[Dev] Feathercoin 0.9.6.2 * Maintenance fix, build & upgrade issues notes.

Wellenreiter

@wrapper said in [Dev] Feathercoin 0.9.6.2 * Maintenance fix, build & upgrade issues notes.:

[FAQ] Is it trivial to change a Feathercoin portable wallet file to libdb 4.8?

Version 4.8 is not a requirement, just a recommendation. You can compile your own version and use newer versions of BDB by passing --with-incompatible-bdb to configure.

The main reason it is discouraged is because it breaks compatibility with the pre-built binaries. If you’re building from source you may not care.

But even if you do, it is trivial to convert your wallet back to a 4.8 wallet if you’re stuck with a 5.1 or 5.3 one. Use the bdb tools (packages db4.8-util db5.1-util on Ubuntu):

Code:
db5.1_dump wallet.dat.db5 | db4.8_load wallet.dat.db4
[Ref:]
https://bitcointalk.org/index.php?topic=502482.0

Well if one needs to convert the db, it would be easier to export the private keys, compile a wallet with the desired bdb version and import the private keys again.

Our precompiled Linux binaries contained in the installation packages care compiled with the default bdb contained in the distributions, so they will work on a given system/distribution.

wrapper

@Wellenreiter said in [Dev] Feathercoin 0.9.6.2 * Maintenance fix, build & upgrade issues notes.:

Well if one needs to convert the db, it would be easier to export the private keys, compile a wallet with the desired bdb version and import the private keys again.

Good idea but (re: Catch22) I can’t read the wallet.dat to export the private keys, as it says it is corrupt.

Wellenreiter

@wrapper

Always do backups in time ;)
you are in the worst situation, that can happen…

wrapper

A new version of zxing-cpp (zebra crossing QR code library), has been released.

https://github.com/glassechidna/zxing-cpp/pull/57

*   Installation working as a configuration package
*   Fix source listing to not use GLOB per CMake recommendation. Files
    are listed explicitly in source_files.cmake so that if file listing
    changes, CMake can detect it and regenerate as needed.
*   Added debug postfix for libs for side-by-side installation of different
    build variants (libzxing.lib and libzxing-debug.lib on Windows)

Notes:

*  Proper versioning is not being done in the installation config package. If a version is known, it should be added.
*  I had to comment out the windows-specific stuff (core/win32) because it caused compiler issues in Windows SDK headers.

wrapper

Sync test from Bootstrap.dat 0.9.6.2 – Debug.log spam messages 8.5GB 35-hours

Needs further investigation

This message It has been reported as superflous error, it does not seem to indicate a fault. It incorrectly specified error message.

ERROR: matches claimed amount, CheckProofOfWork() : hash doesn’t match nBits
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1502

Need “removing” from release build

FindStealthTransactions() tx:1a6d82536f8800f9535af0d921c9c4b0bd5ed63f7ed98d496ea489a3c96199d6,BOOST_$
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L1961

txout scriptPubKey
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L1985

txout hash =
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L1986

ProcessBlock: ACCEPTED
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L3265

ProcessBlock: Preliminary checks
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L3198

AcceptBlockHeader,nHeight=
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L2936

GetNextWorkRequired pindexLast
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1313

GetNextWorkRequired the next block Height=14138
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1314

GetNextWorkRequired fork
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1323

ConnectBlock hashPrevBlock=
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1952

ConnectBlock view.GetBestBlock()=
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1953

AddToWalletIfInvolvingMe,hash=5
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L708

ERROR: ProcessBlock() : already have block 528
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L3193

BOOST_FOREACH nOutputIdOuter=1 ,find txout…
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L708

txout scriptPubKey= OP_DUP OP_HASH160
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/wallet.cpp#L1985

Difficulty rules regular blocks
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L3193

GetNextWorkRequired(), nActualTimespan = 4 before bounds
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1383

RETARGET: nActualTimespanShort = 86, nActualTimespanMedium = 71, nActualTimespanLong = 65, nActualTimeSpanAvg = 74, nActualTimespan (damped) = 63
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1442

RETARGET: nActualTimespan = 63 after bounds
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1465

RETARGET: nTargetTimespan = 60, nTargetTimespan/nActualTimespan = 0.9524
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1466

GetNextWorkRequired RETARGET
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1480

nTargetTimespan = 60 nActualTimespan = 63
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1481

Before: 1c05f94b 0000000005f94b00000000000000000000000000000000000000000000000000
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1482

After: 1c0645c1 000000000645c1f3333333333333333333333333333333333333333333333333
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L1483

UpdateTip: new best=90ff2216fefd3585d6227b9ad98742c2dee0799950f96008c739853aeaa00a91 height=762942 log2_work=57.908051 tx=2002507 date=2015-06-23 16:01:34 progress=0.476417
https://github.com/FeatherCoin/Feathercoin/blob/master-0.9/src/main.cpp#L2139

Wellenreiter

@wrapper said in [Dev] Feathercoin 0.9.6.2 * Maintenance fix, build & upgrade issues notes.:

A new version of zxing-cpp (zebra crossing QR code library), has been released.

