My address is 389CLh5Ect2i7U5116gqjBSLykYHRmdcgZ. In request from site i see this scriptPubKey, how i can generate this scriptPubKey from my Address {scriptPubKey: "a91446c443cc449d9e9a54a9e07a30dfd2ab1960a18f87", value: 60000} ?

If you have examples in javascript it will be good.


this is the partial answer, on the underlying logic. I cannot help with java script. The critical part would be the base58decoding, but it seems there are solutions already: https://www.npmjs.com/package/base58check

Underlying logic:

the scriptpubkey contains the RipeMD160 Hash, surrounded by some codes: a9 14 87. This is a P2SH address.

the meaning of the codes is:

a9 -> do a RipeMD160 on the top stack item
14 -> push hex 14 (decimal 20) bytes on stack
87 -> check if the top two stack elements are equal

From your address, you need four steps, to come to this goal:

1.) base58decode the address
2.) remove last 4 bytes (this is a checksum)
3.) remove the first two bytes (the network prefix
4.) surround the codes to it

effectivly the procedure is the revers of the standard "base58check encoding": which answers, how to come from a pubkey in hexformat to an address:

0: have a Private ECDSA Key
1: derive the Public ECDSA Key
2: do a SHA-256 of 1
3: RIPEMD-160 Hash of 2
4: add address prefix 0x00 for P2PKH, 0x05 for P2SH
5. sha256
6. another sha256
7. take first four Bytes from step 6 as checksum
8. append checksum from step 7 to the result from step4
9. encode Base58

--> your bitcoin address !

help while testing: http://gobittest.appspot.com/Address (hint: never put your production private keys into a webpage - you might/will loose the funds on it!)

  • scriptPubKey is static or dynamic ? Jan 8 '18 at 3:10
  • I am not sure what you mean by static or dynamic. The pubkey is derived from the private key via the ECDSA logic, then hashed, concatenated with a prefix and chcksummed, re-assembled and bas58encoded. There are other pubkey-scripts, which can be assembled dynamically, but not keys... Jan 8 '18 at 7:30

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