generated: '2026-07-19'
method: searched
source: https://docs.espressosys.com/network/network/changelog
docs: https://docs.espressosys.com/network/network/changelog
scheme: named-network-releases
detail: >-
  Espresso publishes a reverse-chronological history of network releases, each a
  named milestone (mainnet phases and coffee-themed testnets) rather than semver.
  The REST API's major version is tied to these releases (API moved v0 -> v1 with
  the Mainnet testnet release, April 2025).
current_version: Mainnet 1.0 (Proof of Stake)
current_api_version: v1
entries:
- release: Proof of Stake (Mainnet)
  date: '2026-03'
  type: addition
  highlights: Activated permissionless validator participation via delegated proof-of-stake.
- release: Mainnet (testnet release)
  date: '2025-04'
  type: breaking
  highlights: >-
    Permissionless validator set; new stake and ESP token contracts; REST API
    moved from v0 to v1.
- release: Mainnet 0
  date: '2024-10'
  type: release
  highlights: First production deployment — 20 operators, 100 nodes, 1 MB initial block size.
- release: Decaf Testnet
  date: '2024-09'
  type: addition
  highlights: Persistent testnet launched alongside Mainnet; expanded to 24 operators / 100 distributed nodes.
- release: Cappuccino Testnet
  date: '2024-05'
  type: addition
  highlights: 10 operators onboarded; VID support added to the DA layer; Arbitrum Nitro fraud-proof support enabled.
- release: Gibraltar Testnet
  date: '2024-01'
  type: addition
  highlights: First integration with Arbitrum Nitro; VID implementation progress; external operator collaboration.
- release: Cortado Testnet
  date: '2023-09'
  type: addition
  highlights: First integration with the OP Stack; public testnet with dual-stack chains.
- release: Doppio Testnet
  date: '2023-07'
  type: addition
  highlights: Second testnet with a minimal chain example and Polygon zkEVM stack integrations.