Bitcoin full node and query server

Jan 7, 2026

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Hello again! Your feedback regarding the disk space was correct. I wasn't expecting it to really be a disk issue as I had over 100gigs of disk space (don't remember the exact number). Now libbitcoin-node spawns and works just fine. I stumbled upon another "issue" when trying to port libbitcoin-node as a target for fuzzamoto. That is, fuzzamoto uses Nyx for deterministic snapshot fuzzing but due to its limited resources it doesn't have enough space to pre-allocate a regtest db profile. I played around and hacked a regtest config that seems to work ok and I would appreciate your feedback on whether I'm overdoing it or not. I haven't found any documentation around libbitcoin-node + regtest so I'm open to suggestions on that side too.

[log]
path = {logdir}

[bitcoin]
# Regtest genesis block (hex-encoded)
genesis_block = {genesis_hex}
# Regtest proof of work limit (0x207fffff = 545259519)
proof_of_work_limit = 545259519
# Accept any valid chain (no minimum work requirement)
minimum_work = 0000000000000000000000000000000000000000000000000000000000000000

[forks]
# Regtest allows easy mining without real proof of work
difficult = false

[network]
# Regtest network magic (0xDAB5BFFA = 3669344250)
identifier = 3669344250

[inbound]
# Listen for P2P connections
bind = 127.0.0.1:{p2p_port}
connections = 10
enable_loopback = true

[outbound]
# Disable outbound connections to prevent contacting mainnet seeds
connections = 0
host_pool_capacity = 0

[database]
path = {datadir}
# Tiny regtest DB profile (avoid multi-GB prealloc).
header_buckets = 1
header_size = 1000
txs_buckets = 1
txs_size = 1000
tx_buckets = 1
tx_size = 1000
point_buckets = 1
point_size = 1000
strong_tx_buckets = 1
strong_tx_size = 1000

input_size = 1000
ins_size = 1000
output_size = 1000
outs_size = 1000

candidate_size = 1000
confirmed_size = 1000
duplicate_buckets = 1
duplicate_size = 100
prevout_buckets = 0
prevout_size = 1

validated_bk_buckets = 1
validated_bk_size = 1000
validated_tx_buckets = 1
validated_tx_size = 1000

address_buckets = 1
address_size = 1000
filter_bk_buckets = 0
filter_tx_buckets = 0

[node]
# Don't delay inbound peers waiting for "current" chain state (regtest genesis is old).
delay_inbound = false