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

Last Update
15 December 2020
Ongoing Goals

Public testnet

In development
Public testnet for Chrysalis Part 2

Mainnet Launch

Chrysalis launched on IOTA mainnet.

WOTS to Ed25519 Transition

In research
Moving users away from the WOTS to the Ed25519 signature scheme.

Dust Protection

Request for comments
Protecting the network against dust attacks and ledger bloat.
Complete Goals

White-flag approach

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


Allows node software to find neighbors automatically.

Universally-random tip selection

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

Milestone selection

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

UTXO model

Allows for faster and more exact conflict handling, deals with possible scenarios of reattaching invalid transactions. Will allow the protocol to support colored coins in the future.

Reusable addresses

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

Atomic binary transactions

Move from the current trinary bundle construct and use simpler atomic binary transactions instead. This will reduce validation requirements, network overhead and maintainability of node software.

Internal testnet

Internal testnet for Chrysalis Part 2