validation: check the specified number of blocks (off-by-one)
validation: check the specified number of blocks (off-by-one)

tecnovert/particl-core,rawodb/bitcoin,DigitalPandacoin/pandacoin,pataquets/namecoin-core,vertcoin/vertcoin,afk11/bitcoin,fanquake/bitcoin,prusnak/bitcoin,midnightmagic/bitcoin,h4x3rotab/BTCGPU,Flowdalic/bitcoin,MeshCollider/bitcoin,AkioNak/bitcoin,AkioNak/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,jtimon/bitcoin,JeremyRubin/bitcoin,yenliangl/bitcoin,Flowdalic/bitcoin,dscotese/bitcoin,Xekyo/bitcoin,droark/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,jnewbery/bitcoin,qtumproject/qtum,rnicoll/bitcoin,Xekyo/bitcoin,anditto/bitcoin,ericshawlinux/bitcoin,andreaskern/bitcoin,CryptArc/bitcoin,DigitalPandacoin/pandacoin,joshrabinowitz/bitcoin,mm-s/bitcoin,guncoin/guncoin,GlobalBoost/GlobalBoost,jonasschnelli/bitcoin,GroestlCoin/bitcoin,lateminer/bitcoin,vertcoin/vertcoin,jlopp/statoshi,achow101/bitcoin,joshrabinowitz/bitcoin,jnewbery/bitcoin,mitchellcash/bitcoin,ericshawlinux/bitcoin,lateminer/bitcoin,Christewart/bitcoin,Bushstar/UFO-Project,litecoin-project/litecoin,CryptArc/bitcoin,bespike/litecoin,h4x3rotab/BTCGPU,bespike/litecoin,monacoinproject/monacoin,yenliangl/bitcoin,mitchellcash/bitcoin,rnicoll/dogecoin,particl/particl-core,FeatherCoin/Feathercoin,droark/bitcoin,bitcoinknots/bitcoin,jmcorgan/bitcoin,lateminer/bitcoin,rnicoll/bitcoin,vertcoin/vertcoin,kazcw/bitcoin,MeshCollider/bitcoin,tjps/bitcoin,h4x3rotab/BTCGPU,litecoin-project/litecoin,jambolo/bitcoin,midnightmagic/bitcoin,MeshCollider/bitcoin,peercoin/peercoin,namecoin/namecoin-core,instagibbs/bitcoin,joshrabinowitz/bitcoin,randy-waterhouse/bitcoin,pataquets/namecoin-core,ElementsProject/elements,AkioNak/bitcoin,fanquake/bitcoin,jmcorgan/bitcoin,jamesob/bitcoin,MeshCollider/bitcoin,ericshawlinux/bitcoin,wellenreiter01/Feathercoin,vmp32k/litecoin,mm-s/bitcoin,guncoin/guncoin,vmp32k/litecoin,namecoin/namecore,Kogser/bitcoin,domob1812/bitcoin,droark/bitcoin,untrustbank/litecoin,Kogser/bitcoin,domob1812/namecore,tjps/bitcoin,lateminer/bitcoin,practicalswift/bitcoin,vmp32k/litecoin,lbryio/lbrycrd,BTCGPU/BTCGPU,Christewart/bitcoin,andreaskern/bitcoin,untrustbank/litecoin,Kogser/bitcoin,sstone/bitcoin,tecnovert/particl-core,rnicoll/dogecoin,rnicoll/bitcoin,ericshawlinux/bitcoin,joshrabinowitz/bitcoin,OmniLayer/omnicore,domob1812/namecore,AkioNak/bitcoin,cdecker/bitcoin,digibyte/digibyte,FeatherCoin/Feathercoin,afk11/bitcoin,h4x3rotab/BTCGPU,