29th March 2019
Cardano 1.5.0 and Cardano 1.5.1 released
IOHK released Cardano 1.5.0 with Cardano SL 3.0.0 and Daedalus 0.13.0 on 20 March 2019 [EN],[JA],[KO]. It was followed by a hotfix release Cardano 1.5.1 [testnet, mainnet] with Cardano SL 3.0.1 and Daedalus 0.13.1 on 22 March 2019. We recommend all exchanges upgrade to the latest version of cardano-sl - currently 3.0.1 and test on a separate node.
Cardano 1.5 includes the following backward-incompatible changes:
- the Cardano wallet v0 API has been removed
- the Network Time Protocol API endpoint localTimeInformation response has been refined to include a more descriptive status
- a new consensus implementation based on the Ouroboros Byzantine fault tolerance (Ouroboros BFT) algorithm will be activated later
Cardano Byron phase completion
The Byron era is ending soon and to make the transition to Ouroboros BFT and decentralization there are two planned hard forks. The first hard fork will occur within weeks, but not before April 28, 2019. The second will be advertised closer to the time. It is essential that exchanges upgrade to the v1 wallet API and Cardano 1.5.1 as soon as possible, and certainly within this time window. After the majority of clients have upgraded to Cardano 1.5.1, we will switch from the original consensus algorithm to Ouroboros BFT via a protocol update in the first of the two hard forks.
Upgrading cardano-sl 1.3.2
If upgrading from Cardano 1.3.2 to 1.5.1, clients will lose wallet metadata: the name, assurance level and unused addresses. Only the information available on the blockchain will be recoverable. This will not happen when upgrading from 1.3.2 to 1.4.1 or from 1.4.1 to 1.5.1. The 1.4.1 release includes logic to allow for the recovery of metadata from the old data layer.
All users are encouraged to experiment with Cardano’s features on the Cardano testnet before upgrading.
Public days at IOHK’s April summit
IOHK is hosting a public event in Miami, USA. On April 17-18, IOHK’s founders, scientists, and engineers will set out their goals and products, and reveal the vision for Cardano 2020. Talks and workshops will cover a variety of subjects. There will also be a private workshop for IOHK exchange partners.
If an exchange has an explicit feature request for the wallet API, or the wallet in general, please contact us in the usual way, or email your suggestion to email@example.com with the subject ‘New Feature Request’.
For any other issues during upgrade or migration, please contact us on firstname.lastname@example.org or email@example.com.
IOHK Exchange Support Team
The previous newsletter can be found here