item is hashed. Last updated: 29th January 2018, simple version : If I want to send some of my bitcoin to you, I publish my intention and the nodes scan the entire bitcoin network to validate that I 1) have the bitcoin that I want to send, and. sig pubKey OP_checksig Equality is checked between the top two stack items. ScriptSig is the first half of a script (discussed in more detail later). script script: OP_m pubKey1. But if you change so much as a comma, youll get a completely different 64-character string. sig pubKey OP_DUP OP_hash160 pubKeyHash OP_equalverify OP_checksig Constants are added to the stack.
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The public key is used to verify the redeemers signature, which is the second component. Getting a bit more complicated: My bitcoin wallet doesnt actually hold my bitcoin. Checking process: Stack Script Description Empty. With this information, the program spits out a digital signature, which gets sent out to the network for validation. Pay-to-Pubkey-hash addresses are similarly a 20-byte hash of the public key. So, if one small part of the previous block was tampered with, the current blocks hash would have to change (remember that one tiny change in the input of the hash function changes the output).