MAX_BLOCK_SIZE = 1000000

MAX_STANDARD_TX_SIZE = 100000

MAX_P2SH_SIGOPS = 15

MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50

MAX_STANDARD_TX_SIGOPS = MAX_BLOCK_SIGOPS/5

MIN_FEE = 10

MAX_SCRIPT_ELEMENT_SIZE = 520

MAX_OPS_PER_SCRIPT = 201

MAX_PUBKEYS_PER_MULTISIG = 20

NULL_DATA_LIMIT = 80

# SCRIPT VERIFICATION FLAGS

SCRIPT_VERIFY_NONE = 0b0000000000000001

# ??

SCRIPT_VERIFY_P2SH = 0b0000000000000010

# Evaluate P2SH subscripts (softfork safe, BIP16).

SCRIPT_VERIFY_STRICTENC = 0b0000000000000100

# Passing a non-strict-DER signature or one with undefined hashtype to a

# checksig operation causes script failure.

# Evaluating a pubkey that is not (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes)

# by checksig causes script failure.

# (softfork safe, but not used or intended as a consensus rule).

SCRIPT_VERIFY_DERSIG = 0b0000000000001000

# Passing a non-strict-DER signature to a checksig operation causes script failure

# (softfork safe, BIP62 rule 1)

SCRIPT_VERIFY_LOW_S = 0b0000000000010000

# Passing a non-strict-DER signature or one with S > order/2 to a checksig operation

# causes script failure

# (softfork safe, BIP62 rule 5).

SCRIPT_VERIFY_NULLDUMMY = 0b0000000000100000

# verify dummy stack item consumed by CHECKMULTISIG is of zero-length

# (softfork safe, BIP62 rule 7).

SCRIPT_VERIFY_SIGPUSHONLY = 0b0000000001000000

# Using a non-push operator in the scriptSig causes script failure

# (softfork safe, BIP62 rule 2).

SCRIPT_VERIFY_MINIMALDATA = 0b0000000010000000

# Require minimal encodings for all push operations (OP_0... OP_16, OP_1NEGATE

# where possible, direct pushes up to 75 bytes, OP_PUSHDATA up to 255 bytes,

# OP_PUSHDATA2 for anything larger). Evaluating any other push causes the script

# to fail (BIP62 rule 3). In addition, whenever a stack element is interpreted

# as a number, it must be of minimal length (BIP62 rule 4).

SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = 0b0000000100000000

# Discourage use of NOPs reserved for upgrades (NOP1-10)

# Provided so that nodes can avoid accepting or mining transactions

# containing executed NOP's whose meaning may change after a soft-fork,

# thus rendering the script invalid; with this flag set executing

# discouraged NOPs fails the script. This verification flag will never be

# a mandatory flag applied to scripts in a block. NOPs that are not

# executed, e.g. within an unexecuted IF ENDIF block, are *not* rejected.

SCRIPT_VERIFY_CLEANSTACK = 0b0000001000000000

# Require that only a single stack element remains after evaluation. This changes the success criterion from

# "At least one stack element must remain, and when interpreted as a boolean, it must be true" to

# "Exactly one stack element must remain, and when interpreted as a boolean, it must be true".

# (softfork safe, BIP62 rule 6)

# Note: CLEANSTACK should never be used without P2SH.

SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY = 0b0000010000000000

# See BIP65 for details.

SCRIPT_VERIFY_CHECKSEQUENCEVERIFY = 0b0000100000000000

# See BIP112 for details

MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH

STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |\

SCRIPT_VERIFY_STRICTENC |\

SCRIPT_VERIFY_MINIMALDATA |\

SCRIPT_VERIFY_NULLDUMMY |\

SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |\

SCRIPT_VERIFY_CLEANSTACK