Test Networks

Mainnet is the main Tezos network, but is not appropriate for testing. Other networks are available to this end. Test networks usually run with different constants to speed up the chain.

There is one test network for the current protocol, and one test network for the protocol which is being proposed for voting. The former is obviously important as users need to test their development with the current protocol. The latter is also needed to test the proposed protocol and its new features, both to decide whether to vote yes and to prepare for its activation. After the intended protocol of a test network is activated (such as Carthage for Carthagenet), the protocol no longer changes because this could break the workflow of some users while they are testing their development, as they may not be ready for the new protocol. So every time a new protocol is proposed on Mainnet, a new test network is spawned. This also makes synchronization much faster than with a long-lived network.

Get Free Funds

Test networks have a list of built-in accounts with some funds. You can obtain the key to these accounts from a faucet to claim the funds. All networks share the same faucet: https://faucet.tzalpha.net/. The keys obtained from this faucet can be used in all test networks.


  • Built-in Multinetwork Node alias: carthagenet

  • Run Docker image: wget -O carthagenet.sh https://gitlab.com/tezos/tezos/raw/latest-release/scripts/tezos-docker-manager.sh

Carthagenet is a test network running the Carthage protocol. Carthagenet will run until Carthage is replaced by another protocol on Mainnet.

On Carthagenet, the following constants differ from Mainnet:

  • preserved_cycles is 3 instead of 5;

  • blocks_per_cycle is 2048 instead of 4096;

  • blocks_per_voting_period is 2048 instead of 32768;

  • time_between_blocks is [ 30, 40 ] instead of [ 60, 40 ];

  • test_chain_duration is 43200 instead of 1966080;

  • quorum_min is 3000 (i.e. 30%) instead of 2000 (i.e. 20%);

This results in a faster chain than Mainnet:

  • 2 blocks per minute;

  • a cycle should last about 17 hours;

  • a voting period lasts 1 cycle and should thus also last about 17 hours.


  • Git branch: zeronet

  • Run Docker image: wget -O zeronet.sh https://gitlab.com/tezos/tezos/raw/zeronet/scripts/alphanet.sh

Zeronet is an unstable test network. It is often reset to keep the chain short and to allow testing of protocols under development.

On Zeronet, the following constants differ from Mainnet:

  • blocks_per_cycle is 128 instead of 4096;

  • blocks_per_roll_snapshot is 8 instead of 256;

  • blocks_per_voting_period is 2816 instead of 32768;

  • time_between_blocks is [ 20 ] instead of [ 60, 40 ];

  • test_chain_duration is 43200 instead of 1966080;

  • quorum_min is 3000 (i.e. 30%) instead of 2000 (i.e. 20%);

  • delay_per_missing_endorsement is 2 instead of 8.

This results in a chain which moves even faster than Carthagenet:

  • 3 blocks per minute instead of 1,

  • one cycle should last less than 43 minutes instead of 2 days and 20 hours,

  • a voting period should last less than 16 hours instead of about 23 days. Note that in Zeronet, a voting period is 22 cycles instead of 8 cycles in Mainnet.

Future Networks

At some point, there will be a proposal for a successor to the current protocol (let’s call this new protocol P). After P is injected, a new test network (let’s call it P-net) will be spawned. It will run alongside the latest test network until either P is rejected or activated. If P is rejected, P-net will end, unless P is immediately re-submitted for injection. If, however, P is activated, the previous test network will end and P-net will continue on its own.

Old Networks


Babylonnet was a test network which ran the Babylon protocol. It was spawned after the injection of the proposal for Babylon. It ended its life on March 31st, 2020 as Carthage replaced Babylon on Mainnet on March 5th, 2020.


Alphanet was the test network before Babylonnet. At the end of its life, it was running the Athens protocol. Bootstrap nodes were shut down after the Babylon protocol was activated on Mainnet.