Cancun Upgrade

The JIB Chain Cancun-Deneb (Dencun) 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

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,
    
    "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

# 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

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