Just triggered a build on the package repository.

wrapper

main.cpp#L1488

bool CheckProofOfWork(uint256 hash, unsigned int nBits)
{
    CBigNum bnTarget;
    bnTarget.SetCompact(nBits);

    // Check range
    if (bnTarget <= 0 || bnTarget > Params().ProofOfWorkLimit())
        return error("Check range CheckProofOfWork() : nBits below minimum work");

    // Check proof of work matches claimed amount
    //LogPrintf("CheckProofOfWork() hash=%s \n",hash.ToString().c_str());
    //LogPrintf("CheckProofOfWork() nBits=%i \n",nBits);
    //LogPrintf("CheckProofOfWork() bnTarget.getuint256=%s \n",bnTarget.getuint256().ToString().c_str());
    if (hash > bnTarget.getuint256())
        return error("matches claimed amount, CheckProofOfWork() : hash doesn't match nBits");

return true;

wrapper

First block with error message is block : 432000 (const int nForkFour = 432000;)

ERROR: matches claimed amount, CheckProofOfWork()

All blocks after that have the message, checked up to block 1877425

wrapper

Debug.log with additional getwork debug messages

2017-09-13 12:49:22 ProcessBlock: Preliminary checks
2017-09-13 12:49:22 CheckProofOfWork() hash=5e6ccf101129ccb808cea67cfbe94cf4784718214cfde7dc1909a0402ae1ef6d
2017-09-13 12:49:22 CheckProofOfWork() nBits=473517455
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=00000000394d8f00000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 ERROR: matches claimed amount, CheckProofOfWork() : hash doesn't match nBits
2017-09-13 12:49:22 CheckProofOfWork() hash=00000000058213077e5dc035dbe8a5425695dc8dce74806cbb2cdc225fafcb8e
2017-09-13 12:49:22 CheckProofOfWork() nBits=473517455
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=00000000394d8f00000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 AcceptBlockHeader,nHeight=436027
2017-09-13 12:49:22 GetNextWorkRequired pindexLast block Height=436026,nBits=473715109
2017-09-13 12:49:22 GetNextWorkRequired the next block Height=436027
2017-09-13 12:49:22 GetNextWorkRequired fork
2017-09-13 12:49:22 Difficulty rules regular blocks
2017-09-13 12:49:22 GetNextWorkRequired(), nActualTimespan = 15  before bounds
2017-09-13 12:49:22 RETARGET: nActualTimespanShort = 25, nActualTimespanMedium = 61, nActualTimespanLong = 61, nActualTimeSpanAvg = 49, nActua$
2017-09-13 12:49:22 CheckProofOfWork() hash=00000000058213077e5dc035dbe8a5425695dc8dce74806cbb2cdc225fafcb8e
2017-09-13 12:49:22 CheckProofOfWork() nBits=473517455
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=00000000394d8f00000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 CheckProofOfWork() hash=00000000058213077e5dc035dbe8a5425695dc8dce74806cbb2cdc225fafcb8e
2017-09-13 12:49:22 CheckProofOfWork() nBits=473517455
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=00000000394d8f00000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 CheckProofOfWork() hash=00000000058213077e5dc035dbe8a5425695dc8dce74806cbb2cdc225fafcb8e
2017-09-13 12:49:22 CheckProofOfWork() nBits=473517455