Flowdalic/bitcoin,tjps/bitcoin,vertcoin/vertcoin,yenliangl/bitcoin,bitcoinknots/bitcoin,myriadcoin/myriadcoin,guncoin/guncoin,GroestlCoin/GroestlCoin,mm-s/bitcoin,wellenreiter01/Feathercoin,particl/particl-core,myriadteam/myriadcoin,bitcoinsSG/bitcoin,bitcoin/bitcoin,RHavar/bitcoin,bitcoin/bitcoin,DigitalPandacoin/pandacoin,digibyte/digibyte,bitcoin/bitcoin,andreaskern/bitcoin,midnightmagic/bitcoin,GlobalBoost/GlobalBoost,kallewoof/bitcoin,kallewoof/bitcoin,dscotese/bitcoin,gjhiggins/vcoincore,namecoin/namecoin-core,gjhiggins/vcoincore,rnicoll/dogecoin,rnicoll/bitcoin,nikkitan/bitcoin,wellenreiter01/Feathercoin,practicalswift/bitcoin,wellenreiter01/Feathercoin,BTCGPU/BTCGPU,jlopp/statoshi,gjhiggins/vcoincore,Kogser/bitcoin,tjps/bitcoin,randy-waterhouse/bitcoin,qtumproject/qtum,mruddy/bitcoin,qtumproject/qtum,domob1812/namecore,wellenreiter01/Feathercoin,bespike/litecoin,fujicoin/fujicoin,rawodb/bitcoin,jonasschnelli/bitcoin,digibyte/digibyte,untrustbank/litecoin,thrasher-/litecoin,thrasher-/litecoin,n1bor/bitcoin,Bushstar/UFO-Project,bitcoinsSG/bitcoin,lbryio/lbrycrd,tecnovert/particl-core,droark/bitcoin,rnicoll/bitcoin,rawodb/bitcoin,tecnovert/particl-core,jambolo/bitcoin,peercoin/peercoin,achow101/bitcoin,MarcoFalke/bitcoin,alecalve/bitcoin,instagibbs/bitcoin,EthanHeilman/bitcoin,jonasschnelli/bitcoin,namecoin/namecoin-core,afk11/bitcoin,sipsorcery/bitcoin,CryptArc/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,kazcw/bitcoin,Kogser/bitcoin,qtumproject/qtum,apoelstra/bitcoin,JeremyRubin/bitcoin,FeatherCoin/Feathercoin,GroestlCoin/bitcoin,OmniLayer/omnicore,vertcoin/vertcoin,GlobalBoost/GlobalBoost,jambolo/bitcoin,myriadcoin/myriadcoin,bitcoinknots/bitcoin,pataquets/namecoin-core,randy-waterhouse/bitcoin,dscotese/bitcoin,vmp32k/litecoin,dscotese/bitcoin,Xekyo/bitcoin,alecalve/bitcoin,rnicoll/bitcoin,joshrabinowitz/bitcoin,bitcoinsSG/bitcoin,domob1812/namecore,MarcoFalke/bitcoin,anditto/bitcoin,ElementsProject/elements,rawodb/bitcoin,pstratem/bitcoin,yenliangl/bitcoin,rawodb/bitcoin,Christewart/bitcoin,jmcorgan/bitcoin,RHavar/bitcoin,alecalve/bitcoin,GlobalBoost/GlobalBoost,bitcoin/bitcoin,jtimon/bitcoin,anditto/bitcoin,peercoin/peercoin,sstone/bitcoin,Kogser/bitcoin,fujicoin/fujicoin,Sjors/bitcoin,MarcoFalke/bitcoin,domob1812/namecore,rnicoll/dogecoin,GlobalBoost/GlobalBoost,EthanHeilman/bitcoin,particl/particl-core,guncoin/guncoin,jamesob/bitcoin,instagibbs/bitcoin,GlobalBoost/GlobalBoost,kazcw/bitcoin,prusnak/bitcoin,RHavar/