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I'm trying to learn more about bitcoin and I'm trying to decode a transaction I made to myself on testnet and I can't seem to figure out a couple of things

Here is the output of getrawtransaction: getrawtransaction 'f013fd7f27a8c78fd52ad95253e7330dd7e5c6490f480cecd95359cfb1abcbdd' true

{
  "txid": "f013fd7f27a8c78fd52ad95253e7330dd7e5c6490f480cecd95359cfb1abcbdd",
  "hash": "f6f699d7587a455e516be97b81b79d318d40ca9a8cc4f3382e4ba355808f7c83",
  "version": 2,
  "size": 223,
  "vsize": 142,
  "weight": 565,
  "locktime": 2133079,
  "vin": [
    {
      "txid": "246f7eb126789462a13b56658fc8095118ea9499b0c41ca5402fa38f97681d2b",
      "vout": 0,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "txinwitness": [
        "304402200eb3153139da95c29755baaddb1f8038ad1bd850f46b56d467875d91eb49599502204a19b6798bbdbd019f0bcf63a3412d4f99f923b19a33377c714d06a6f77a71fa01",
        "036abeb6881115996db7d8fc9845adf6dabc66e03ca04ff9ff6d15d64fed1cf4b1"
      ],
      "sequence": 4294967293
    }
  ],
  "vout": [
    {
      "value": 0.00009858,
      "n": 0,
      "scriptPubKey": {
        "asm": "OP_HASH160 07a715962bfe8aec6637ea4abe38e412aa8f9f77 OP_EQUAL",
        "hex": "a91407a715962bfe8aec6637ea4abe38e412aa8f9f7787",
        "address": "2MswgsrCPRvvB6umFyCYJB6L5FFjnoce2AS",
        "type": "scripthash"
      }
    },
    {
      "value": 0.00010000,
      "n": 1,
      "scriptPubKey": {
        "asm": "0 f864afee2f6d17a22c420ee61ea21aff5d76ebd4",
        "hex": "0014f864afee2f6d17a22c420ee61ea21aff5d76ebd4",
        "address": "tb1qlpj2lm30d5t6ytzzpmnpags6lawhd675fh8265",
        "type": "witness_v0_keyhash"
      }
    }
  ],
  "hex": "020000000001012b1d68978fa32f40a51cc4b09994ea185109c88f65563ba162947826b17e6f240000000000fdffffff02822600000000000017a91407a715962bfe8aec6637ea4abe38e412aa8f9f77871027000000000000160014f864afee2f6d17a22c420ee61ea21aff5d76ebd40247304402200eb3153139da95c29755baaddb1f8038ad1bd850f46b56d467875d91eb49599502204a19b6798bbdbd019f0bcf63a3412d4f99f923b19a33377c714d06a6f77a71fa0121036abeb6881115996db7d8fc9845adf6dabc66e03ca04ff9ff6d15d64fed1cf4b1578c2000"
}

Questions:

  1. The address I sent some test BTC to is 2MswgsrCPRvvB6umFyCYJB6L5FFjnoce2AS. But, I don't know what 07a715962bfe8aec6637ea4abe38e412aa8f9f77 is and I can't seem to duplicate it. I can't even duplicate 2MswgsrCPRvvB6umFyCYJB6L5FFjnoce2AS. By duplicate I mean I can't seem to recreate that label given the public key from my wallet. The public key is 02381296c094c7284621bf3b25fb086a531d5035b7982604d15f9223cda758c7bc, so from that shouldn't I be able to take the RIPEMD160 HASH, prepend add 0x6f, take the double hash, take the first 4 bytes, then encode that into base-58 (version + hash + checksum) and get the above address? What am I doing wrong because I'm not getting that.
  2. What are the 2 bytes after the first 4 bytes (Version)? Bytes 5-6, which is 0001?
  3. What about bytes 113-114? Which is 0247 (in the raw hex dump)? What does that represent?

Edit: output from testnet wallet:

getaddressinfo "2MswgsrCPRvvB6umFyCYJB6L5FFjnoce2AS"


{
  "address": "2MswgsrCPRvvB6umFyCYJB6L5FFjnoce2AS",
  "scriptPubKey": "a91407a715962bfe8aec6637ea4abe38e412aa8f9f7787",
  "isscript": true,
  "iswitness": false,
  "script": "witness_v0_keyhash",
  "hex": "00145ec830fe309c79964f739c66bdc0619d754a4e33",
  "pubkey": "02381296c094c7284621bf3b25fb086a531d5035b7982604d15f9223cda758c7bc",
  "embedded": {
    "isscript": false,
    "iswitness": true,
    "witness_version": 0,
    "witness_program": "5ec830fe309c79964f739c66bdc0619d754a4e33",
    "pubkey": "02381296c094c7284621bf3b25fb086a531d5035b7982604d15f9223cda758c7bc",
    "address": "tb1qtmyrpl3sn3uevnmnn3ntmsrpn4655n3npp07k4",
    "scriptPubKey": "00145ec830fe309c79964f739c66bdc0619d754a4e33"
  },
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1 Answer 1

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  1. Addresses that start with 2 on testnet or more precisely scripts that are like OP_HASH160 <hash> OP_EQUAL are P2SH scripts and the hash is created by computing HASH160 of a redeem script. Your redeem script seems to be a P2WPKH one which makes your address a P2SH-P2WPKH address. Your redeem script that has to be hashed is OP_0 <160-bit hash of public key>
  2. It is a indicator that this transaction contains witnesses. See BIP-141.
  3. 02 is indicating there are 2 witness items and 47 is the size of the first witness item using compact integer format.
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  • Hey, thanks for the answer. So, you mean do the RIPEMD160 hash of "0x00 + publicKey", which is the redeem script, then do the "RIPEMD160" of that, add the network prefix, double hash that, grab the first 4 bytes as checksum, then do base58checkencode? I'm still kinda lost on the exact steps. Here is the output from the testnet wallet for that address/label (see question above, I edited it)
    – btcnewb
    Commented Dec 29, 2021 at 3:51
  • 1
    @btcnewb Hash160 = SHA-256 followed by ripemd-160. The script hash is the hash160 of the redeem script. You prepend the version byte to that, compute the checksum as the double sha-256 hash of "version+script hash", append the first four bytes of that hash, then Base58 encode. The steps are similar to this procedure and this answer.
    – meshcollider
    Commented Dec 29, 2021 at 4:52

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