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=00000000394d8f00000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 ConnectBlock hashPrevBlock=a521017bff5487651b402d64e04b7a2c67972de92013976ddfc73409680a756b
2017-09-13 12:49:22 ConnectBlock view.GetBestBlock()=a521017bff5487651b402d64e04b7a2c67972de92013976ddfc73409680a756b
2017-09-13 12:49:22 AddToWalletIfInvolvingMe,hash=cf978ce4ae56e68df19853d101aa59f836b481ed49d430a081985a275c358f68 .
2017-09-13 12:49:22 FindStealthTransactions() tx:cf978ce4ae56e68df19853d101aa59f836b481ed49d430a081985a275c358f68,BOOST_FOREACH nOutputIdOuter$
2017-09-13 12:49:22 txout scriptPubKey= OP_DUP OP_HASH160 6016bc7b58ccc4f826213591cc8adfaebf922f6c OP_EQUALVERIFY OP_CHECKSIG
2017-09-13 12:49:22 txout hash = c7a5ccaede5d3271df6e5026bf80f2e7c6e895bf5a6d9b8f4f6a38536fcd3589
2017-09-13 12:49:22 UpdateTip: new best=3d352ee58088a8947481f692d1e23c77a301d8104458cae19f74e30faa65b01c  height=436027  log2_work=57.827711  $
2017-09-13 12:49:22 AddToWalletIfInvolvingMe,hash=cf978ce4ae56e68df19853d101aa59f836b481ed49d430a081985a275c358f68 .
2017-09-13 12:49:22 FindStealthTransactions() tx:cf978ce4ae56e68df19853d101aa59f836b481ed49d430a081985a275c358f68,BOOST_FOREACH nOutputIdOuter$
2017-09-13 12:49:22 txout scriptPubKey= OP_DUP OP_HASH160 6016bc7b58ccc4f826213591cc8adfaebf922f6c OP_EQUALVERIFY OP_CHECKSIG
2017-09-13 12:49:22 txout hash = c7a5ccaede5d3271df6e5026bf80f2e7c6e895bf5a6d9b8f4f6a38536fcd3589
2017-09-13 12:49:22 ProcessBlock: ACCEPTED
2017-09-13 12:49:22 ProcessBlock: Preliminary checks
2017-09-13 12:49:22 CheckProofOfWork() hash=0f97d9fef076fb1ab9d0c41c106a49f7a2017982ca27579162d6c358ac513af9
2017-09-13 12:49:22 CheckProofOfWork() nBits=473329684
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000036701400000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 ERROR: matches claimed amount, CheckProofOfWork() : hash doesn't match nBits
2017-09-13 12:49:22 CheckProofOfWork() hash=0000000009706efc0793c5b26d4a24488be0224a8cb4889c87e003bfbb8f8879
2017-09-13 12:49:22 CheckProofOfWork() nBits=473329684
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000036701400000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 AcceptBlockHeader,nHeight=436028
2017-09-13 12:49:22 GetNextWorkRequired pindexLast block Height=436027,nBits=473517455
2017-09-13 12:49:22 GetNextWorkRequired the next block Height=436028
2017-09-13 12:49:22 GetNextWorkRequired fork
2017-09-13 12:49:22 Difficulty rules regular blocks
2017-09-13 12:49:22 GetNextWorkRequired(), nActualTimespan = 38  before bounds
2017-09-13 12:49:22 RETARGET: nActualTimespanShort = 26, nActualTimespanMedium = 62, nActualTimespanLong = 61, nActualTimeSpanAvg = 49, nActualTimespan (damped) = 57
2017-09-13 12:49:22 CheckProofOfWork() hash=0000000009706efc0793c5b26d4a24488be0224a8cb4889c87e003bfbb8f8879
2017-09-13 12:49:22 CheckProofOfWork() nBits=473329684
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000036701400000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 CheckProofOfWork() hash=0000000009706efc0793c5b26d4a24488be0224a8cb4889c87e003bfbb8f8879
2017-09-13 12:49:22 CheckProofOfWork() nBits=473329684
