Unsigned bitcoin transaction

This is not how Bitcoin works. Bitcoin does not use an accounts system nor does it use addresses on a protocol level. Spending Bitcoin means.
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Index is the specific output in the referenced transaction.

ScriptSig is the first half of a script discussed in more detail later. The script contains two components, a signature and a public key.

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The public key must match the hash given in the script of the redeemed output. The public key is used to verify the redeemers signature, which is the second component. More precisely, the second component is an ECDSA signature over a hash of a simplified version of the transaction. It, combined with the public key, proves the transaction was created by the real owner of the bitcoins in question. Various flags define how the transaction is simplified and can be used to create different types of payment.

An output contains instructions for sending bitcoins. ScriptPubKey is the second half of a script discussed later. There can be more than one output, and they share the combined value of the inputs. Because each output from one transaction can only ever be referenced once by an input of a subsequent transaction, the entire combined input value needs to be sent in an output if you don't want to lose it.

If the input is worth 50 BTC but you only want to send 25 BTC, Bitcoin will create two outputs worth 25 BTC: one to the destination, and one back to you known as " change ", though you send it to yourself. Any input bitcoins not redeemed in an output is considered a transaction fee ; whoever generates the block can claim it by inserting it into the coinbase transaction of that block.

To verify that inputs are authorized to collect the values of referenced outputs, Bitcoin uses a custom Forth-like scripting system.

The input's scriptSig and the referenced output's scriptPubKey are evaluated in that order , with scriptPubKey using the values left on the stack by scriptSig. The input is authorized if scriptPubKey returns true. Through the scripting system, the sender can create very complex conditions that people have to meet in order to claim the output's value. For example, it's possible to create an output that can be claimed by anyone without any authorization. It's also possible to require that an input be signed by ten different keys, or be redeemable with a password instead of a key.

It is possible to design more complex types of transactions, and link them together into cryptographically enforced agreements. These are known as Contracts. A Bitcoin address is only a hash, so the sender can't provide a full public key in scriptPubKey. Each map consists of a sequence of key-value records, terminated by a 0x00 byte [1]. This integer must be serialized in most significant byte order.

The transaction in network serialization. The scriptSigs and witnesses for each input must be empty. The transaction must be in the old serialization format without witnesses. The 78 byte serialized extended public key as defined by BIP Extended public keys are those that can be used to derive public keys used in the inputs and outputs of this transaction.

It should be the public key at the highest hardened derivation index so that the unhardened child keys used in the transaction can be derived. Once you have Armory installed on the offline computer, you create a new wallet. The nature of Armory wallets is that the online computer will always generate the exact same addresses as the offline computer, but the online computer cannot spend any of the funds!

Important: Make a paper backup!

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Connect a printer via USB or copy the paper backup information by hand. Make one or two copies, and store in a secure place. This is a permanent backup of every address your wallet will ever create! Double click on the wallet and click on Create Watching-Only Copy on the right menu.

Load Armory on online computer, and select Import Wallet in the upper-right corner of the main window. Import the wallet file on the USB drive. In the wallet-properties dialog, click on Belongs To , and click the checkbox that says This wallet is mine. This makes sure that any funds in this wallet are part of your global balance.

Now that the wallets are setup, you can use the watching-only wallet exactly the same way as a regular wallet, except Bitcoins cannot be sent from it.

Use the Receive Bitcoins button to generate addresses for receiving payments, and incoming transactions will show up in the ledger with a slightly different color than your other wallets. On the online computer, click the Offline Transactions button on the right, below the logo.

Select Create New Offline Transaction. A window will open with the unsigned version of the transaction. Load the file from the USB key, then press the Sign button. A confirmation window will appear. Verify the confirmation details before you sign it! Click Save to file…. Eject the USB key and plug it into the online computer.