# Cancun Upgrade **Summary**: The JIB Chain Cancun-Deneb (Dencun) Upgrade, set to launch on March 12, 2024, heralds a transformative chapter for the JBC network. It's not merely a hard fork; it's a symphony of innovation orchestrated to elevate JBC's scalability, security, and user-friendliness to unparalleled heights. Central to this upgrade are Ethereum Improvement Proposals (EIPs), with EIP-4844 shining as the beacon of progress with its groundbreaking proto-danksharding. Through these meticulously crafted changes, the upgrade promises a landscape of enhanced network efficiency and diminished transaction fees, setting the stage for a flourishing ecosystem on JBC. Drawing from the triumphs of predecessors like the Shanghai upgrade, this evolution is poised to deliver a resilient foundation for decentralized applications, promising a delightful user journey through the beatific realm of JBC's potential.

Image from: https://www.datawallet.com/crypto/ethereum-cancun-upgrade-explained

*** ### genesis.json 
{
  "config": {
    "chainId": 8899,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "muirGlacierBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "arrowGlacierBlock": 0,
    "grayGlacierBlock": 0,
    "mergeForkBlock": 2200641,
    "terminalTotalDifficulty": 512048629250937967,
    "terminalTotalDifficultyPassed": true,
    "shanghaiTime": 1701158251,
    "cancunTime": 1710220283,
    "ethash": {}
  },
  "nonce": "0x0",
  "gasLimit": "8000000",
  "difficulty": "0x40000",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "alloc": {
    "4Fbd49c841c2f891b8e04B887B9C5035BE7c7209": {
      "balance": "1000000000000000000000000001"
    }
  },
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "baseFeePergas": "0x2540BE400"
}
On genesis.json file add line 22 to schedule upgrade time for execution layer. ``` "cancunTime": 1710220283 ``` Tue Mar 12 2024 12:11:23 GMT+0700 (Indochina Time) *** ### Config.yml {% code title="" lineNumbers="true" %} ```yaml # Extends the mainnet preset PRESET_BASE: 'mainnet' CONFIG_NAME: 'jibchain' # needs to exist because of Prysm. Otherwise it conflicts with mainnet genesis # Genesis # --------------------------------------------------------------- # `2**14` (= 16,384) MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 1 # Friday, April 22, 2022 9:00:00 AM +UTC MIN_GENESIS_TIME: 1701158551 GENESIS_FORK_VERSION: 0x10008899 GENESIS_DELAY: 100 # Forking # --------------------------------------------------------------- # Some forks are disabled for now: # - These may be re-assigned to another fork-version later # - Temporarily set to max uint64 value: 2**64 - 1 # Altair ALTAIR_FORK_VERSION: 0x20008899 ALTAIR_FORK_EPOCH: 1 # Merge BELLATRIX_FORK_VERSION: 0x30008899 BELLATRIX_FORK_EPOCH: 1 TERMINAL_TOTAL_DIFFICULTY: 512048629250937967 TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000 TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615 # Capella CAPELLA_FORK_VERSION: 0x40008899 CAPELLA_FORK_EPOCH: 1 # Sharding SHARDING_FORK_VERSION: 0x70008899 SHARDING_FORK_EPOCH: 18446744073709551615 # Deneb DENEB_FORK_VERSION: 0x08008899 DENEB_FORK_EPOCH: 23598 # Time parameters # --------------------------------------------------------------- # 12 seconds SECONDS_PER_SLOT: 12 # 14 (estimate from Eth1 mainnet) SECONDS_PER_ETH1_BLOCK: 14 # 2**8 (= 256) epochs ~27 hours MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256 # 2**8 (= 256) epochs ~27 hours SHARD_COMMITTEE_PERIOD: 256 # 2**11 (= 2,048) Eth1 blocks ~8 hours ETH1_FOLLOW_DISTANCE: 2048 # Validator cycle # --------------------------------------------------------------- # 2**2 (= 4) INACTIVITY_SCORE_BIAS: 4 # 2**4 (= 16) INACTIVITY_SCORE_RECOVERY_RATE: 16 # 2**4 * 10**9 (= 16,000,000,000) Gwei EJECTION_BALANCE: 16000000000 # 2**2 (= 4) MIN_PER_EPOCH_CHURN_LIMIT: 4 # 2**16 (= 65,536) CHURN_LIMIT_QUOTIENT: 65536 # [New in Deneb:EIP7514] 2**3 (= 8) MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT: 8 # Fork choice # --------------------------------------------------------------- # 40% PROPOSER_SCORE_BOOST: 40 # Deposit contract # --------------------------------------------------------------- DEPOSIT_CHAIN_ID: 8899 DEPOSIT_NETWORK_ID: 8899 DEPOSIT_CONTRACT_ADDRESS: 0xe9364471539cD35D1911f844914c7DaBf7aeE92D # Networking # --------------------------------------------------------------- # `10 * 2**20` (= 10485760, 10 MiB) GOSSIP_MAX_SIZE: 10485760 # `2**10` (= 1024) MAX_REQUEST_BLOCKS: 1024 # `2**8` (= 256) EPOCHS_PER_SUBNET_SUBSCRIPTION: 256 # `MIN_VALIDATOR_WITHDRAWABILITY_DELAY + CHURN_LIMIT_QUOTIENT // 2` (= 33024, ~5 months) MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024 # `10 * 2**20` (=10485760, 10 MiB) MAX_CHUNK_SIZE: 10485760 # 5s TTFB_TIMEOUT: 5 # 10s RESP_TIMEOUT: 10 ATTESTATION_PROPAGATION_SLOT_RANGE: 32 # 500ms MAXIMUM_GOSSIP_CLOCK_DISPARITY: 500 MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000 MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000 # 2 subnets per node SUBNETS_PER_NODE: 2 # 2**8 (= 64) ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 # ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS ATTESTATION_SUBNET_PREFIX_BITS: 6 # Deneb # `2**7` (=128) MAX_REQUEST_BLOCKS_DENEB: 128 # MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK MAX_REQUEST_BLOB_SIDECARS: 768 # `2**12` (= 4096 epochs, ~18 days) MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS: 4096 # `6` BLOB_SIDECAR_SUBNET_COUNT: 6 ``` {% endcode %} Add DENEB FORK ``` DENEB_FORK_VERSION: 0x08008899 DENEB_FORK_EPOCH: 23598 ``` Add Validator cycle and PROPOSER\_SCORE\_BOOST config ``` # [New in Deneb:EIP7514] 2**3 (= 8) MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT: 8 # Fork choice # --------------------------------------------------------------- # 40% PROPOSER_SCORE_BOOST: 40 ``` Add networking config ``` # Networking # --------------------------------------------------------------- # `10 * 2**20` (= 10485760, 10 MiB) GOSSIP_MAX_SIZE: 10485760 # `2**10` (= 1024) MAX_REQUEST_BLOCKS: 1024 # `2**8` (= 256) EPOCHS_PER_SUBNET_SUBSCRIPTION: 256 # `MIN_VALIDATOR_WITHDRAWABILITY_DELAY + CHURN_LIMIT_QUOTIENT // 2` (= 33024, ~5 months) MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024 # `10 * 2**20` (=10485760, 10 MiB) MAX_CHUNK_SIZE: 10485760 # 5s TTFB_TIMEOUT: 5 # 10s RESP_TIMEOUT: 10 ATTESTATION_PROPAGATION_SLOT_RANGE: 32 # 500ms MAXIMUM_GOSSIP_CLOCK_DISPARITY: 500 MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000 MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000 # 2 subnets per node SUBNETS_PER_NODE: 2 # 2**8 (= 64) ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 # ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS ATTESTATION_SUBNET_PREFIX_BITS: 6 # Deneb # `2**7` (=128) MAX_REQUEST_BLOCKS_DENEB: 128 # MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK MAX_REQUEST_BLOB_SIDECARS: 768 # `2**12` (= 4096 epochs, ~18 days) MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS: 4096 # `6` BLOB_SIDECAR_SUBNET_COUNT: 6 ``` [^1]: Schedule cancunTime for upgrade --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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