IOTA 1.5, the Mainnet’s intermediate stage before Coordicide is complete.

Last Update
23 June 2020
Ongoing Goals

White-flag approach

In development
A simpler, conflict-ignoring approach that allows for faster and more efficient tip selection, eliminates certain attacks and significantly reduces the need for reattachments.


In development
Allows node software to find neighbors automatically.

Universally-random tip selection

In development
Improves the performance of the tip selection algorithm, allowing nodes to find tip transactions faster.

Milestone selection

In research
Leads to the network being able to confirm more transactions per second.

UTXO model

Request for comments
Allows for faster and more exact conflict handling, add support for colored coins, and deals with possible scenarios of reattaching invalid transactions.

Reusable addresses

Request for comments
By adding support for a second signature scheme, the IOTA protocol will support reusable addresses.

Atomic transactions

In research
Move from the current Bundle construct and use simpler atomic transactions instead. This will reduce network overhead and maintainability of node software.

Binary transaction layout

In research
This allows us to work on binary data, for validation, IO and other processing without the need to have many binary-ternary conversions as in the current node software.