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i'm studying Bitcoin: A Peer-to-Peer Electronic Cash System Satoshi Nakamoto

and this paper introduce a transaction model. (above picture) enter image description here

but i don't understand what is 'Hash' means exactly

i think Hash is same Bitcoin API JSON-RPC - signrawtransaction function

it means hash(txid + owner's public key)? then what method used hash function?

or hash(result of signrawtransaction + RIPEMD160(sha256(pub k)) )? then what method used to hash?

1 Answer 1

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The hash refers to the signature hash, to which all tx data except for the input script is committed to (unless you are signing with a sighash flag other than ALL).

The signature hash is what is signed with ECDSA to produce the signature.

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  • This might help: teachbitcoin.io/presentations/transaction_build.html#/5
    – James C.
    Commented Jan 17, 2019 at 10:11
  • thanks. but i have one more question. in the picture of center(1 and 2's transaction), why Hash(Owner 2's pub K + signature hash) is Owner 1's Signature? Assuming the signature of 1 is correct, why 1's Sign arrow not heads Hash, point out 1's Signature? Commented Jan 17, 2019 at 10:39
  • Thats because the transaction output is intended for owner 2. His pubkey is commited to the 2nd transaction. Specifically it is inthe output of tx2. He has the private key 2 that can spend it.
    – James C.
    Commented Jan 17, 2019 at 10:47
  • Its the original paper, but the illustration isn’t the most intuitive depiction.
    – James C.
    Commented Jan 17, 2019 at 10:48

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