Sign Transaction Bitcoin with Openssl

I created Legacy address in testnet enviroment.

Code:

$ openssl ecparam -genkey -name secp256k1 -rand /dev/urandom -out chiave_priv.pem
-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIIec9IrjQkpFhCAqMMNHQuU/6X7+DDH7p/TPr2on9j+XoAcGBSuBBAAK
oUQDQgAEJNcNWmojf5IU23BoNL6mG1VLcV08UAqXp/YrE6AbMkaVj05xJJCPg2FN
wu/j5c/5zp6GoBla+XuYagwHl0VwAQ==
-----END EC PRIVATE KEY-----

$ openssl ec -in chiave_priv.pem -outform DER|tail -c +8|head -c 32 |xxd -p -c 32 > btc_priv.key
879cf48ae3424a4584202a30c34742e53fe97efe0c31fba7f4cfaf6a27f63f97

It's my private key WIF

Code:

cS8KGbfbAxW6DLWvDQAfR4ZPXC2yJVXa7Qj4gYrFZNNGcWtbyPJ6

it is my compressed public key

Code:

0324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246

it's my transaction data that I want to sign with my private key

Code:

0200000001bc010c04e1c44a991760fa1cb7af1076bf755077d1cba60d3d4ca3f0de670d210000000000ffffffff01c0aff629010000001976a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac00000000

I know that I have to do double sha256

Code:

$ printf 0200000001bc010c04e1c44a991760fa1cb7af1076bf755077d1cba60d3d4ca3f0de670d210000000000ffffffff01c0aff629010000001976a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac00000000 | xxd -r -p | sha256sum -b | xxd -r -p | sha256sum -b > a.txt

Now Sign it (maybe here the error?)

Code:

$ openssl dgst -sha256 -hex -sign chiave_priv.pem a.txt
EC-SHA256(a.txt)= 30440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f7

Create ScriptSig

- 6A ScriptSig length => 212 char hex
- 47 Signature Length+SIGHHASH => 142 char hex
- < signature > 01
- 01 => SIGHASH_ALL
- 21 Public key length => 66 char hex
- < public key >

Below you can find the whole transaction data

Code:

0200000001bc010c04e1c44a991760fa1cb7af1076bf755077d1cba60d3d4ca3f0de670d21000000006A4730440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f701210324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246ffffffff01c0aff629010000001976a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac00000000

When I try to sentransaction, I get a error

Code:

$ bitcoin-cli sendrawtransaction 0200000001bc010c04e1c44a991760fa1cb7af1076bf755077d1cba60d3d4ca3f0de670d21000000006A4730440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f701210324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246ffffffff01c0aff629010000001976a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac00000000
error code: -26
error message:
mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation) (code 16)

Decoderawtransaction:

Code:

bitcoin-cli decoderawtransaction 0200000001bc010c04e1c44a991760fa1cb7af1076bf755077d1cba60d3d4ca3f0de670d21000000006A4730440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f701210324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246ffffffff01c0aff629010000001976a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac00000000
{
"txid": "3f360942dca166a75397cbc3f481771bea8f1c2b0c79313b034fb067882b3b36",
"hash": "3f360942dca166a75397cbc3f481771bea8f1c2b0c79313b034fb067882b3b36",
"version": 2,
"size": 191,
"vsize": 191,
"weight": 764,
"locktime": 0,
"vin": [
{
"txid": "210d67def0a34c3d0da6cbd1775075bf7610afb71cfa6017994ac4e1040c01bc",
"vout": 0,
"scriptSig": {
"asm": "30440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f7[ALL] 0324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246",
"hex": "4730440220113f4da0dab33c850b13c3f8e8239acdb9d474808d9c65e91a9304c4573ac3fc0220514df1aaf115535de6e3a7da19011b416b84bd2ec8737958d2d97c6eed6985f701210324d70d5a6a237f9214db706834bea61b554b715d3c500a97a7f62b13a01b3246"
},
"sequence": 4294967295
}
],
"vout": [
{
"value": 49.99000000,
"n": 0,
"scriptPubKey": {
"asm": "OP_DUP OP_HASH160 f6b61a355d427c892e51bdb261d4f56c4e93b16f OP_EQUALVERIFY OP_CHECKSIG",
"hex": "76a914f6b61a355d427c892e51bdb261d4f56c4e93b16f88ac",
"reqSigs": 1,
"type": "pubkeyhash",
"addresses": [
"n41SfwRvQD7tXJsbZsEcDWKFQ7DLYi3P7i"
]
}
}
]
}