Merge pull request bitcoinjs#1425 from lukechilds/psbt

[WIP] Add PSBT support

Author: junderw

README.md

@@ -85,6 +85,14 @@ The below examples are implemented as integration tests, they should be very eas
 Otherwise, pull requests are appreciated.
 Some examples interact (via HTTPS) with a 3rd Party Blockchain Provider (3PBP).
 
+### Warning: Currently the tests use TransactionBuilder, which will be removed in the future (v6.x.x or higher)
+We will move towards replacing all instances of TransactionBuilder in the tests with the new Psbt.
+
+Currently we have a few examples on how to use the newer Psbt class at the following link:
+- [Psbt examples](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/transactions-psbt.js)
+
+The rest of the examples are below (using TransactionBuilder for Transaction creation)
+
 - [Generate a random address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/addresses.js)
 - [Import an address via WIF](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/addresses.js)
 - [Generate a 2-of-3 P2SH multisig address](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/addresses.js)

package-lock.json

@@ -47,6 +47,7 @@
   "dependencies": {
     "@types/node": "10.12.18",
     "bech32": "^1.1.2",
+    "bip174": "^1.0.0",
     "bip32": "^2.0.3",
     "bip66": "^1.1.0",
     "bitcoin-ops": "^1.4.0",

package.json

@@ -16,6 +16,8 @@ const script = require('./script');
 exports.script = script;
 var block_1 = require('./block');
 exports.Block = block_1.Block;
+var psbt_1 = require('./psbt');
+exports.Psbt = psbt_1.Psbt;
 var script_1 = require('./script');
 exports.opcodes = script_1.OPS;
 var transaction_1 = require('./transaction');