to be added to the Unreleased section. Example entry:
 
 ### Features
 
+### Breaking Changes
+
+### Bug Fixes
+
+## v1.6.0 (2023-10-08)
+
+### Features
+
 - New `GovBan` flag. Reserved for accounts with a history of misconduct, limiting their governance role while maintaining their voting rights as valued members of the Voting Body.
+- `sbt_revoke_by_owner` returns true if the issuer should continue to call the method to revoke all tokens. Otherwise the function return false. Moreover, the method has been improved and optimized.
 
 ### Breaking Changes
 
-### Bug Fixes
+- `sbt_mint` will set `issue_at` to the current time in milliseconds, if the value was not provided.
 
 ## v1.5.0 (2023-09-07)
 
diff --git a/contracts/registry/Cargo.toml b/contracts/registry/Cargo.toml
index cefd7c9..704d3a1 100644
--- a/contracts/registry/Cargo.toml
+++ b/contracts/registry/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "registry"
-version = "1.5.0"
+version = "1.6.0"
 authors = ["Robert Zaremba 'https://zaremba.ch/'"]
 edition = { workspace = true }
 repository = { workspace = true }
diff --git a/contracts/registry/src/lib.rs b/contracts/registry/src/lib.rs
index c4fe80f..75f6553 100644
--- a/contracts/registry/src/lib.rs
+++ b/contracts/registry/src/lib.rs
@@ -715,6 +715,7 @@ impl Contract {
         let ret_token_ids = (token..token + num_tokens).collect();
         let mut supply_by_class = HashMap::new();
         let mut per_recipient: HashMap<AccountId, Vec<TokenId>> = HashMap::new();
+        let now = env::block_timestamp_ms();
 
         for (owner, metadatas) in token_spec {
             // no need to check ongoing_soult_tx, because it will automatically ban the source account
@@ -723,8 +724,11 @@ impl Contract {
             let recipient_tokens = per_recipient.entry(owner.clone()).or_default();
             let metadatas_len = metadatas.len();
 
-            for metadata in metadatas {
+            for mut metadata in metadatas {
                 require!(metadata.class > 0, "Class must be > 0");
+                if metadata.issued_at.is_none() {
+                    metadata.issued_at = Some(now);
+                }
                 let prev = self.balances.insert(
                     &balance_key(owner.clone(), issuer_id, metadata.class),
                     &token,
@@ -937,7 +941,7 @@ mod tests {
     fn mk_metadata(class: ClassId, expires_at: Option<u64>) -> TokenMetadata {
         TokenMetadata {
             class,
-            issued_at: None,
+            issued_at: Some(START),
             expires_at,
             reference: Some("abc".to_owned()),
             reference_hash: Some(vec![61, 61].into()),