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000036701400000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 CheckProofOfWork() hash=0000000009706efc0793c5b26d4a24488be0224a8cb4889c87e003bfbb8f8879
2017-09-13 12:49:22 CheckProofOfWork() nBits=473329684
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000036701400000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 ConnectBlock hashPrevBlock=3d352ee58088a8947481f692d1e23c77a301d8104458cae19f74e30faa65b01c
2017-09-13 12:49:22 ConnectBlock view.GetBestBlock()=3d352ee58088a8947481f692d1e23c77a301d8104458cae19f74e30faa65b01c
2017-09-13 12:49:22 AddToWalletIfInvolvingMe,hash=b89f5d1e8aedb165a3c0580e32837c76f6f2d7f6eaf03dbf3156d2eba00e5388 .
2017-09-13 12:49:22 FindStealthTransactions() tx:b89f5d1e8aedb165a3c0580e32837c76f6f2d7f6eaf03dbf3156d2eba00e5388,BOOST_FOREACH nOutputIdOuter=0 ,find txout...
2017-09-13 12:49:22 txout scriptPubKey= OP_DUP OP_HASH160 070be0e13966f496623c0fcbe3a0d4152e902aa1 OP_EQUALVERIFY OP_CHECKSIG
2017-09-13 12:49:22 txout hash = f2572e4760d154f7708b57f62678d48ee5648a9098202dbeb4c59892274d72dd
2017-09-13 12:49:22 UpdateTip: new best=d5459fc95d834862683a71cd6bde98a0b526b2ef55a60b1ff99a6d17aae29198  height=436028  log2_work=57.827711  tx=1509604  date=2014-10-29 15:41:32 progress=0.356094
2017-09-13 12:49:22 AddToWalletIfInvolvingMe,hash=b89f5d1e8aedb165a3c0580e32837c76f6f2d7f6eaf03dbf3156d2eba00e5388 .
2017-09-13 12:49:22 FindStealthTransactions() tx:b89f5d1e8aedb165a3c0580e32837c76f6f2d7f6eaf03dbf3156d2eba00e5388,BOOST_FOREACH nOutputIdOuter=0 ,find txout...
2017-09-13 12:49:22 txout scriptPubKey= OP_DUP OP_HASH160 070be0e13966f496623c0fcbe3a0d4152e902aa1 OP_EQUALVERIFY OP_CHECKSIG
2017-09-13 12:49:22 txout hash = f2572e4760d154f7708b57f62678d48ee5648a9098202dbeb4c59892274d72dd
2017-09-13 12:49:22 ProcessBlock: ACCEPTED
2017-09-13 12:49:22 ProcessBlock: Preliminary checks
2017-09-13 12:49:22 CheckProofOfWork() hash=2c7b236bbcb89e395243e153677f86d16ba9844395730a3c1f5eb00bd7a93cc0
2017-09-13 12:49:22 CheckProofOfWork() nBits=473151302
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000033b74600000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 ERROR: matches claimed amount, CheckProofOfWork() : hash doesn't match nBits
2017-09-13 12:49:22 CheckProofOfWork() hash=000000002010046f762ffa151be4d61323869f9bff6ee8955729cbfda8c0723c
2017-09-13 12:49:22 CheckProofOfWork() nBits=473151302
2017-09-13 12:49:22 CheckProofOfWork() bnTarget.getuint256=0000000033b74600000000000000000000000000000000000000000000000000
2017-09-13 12:49:22 AcceptBlockHeader,nHeight=436029
2017-09-13 12:49:22 GetNextWorkRequired pindexLast block Height=436028,nBits=473329684
2017-09-13 12:49:22 GetNextWorkRequired the next block Height=436029
2017-09-13 12:49:22 GetNextWorkRequired fork
2017-09-13 12:49:22 Difficulty rules regular blocks
2017-09-13 12:49:22 GetNextWorkRequired(), nActualTimespan = 43  before bounds
2017-09-13 12:49:22 RETARGET: nActualTimespanShort = 27, nActualTimespanMedium = 61, nActualTimespanLong = 61, nActualTimeSpanAvg = 49, nActualTimespan (damped) = 57

