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March 27, 2014 16:11
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FROM: https://people.xiph.org/~greg/signdemo.txt | |
With Bitcoin 0.7 it's possible to keep your private keys | |
entirely offline without third party software. | |
In this example we have two hosts [offline] which is | |
totally offline and without a copy of the blockchain | |
and [online] which is a regular online node, both | |
running bitcoin 0.7. | |
This example uses the CLI, but it works equally well with | |
the GUI console interface-- just leave off the "bitcoind" | |
at the start of every command. | |
We're going to generate a key on the offline wallet, then | |
send it 50 BTC with an online wallet, then using the online | |
wallet draft a transaction to send it back, then sign that | |
with the offline wallet, and finally announce the signed | |
transaction into the network using the online wallet. | |
First generate an address offline: | |
[offline]$ bitcoind getnewaddress | |
n1gqLjZbRH1biT5o4qiVMiNig8wcCPQeB9 | |
Then, send it 50 coin: | |
[online]$ bitcoind sendtoaddress n1gqLjZbRH1biT5o4qiVMiNig8wcCPQeB9 50 | |
a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c | |
Now, grab the transaction that was paying it. We'll need the txid, and the | |
scriptpubkey paying our offline wallet. | |
[online]$ bitcoind getrawtransaction a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c 1 | |
{ | |
"hex" : "0100000001344630cbff61fbc362f7e1ff2f11a344c29326e4ee96e787dc0d4e5cc02fd069000000004a493046022100ef89701f460e8660c80808a162bbf2d676f40a331a243592c36d6bd1f81d6bdf022100d29c072f1b18e59caba6e1f0b8cadeb373fd33a25feded746832ec179880c23901ffffffff0100f2052a010000001976a914dd40dedd8f7e37466624c4dacc6362d8e7be23dd88ac00000000", | |
"txid" : "a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c", | |
"version" : 1, | |
"locktime" : 0, | |
"vin" : [ | |
{ | |
"txid" : "69d02fc05c4e0ddc87e796eee42693c244a3112fffe1f762c3fb61ffcb304634", | |
"vout" : 0, | |
"scriptSig" : { | |
"asm" : "3046022100ef89701f460e8660c80808a162bbf2d676f40a331a243592c36d6bd1f81d6bdf022100d29c072f1b18e59caba6e1f0b8cadeb373fd33a25feded746832ec179880c23901", | |
"hex" : "493046022100ef89701f460e8660c80808a162bbf2d676f40a331a243592c36d6bd1f81d6bdf022100d29c072f1b18e59caba6e1f0b8cadeb373fd33a25feded746832ec179880c23901" | |
}, | |
"sequence" : 4294967295 | |
} | |
], | |
"vout" : [ | |
{ | |
"value" : 50.00000000, | |
"n" : 0, | |
"scriptPubKey" : { | |
"asm" : "OP_DUP OP_HASH160 dd40dedd8f7e37466624c4dacc6362d8e7be23dd OP_EQUALVERIFY OP_CHECKSIG", | |
"hex" : "76a914dd40dedd8f7e37466624c4dacc6362d8e7be23dd88ac", | |
"reqSigs" : 1, | |
"type" : "pubkeyhash", | |
"addresses" : [ | |
"n1gqLjZbRH1biT5o4qiVMiNig8wcCPQeB9" | |
] | |
} | |
} | |
] | |
} | |
And lets get an address to return those coins to: | |
[online]$ bitcoind getnewaddress | |
mkZBYBiq6DNoQEKakpMJegyDbw2YiNQnHT | |
Now, from our online node we're going to draft the transaction to | |
return the coin from the offline wallet to the online one: | |
[online]$ bitcoind createrawtransaction '[{"txid":"a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c","vout":0}]' '{"mkZBYBiq6DNoQEKakpMJegyDbw2YiNQnHT":50}' | |
