# by `fundrawtransaction` to make the transaction balance.
rawtx2 = e1.createrawtransaction(
[],
[{
e2.getnewaddress(): 100
}, {
e1.getnewaddress(): 5
}, {
"fee": Decimal("0.1")
}],
)
# Fee outputs are unblinded, with a scriptPubKey of "". On Elements, empty
# scriptPubKeys are unspendable.
# Next we can fund the transaction (and replaces fee with something more appropriate)
fundedtx = e1.fundrawtransaction(rawtx2)
# Blind
blindedtx = e1.blindrawtransaction(fundedtx["hex"])
# In some cases, such as when there is one blinded output but no blinded inputs,
# blinding will fail. The `ignoreblindfails` option to `blindrawtransaction` may
# be set, in which case the transaction will "successfully" not be blinded.
#
# To unconditionally blind a transaction, ensure that it has 2 or more outputs,
# which will ensure that blinding is (a) useful and (b) mathematically possible.
# Sign
signedtx = e1.signrawtransactionwithwallet(blindedtx)
# And send
# This step is fairly complicated and will be significantly simplified by
# future RPC improvements.
#
# First, each party generates a new address
print ("2a. Exchange addresses")
alice_addr = alice.getnewaddress()
carol_addr = carol.getnewaddress()
print (" Alice: ", alice_addr)
print (" Carol: ", carol_addr)
# Then they each create and fund (but don't sign!) partial transactions
# which simply send the assets to each other.
print ("2b. Exchange partial transaction data")
raw_tx_a = alice.createrawtransaction(outputs=[{carol_addr: 2500}])
funded_a = alice.fundrawtransaction(raw_tx_a)['hex']
raw_tx_c = carol.createrawtransaction(outputs=[{alice_addr: 1000, "asset": asset_ALT}])
funded_c = carol.fundrawtransaction(raw_tx_c)['hex']
# Each party cross-checks the other's transaction
print ("2c. Check partial transactions")
decoded_a = carol.decoderawtransaction(funded_a)
carol_spk = carol.validateaddress(carol_addr)['scriptPubKey']
found_my_output = False
feerate = None
for output in decoded_a["vout"]:
if output["scriptPubKey"]["type"] == "fee" and output["asset"] == asset_BTC:
# Feerate multiplier is 10^8 (btc->sat) / 10^3 (bytes->kb) to get a value in sat/kb
feerate = 100000.0 * float(output["value"]) / decoded_a["vsize"]