The Ethereum Genesis block refers to the first block in the Ethereum blockchain. It was mined on July 30, 2015, marking the beginning of the Ethereum network. Here are some key details about the Ethereum Genesis block:

1. Block Height: The Genesis block has a block height of 0, indicating that it is the starting point of the Ethereum blockchain.

2. Timestamp: The timestamp of the Ethereum Genesis block is set to July 30, 2015, at 13:20:40 UTC.

3. Difficulty and Nonce: Similar to the Bitcoin Genesis block, the Ethereum Genesis block also has specific difficulty and nonce values that were predetermined by the Ethereum development team.

4. Ethash Proof-of-Work: The Ethereum blockchain initially used the Ethash algorithm for its proof-of-work consensus mechanism. The Ethash algorithm was designed to be ASIC-resistant, providing a fairer mining distribution in the early stages of Ethereum.

5. Allocation of Ether: The Ethereum Genesis block includes an allocation of Ether (ETH), the native cryptocurrency of the Ethereum network. This allocation includes a specific amount of Ether distributed to different accounts, including the Ethereum Foundation.

The Ethereum Genesis block serves as the foundation for the entire Ethereum network, establishing the initial state of the blockchain. It holds historical significance within the Ethereum ecosystem and sets the stage for subsequent blocks and smart contract deployments.

It's important to note that the Ethereum network has undergone several upgrades and changes since the Genesis block, including the transition from proof-of-work to proof-of-stake with Ethereum 2.0.