wrapper

The first time it does preliminary checks it says hash is different to what it then goes straight through CheckProofOfWork()…

hash=d31a46d558974e7b07c6f63a594bfba0fa435659ebca05108f669f58a6d34cfc

then :

hash=000000001bc0c162a3676627559a0ec6f62dd9876ad63d8382859d2ead802875

2017-09-13 12:48:46 CheckProofOfWork() hash=d31a46d558974e7b07c6f63a594bfba0fa435659ebca05108f669f58a6d34cfc 
2017-09-13 12:48:46 CheckProofOfWork() nBits=472148865 
2017-09-13 12:48:46 CheckProofOfWork() bnTarget.getuint256=00000000246b8100000000000000000000000000000000000000000000000000 
2017-09-13 12:48:46 ERROR: matches claimed amount, CheckProofOfWork() : hash doesn't match nBits
2017-09-13 12:48:46 CheckProofOfWork() hash=000000001bc0c162a3676627559a0ec6f62dd9876ad63d8382859d2ead802875

Wellenreiter

Neoscrypt is little endian, may be a byte swap will do the trick.

Was fighting with that for p2pool already.

Here is the python code snippet to get it running in p2pool.

 getwork._swap4(pack.IntType(256).pack(x['previous_block'])).encode('hex'), # prevhash
        x['coinb1'].encode('hex'), # coinb1
        x['coinb2'].encode('hex'), # coinb2
        [pack.IntType(256).pack(s).encode('hex') for s in x['merkle_link']['branch']], # merkle_branch
        getwork._swap4(pack.IntType(32).pack(x['version'])).encode('hex'), # version
        getwork._swap4(pack.IntType(32).pack(x['bits'].bits)).encode('hex'), # nbits
        getwork._swap4(pack.IntType(32).pack(x['timestamp'])).encode('hex'), # ntime

Definition of swap4:

def _swap4(s):
if len(s) % 4:
    raise ValueError()
return ''.join(s[x:x+4][::-1] for x in xrange(0, len(s), 4))

Not sure, how to realize that in C++

wrapper

Testing 0.9.6.2- head

@Wellenreiter @Bushstar
I have tested head and am unable to compile with --qrcodes=yes

undefined reference to ` QRCodeDialog::QRCodeDialog(QString const&, QString const&, bool, QWidget*)’

Wellenreiter

try --with-gui=qt5

qt4 support is broken in 0.9x, but tested first and then selected by configure.

wrapper

I am compiling with the standard switches, exactly the same as before, except now qrcodes=no

./configure --with-gui=qt5 --enable-tests=no --enable-upnp-default --with-qrcode=no --enable-wallet=yes --enable-shared --disable-hardening LDFLAGS=“-L${BDB_PREFIX}/lib/” CPPFLAGS=“-I${BDB_PREFIX}/include/” CXXFLAGS=“$CXXFLAGS -fPIC -m64 -std=c++11”

Wellenreiter

Then check, if you have a qrcodedialog in the …/qt/forms directory.

wrapper

Fixed.

~~I’ve git cloned from head. There is nothing missing and I haven’t done anything to it except add my build.sh and change my compile to qrcodes=no to get it compile…~~

wrapper

Bitcoin 0.9.x Backports 2

#68

https://github.com/bitcoin/bitcoin/commit/0a94661e8db94e84ecbf1ea45a51fb3c7fb77283

Disable SSLv3 (in favor of TLS) for the RPC client and server.

TLS is subject to downgrade attacks when SSLv3 is available, and
SSLv3 has vulnerabilities.

The popular solution is to disable SSLv3. On the web this breaks
some tiny number of very old clients. While Bitcoin RPC shouldn’t
be exposed to the open Internet, it also shouldn’t be exposed to
really old SSL implementations, so it shouldn’t be a major issue
for us to disable SSLv3.

There is more information on the downgrade attacks and disabling
SSLv3 at https://disablessl3.com/ .

src/rpcclient.cpp#L43

-  context.set_options(ssl::context::no_sslv2);

+  context.set_options(ssl::context::no_sslv2 | ssl::context::no_sslv3);

src/rpcserver.cpp

-    rpc_ssl_context->set_options(ssl::context::no_sslv2);

+    rpc_ssl_context->set_options(ssl::context::no_sslv2 | ssl::context::no_sslv3);

wrapper

Consensus: guard against openssl’s new strict DER checks

 0.9 (#106)

New versions of OpenSSL will reject non-canonical DER signatures. However,
it’ll happily decode them. Decode then re-encode before verification in order
to ensure that it is properly consumed.

Github-Pull: #5634

https://github.com/bitcoin/bitcoin/commit/b8e81b7ccd4490155e3345fc73346ff8c3a77524

-        // -1 = error, 0 = bad sig, 1 = good

-        if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1)

-        return true;

+        // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
        unsigned char *norm_der = NULL;
+        ECDSA_SIG *norm_sig = ECDSA_SIG_new();
+        const unsigned char* sigptr = &vchSig[0];
+        d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size());
+        int derlen = i2d_ECDSA_SIG(norm_sig, &norm_der);
+        ECDSA_SIG_free(norm_sig);
+        if (derlen <= 0)



+
+        // -1 = error, 0 = bad sig, 1 = good
+        bool ret = ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
+        OPENSSL_free(norm_der);
+        return ret;

wrapper

@Bushstar - ufo fails to build on Ubuntu, here is the fix for the issue …

https://github.com/FeatherCoin/Feathercoin/pull/139/commits/35e34280cf929d086e72e9d3ac6719c8a2fdd559

chainparams boost version fixes :

