Module policy

Bitcoin policy.

This module exposes some constants and functions used in the reference implementation and which, as a consequence, define some network rules.

Warning

While the constants present in this module are very unlikely to change, they do not define Bitcoin. As such they must not be relied upon as if they were consensus rules.

These values were taken from bitcoind v0.21.1 (194b9b8792d9b0798fdb570b79fa51f1d1f5ebaf).

Constants

DEFAULT_BYTES_PER_SIGOP

The number of bytes equivalent per signature operation. Affects transaction relay through the virtual size computation.

DEFAULT_INCREMENTAL_RELAY_FEE

The minimum incremental feerate (despite the name), in sats per virtual kilobyte for RBF.

DEFAULT_MEMPOOL_EXPIRY

Default number of hours for an unconfirmed transaction to expire in most of the network nodes’ mempools.

DEFAULT_MIN_RELAY_TX_FEE

Minimum feerate, in sats per virtual kilobyte, for a transaction to be relayed by most nodes on the network.

DUST_RELAY_TX_FEE

The minimum feerate, in sats per kilo-virtualbyte, for defining dust. An output is considered dust if spending it under this feerate would cost more in fee.

MAX_STANDARD_TX_SIGOPS_COST

Maximum number of sigops in a standard tx.

MAX_STANDARD_TX_WEIGHT

Maximum weight of a transaction for it to be relayed by most nodes on the network

MIN_STANDARD_TX_NONWITNESS_SIZE

Minimum non-witness size for a standard transaction (1 segwit input + 1 P2WPKH output = 82 bytes)

Functions

get_virtual_tx_size

The virtual transaction size, as computed by default by bitcoind node.