A service for making unsigned Bitcoin transactions from arbitrary inputs. Uses blockchain.info public API for getting available inputs.
Uses the FIFO coin selection method defined in Erhart's Master's thesis An Evaluation of Coin Selection Strategies.
Running in docker
docker-compose up -d
Usage
curl -X POST \
http://localhost:8080/payment_transactions \
-d '{ "source_address": "1HCuHELi5PX8mnLTSkPv27T48K4ig4CJUP", "outputs": { "1AbrhLo1S2Li9dStQsujqTgZQD9wG1VWcG": "1.11", "3QGenMj5hD4LBp24xow1hsagmMDjgnDpoo": "0.58", "18Tx44rfsnjCVjwUBaxywpDKMPc3qkgc6f": "1.11" }, "fee_kb": 2000}'A raw unsigned transaction's hex and a list of used inputs will be returned.
Development
pipenv install --dev
make run (or make run-testnet forrunningin testnet)Linters, isort and mypy
make
Running tests
pytest
Supported env variables
TESTNET- Use testnet Bitcoin network (default=false)PORT- HTTP service port number (default=8080)
Possible improvements
- More tests for UTXO choosing logic
- Support pagination in
bitcoin.get_unspent - More transaction checks in tests (e.g. amount matching and adequate fee)