chainparams.cpp ~L73

      //base58Prefixes[PUBKEY_ADDRESS] = list_of(27);
        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,27); 
          // base58Prefixes[SCRIPT_ADDRESS] = list_of(5);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
        // base58Prefixes[SECRET_KEY] =     list_of(128);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,128);
        // base58Prefixes[EXT_PUBLIC_KEY] = list_of(0x04)(0x88)(0xB2)(0x1E);
        base58Prefixes[EXT_PUBLIC_KEY] = boost::assign::list_of(0x04)(0x88)(0xB2)(0x1E).convert_to_container<std::vector<unsigned char> >();
        // base58Prefixes[EXT_SECRET_KEY] = list_of(0x04)(0x88)(0xAD)(0xE4);
        base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x88)(0xAD)(0xE4).convert_to_container<std::vector<unsigned char> >();

chainparams.cpp ~153

        // base58Prefixes[PUBKEY_ADDRESS] = list_of(111);
        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
        // base58Prefixes[SCRIPT_ADDRESS] = list_of(196);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        // base58Prefixes[SECRET_KEY]     = list_of(239);
        base58Prefixes[SECRET_KEY]     = std::vector<unsigned char>(1,2399);
        // base58Prefixes[EXT_PUBLIC_KEY] = list_of(0x04)(0x35)(0x87)(0xCF);
        base58Prefixes[EXT_PUBLIC_KEY] = boost::assign::list_of(0x04)(0x35)(0x87)(0xCF).convert_to_container<std::vector<unsigned char> >();
        // base58Prefixes[EXT_SECRET_KEY] = list_of(0x04)(0x35)(0x83)(0x94);
        base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x35)(0x83)(0x94).convert_to_container<std::vector<unsigned char> >();

wrapper

main.cpp Logprintf \n

Action

main.cpp - return LogPrintf CheckBlockHeader() to being error message.

Leave others as is.

LogPrintf("CheckBlockHeader() : block with timestamp before last checkpoint");

LogPrintf("| ");
LogPrintf("| ");
LogPrintf("| ");

LogPrintf("%s : Deserialize or I/O error - %s", __func__, e.what());

wallet.cpp

Actioin Fix all missing \n in LogPrintf() errors

  // if (fDebug) LogPrintf("FindStealthTransactions() tx:%s,", tx.GetHash().GetHex().c_str());
  // if (fDebug) LogPrintf("StealthSecret.....");
  LogPrintf("CommitTransaction() : Error: Transaction not valid");
  LogPrintf("SendMoney() : %s", strError);

rpcserver.cpp

Action left as original

 //   LogPrintf("%s: Warning: %s when cancelling acceptor", __func__, ec.message());
 //   LogPrintf("%s: Warning: %s when cancelling timer", __func__, ec.message());

rpcdump.cpp

Action Correct message reference to Bitcoin. Correct / check - Translation text.

 file << strprintf("# Wallet dump created by Bitcoin %s (%s)\n", CLIENT_BUILD, CLIENT_DATE);

multisigdialog.cpp

Action No action, dev can fix when they uncomment.

 // if (fDebug)printf("updateAddressBalance GetDepthInMainChain %d\n", wtx.GetDepthInMainChain());
// if (fDebug)printf("updateAddressBalance nValue %s\n", BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), txout.nValue).toStdString().c_str());
// if (fDebug)printf("updateAddressBalance nAmount %s\n", BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), nAmount).toStdString().c_str());

miner.cpp

Action Most left as is, couple reviewed and commented out.

LogPrintf("COrphan(hash=%s, dPriority=%.1f, dFeePerKb=%.1f)\n", ptx->GetHash().ToString(), dPriority, dFeePerKb);
 LogPrintf("   setDependsOn %s\n", hash.ToString());
    bool fPrintPriority = GetBoolArg("-printpriority", false);
 LogPrintf("ERROR: mempool transaction missing input\n");
        if (fPrintPriority)
            LogPrintf("priority %.1f feeperkb %.1f txid %s\n", dPriority, dFeePerKb, tx.GetHash().ToString());
 LogPrintf("CreateNewBlock(): total size %u\n", nBlockSize);
 //// debug print
 LogPrintf("FeathercoinMiner:\n");
 LogPrintf("proof-of-work found  \n  hash: %s  \ntarget: %s\n", hash.GetHex(), hashTarget.GetHex());
 pblock->print();
 LogPrintf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue));
 LogPrintf("FeathercoinMiner started\n");
 LogPrintf("Running FeathercoinMiner with %u transactions in block (%u bytes)\n", pblock->vtx.size(),
 LogPrintf("hashmeter %6.0f khash/s\n", dHashesPerSec/1000.0);
 LogPrintf("FeathercoinMiner terminated\n");

util.cpp

Action No action left as is.

   LogPrintf("%+d  ", n);
   LogPrintf("|  ");