01000000010c432f4fb3e871a8bda638350b3d5c698cf431db8d6031b53e3fb5159e59d4a90000000000ffffffff0100f2052a010000001976a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac00000000 | |
One the offline wallet we decode the transaction to validate that its doing | |
what we expect. Note: Since we don't have the input transaction we don't | |
know the input value and this txn could be paying a ton of change out | |
to fees. | |
[offline]$ bitcoind decoderawtransaction 01000000010c432f4fb3e871a8bda638350b3d5c698cf431db8d6031b53e3fb5159e59d4a90000000000ffffffff0100f2052a010000001976a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac00000000 | |
{ | |
"txid" : "d9f33ed2740eef77e40e72b692c4cf1feb6ab10d8adaaf27eb394fa5064b1160", | |
"version" : 1, | |
"locktime" : 0, | |
"vin" : [ | |
{ | |
"txid" : "a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c", | |
"vout" : 0, | |
"scriptSig" : { | |
"asm" : "", | |
"hex" : "" | |
}, | |
"sequence" : 4294967295 | |
} | |
], | |
"vout" : [ | |
{ | |
"value" : 50.00000000, | |
"n" : 0, | |
"scriptPubKey" : { | |
"asm" : "OP_DUP OP_HASH160 3744841e13b90b4aca16fe793a7f88da3a23cc71 OP_EQUALVERIFY OP_CHECKSIG", | |
"hex" : "76a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac", | |
"reqSigs" : 1, | |
"type" : "pubkeyhash", | |
"addresses" : [ | |
"mkZBYBiq6DNoQEKakpMJegyDbw2YiNQnHT" | |
] | |
} | |
} | |
] | |
} | |
If we're happy, we'll sign. We need to provide the scriptpubkey of the | |
inputs we're signing so our offline wallet knows which of its keys | |
to use. | |
[offline]$ bitcoind signrawtransaction 01000000010c432f4fb3e871a8bda638350b3d5c698cf431db8d6031b53e3fb5159e59d4a90000000000ffffffff0100f2052a010000001976a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac00000000 '[{"txid":"a9d4599e15b53f3eb531608ddb31f48c695c3d0b3538a6bda871e8b34f2f430c","vout":0,"scriptPubKey":"76a914dd40dedd8f7e37466624c4dacc6362d8e7be23dd88ac"}]' | |
{ | |
"hex" : "01000000010c432f4fb3e871a8bda638350b3d5c698cf431db8d6031b53e3fb5159e59d4a9000000006b48304502201123d735229382f75496e84ae5831871796ef78726805adc2c6edd36d23e7210022100faceab822a4943309c4b6b61240ae3a9e18ed90a75117c5dc4bfd8f7e17a21d301210367ce0a1c3b3e84cece6dad1a181d989d8e490b84f5431a1f778a88b284c935e6ffffffff0100f2052a010000001976a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac00000000", | |
"complete" : true | |
} | |
Then we'll carry the transaction over to the online wallet and | |
announce it: | |
[online]$ bitcoind sendrawtransaction 01000000010c432f4fb3e871a8bda638350b3d5c698cf431db8d6031b53e3fb5159e59d4a9000000006b48304502201123d735229382f75496e84ae5831871796ef78726805adc2c6edd36d23e7210022100faceab822a4943309c4b6b61240ae3a9e18ed90a75117c5dc4bfd8f7e17a21d301210367ce0a1c3b3e84cece6dad1a181d989d8e490b84f5431a1f778a88b284c935e6ffffffff0100f2052a010000001976a9143744841e13b90b4aca16fe793a7f88da3a23cc7188ac00000000 | |
7822dda72d9bf421d2f3eedc678bf58c6e4c10cdd047b9e137559ad384933ef5 | |
And we can see the online wallet has been paid: | |
[online]$ bitcoind listtransactions "" 1 | |
[ | |
{ | |
"account" : "", | |
"address" : "mkZBYBiq6DNoQEKakpMJegyDbw2YiNQnHT", | |
"category" : "receive", | |
"amount" : 50.00000000, | |
"confirmations" : 0, | |
"txid" : "7822dda72d9bf421d2f3eedc678bf58c6e4c10cdd047b9e137559ad384933ef5", | |
"time" : 1344221517 | |
} | |
] |
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