Epoch

Một epoch là một đơn vị thời gian khi các validator của network không đổi. It is measured in blocks:

Both testnet and mainnet have an epoch duration of 43,200 blocks. Ideally epochs last about 12 hours, since blocks are created every second (in reality, they take slightly longer to be created).
You can view this setting by querying the protocol_config RPC endpoint and searching for epoch_length.

Lưu ý: Các Node garbage thu thập các block sau 5 epoch (~2.5 ngày) trừ khi chúng là các archival node.

Example:

JSON
HTTPie

{
  "jsonrpc": "2.0",
  "id": "dontcare",
  "method": "EXPERIMENTAL_protocol_config",
  "params": {
    "finality": "final"
  }
}

http post https://rpc.testnet.near.org jsonrpc=2.0 id=dontcare method=EXPERIMENTAL_protocol_config \
  params:='{
    "finality": "final"
  }'

Ví dụ response nhận được là:

{
    "jsonrpc": "2.0",
    "result": {
        "protocol_version": 44,
        "genesis_time": "2020-07-21T16:55:51.591948Z",
        "chain_id": "mainnet",
        "genesis_height": 9820210,
        "num_block_producer_seats": 100,
        "num_block_producer_seats_per_shard": [
            100
        ],
        "avg_hidden_validator_seats_per_shard": [
            0
        ],
        "dynamic_resharding": false,
        "protocol_upgrade_stake_threshold": [
            4,
            5
        ],
        "epoch_length": 43200,
        "gas_limit": 1000000000000000,
        "min_gas_price": "1000000000",
        "max_gas_price": "10000000000000000000000",
        "block_producer_kickout_threshold": 90,
        "chunk_producer_kickout_threshold": 90,

// ---- snip ----
}