Decode script bitcoin

Introduction to Bitcoin Programming with BitcoinJS and Bitcoin Core

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The scriptSig is then sent to the execution stack again as two separate elements. Since the version byte is 0 and the witness program is 32 bytes it is interpreted as a P2WSH program. This triggers the execution of the witness stack. To follow along this tutorial. This 1 btc is the reward for whoever as the solution to the locking script.

Creates a public key and bitcoin address from a private key. Puts a transaction together, signs it, and prints the tx hex to the screen. This can then be sent to the network with the pushrawtransaction command in bitcoin-cli or to your own bitcoin node with. Similar to eztxbuilder. Use this to submit your results to the blockchain. The AddressFromPrivateKey function will help you. Put your own random string in to generate a private key. If you call the AddressFromPrivateKey function, it will return that address as a string, as well as give you the compressed public key and pay to witness pubkey hash script.

Save this address it starts with an "m". You'll need this to send the money to yourself. A block explorer is a website which watches the blockchain and parses out information about blocks, addresses, and transactions.

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You can use this blockexplorer to see what's happening on the Bitcoin testnet. I've created a transaction with one 70 outputs. The txid is the hash of the serialized transaction. The outputs of this transaction are all have the same address, which determines how they can be spent.

The private key for this pubkey-hash address is the double-sha of the string "mas. Claim an unspent output in this transaction. Please be nice and leave the rest of the outputs for other classmates! Using EZTxBuilder , make a transaction sending from the up-for-grabs transaction to your own address.

NewTxOut change the amount to less than the input amount. A few thousand less is enough of a fee.

Before we get to that though, we should have an idea of how calculations and operations happen in a bitcoin script. Before we continue with Script, it will be helpful to understand how a stack-based, reverse-polish system works. Now that this is done, how would this look like if it were a script? Just the appearance changes, the rest of the operation remains the same as shown above. If you want a primer on the different Opcodes that are used in a script then click here. Keep this in mind for future examples.

We are taking this example just to introduce you to an extremely important opcode, DUP aka duplicate. Transactions in bitcoin are a constant game of locking and unlocking. The idea of scriptPubKey is to offer a cryptographic puzzle which can only be unlocked via the corresponding scriptSig. Suppose, Alice wants to send Bob some bitcoin. Everyone in bitcoin has two keys:. The public key is cryptographically derived from the private key.

Now, in order to get money sent to them, everyone must have a public address. The reason why we do this is to make sure that you have an extra layer of protection, IF in the case that someone somehow figures out how to generate your private key using your public key which is infeasible. So, the final output is a bit hash. The proof that Bob uses to unlock the funds is his Digital Signature, which cryptographically derived from his private key.

Bob unlocks the input using his signature of scriptSig which includes his signature and his public key. In order to unlock the output and use his funds Bob concatenates or kinda joins the scriptSig and the scriptPubKey like this:.

Image Credit: CryptoCompare. The script right now looks like this:. When this entire process is done, Bob can unlock the transaction and gets access to his funds. You just went through an entire bitcoin transaction! Well, for that we need to look at the cryptography behind bitcoin. Elliptical curve cryptography is what is used by bitcoin, ethereum etc.

So what is an elliptical curve? An elliptical curve is any curve that satisfies the following equation:. Where x,y is a point on the curve and a and b are constants. There are infinite curves that you can make. The following is how one of these curves, in general, look like:. Suppose there are two points on the curve V and A. This will intersect the curve on a third point. We will call this third point X, and we will reflect it on the curve like this:. This is the additive property of the elliptical curve.

Interesting note. Now, what if we want to add a number to itself? Like suppose we have a point V, what do we do to find 2V?

decoderawtransaction (0.16.0 RPC)

We will run a tangent through V and intersect it at a point in the graph and then find the reflection of the point on the curve. That reflection will be 2V. This is also the multiplicative property of the graph because we are finding points which are basically the multiplication of an integer with the point itself.

Creating and Funding the P2SH

Now suppose we want to find 3V. We will join V and 2V and then reflect the point of intersection, like this:. You see how the points cycle across the graph? This is what gives it its security.

All multiplication done on the curve can be done very fast. Now suppose we have a point P and we want to find P. Instead of adding the number to itself times we can do the following:.

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So, instead of going through 99 steps you cut short the entire thing to just 8 steps. Whilst multiplication is fast, division is very slow.

We will have to manually go through the numbers one by one to find a value which satisfies the equation.

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