bitcoin,ahmedbodi/vertcoin,pstratem/bitcoin,ericshawlinux/bitcoin,myriadcoin/myriadcoin,prusnak/bitcoin,fanquake/bitcoin,jlopp/statoshi,ajtowns/bitcoin,jlopp/statoshi,prusnak/bitcoin,digibyte/digibyte,mruddy/bitcoin,Kogser/bitcoin,achow101/bitcoin,jtimon/bitcoin,BTCGPU/BTCGPU,lbryio/lbrycrd,fanquake/bitcoin,EthanHeilman/bitcoin,EthanHeilman/bitcoin,midnightmagic/bitcoin,jonasschnelli/bitcoin,myriadteam/myriadcoin,peercoin/peercoin,sipsorcery/bitcoin,fanquake/bitcoin,Kogser/bitcoin,kazcw/bitcoin,namecoin/namecore,ElementsProject/elements,pataquets/namecoin-core,jambolo/bitcoin,r8921039/bitcoin,Sjors/bitcoin,pstratem/bitcoin,RHavar/bitcoin,gjhiggins/vcoincore,n1bor/bitcoin,litecoin-project/litecoin,Christewart/bitcoin,peercoin/peercoin,jonasschnelli/bitcoin,EthanHeilman/bitcoin,monacoinproject/monacoin,myriadcoin/myriadcoin,nikkitan/bitcoin,apoelstra/bitcoin,GroestlCoin/bitcoin,ElementsProject/elements,nikkitan/bitcoin,thrasher-/litecoin,Sjors/bitcoin,cdecker/bitcoin,namecoin/namecore,jmcorgan/bitcoin,kazcw/bitcoin,Sjors/bitcoin,bitcoinknots/bitcoin,jnewbery/bitcoin,kazcw/bitcoin,rnicoll/dogecoin,mitchellcash/bitcoin,untrustbank/litecoin,jambolo/bitcoin,jambolo/bitcoin,litecoin-project/litecoin,bitcoinsSG/bitcoin,lateminer/bitcoin,randy-waterhouse/bitcoin,achow101/bitcoin,GroestlCoin/bitcoin,r8921039/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,namecoin/namecoin-core,ahmedbodi/vertcoin,FeatherCoin/Feathercoin,bespike/litecoin,domob1812/bitcoin,jlopp/statoshi,DigitalPandacoin/pandacoin,andreaskern/bitcoin,jtimon/bitcoin,nikkitan/bitcoin,GroestlCoin/GroestlCoin,bitcoinsSG/bitcoin,lbryio/lbrycrd,cdecker/bitcoin,CryptArc/bitcoin,cdecker/bitcoin,ahmedbodi/vertcoin,rawodb/bitcoin,untrustbank/litecoin,Flowdalic/bitcoin,litecoin-project/litecoin,nikkitan/bitcoin,Bushstar/UFO-Project,lbryio/lbrycrd,ajtowns/bitcoin,BTCGPU/BTCGPU,FeatherCoin/Feathercoin,OmniLayer/omnicore,r8921039/bitcoin,thrasher-/litecoin,Kogser/bitcoin,Flowdalic/bitcoin,peercoin/peercoin,kallewoof/bitcoin,h4x3rotab/BTCGPU,practicalswift/bitcoin,ajtowns/bitcoin,r8921039/bitcoin,n1bor/bitcoin,afk11/bitcoin,Bushstar/UFO-Project,ElementsProject/elements,GroestlCoin/bitcoin,kallewoof/bitcoin,alecalve/bitcoin,jmcorgan/bitcoin,myriadcoin/myriadcoin,nikkitan/bitcoin,cdecker/bitcoin,fujicoin/fujicoin,Xekyo/bitcoin,Flowdalic/bitcoin,myriadteam/myriadcoin,kallewoof/bitcoin,sstone/bitcoin,MarcoFalke/bitcoin,RHavar/bitcoin,jtimon/bitcoin,domob1812/bitcoin,ahmedbodi/vertcoin,Sjors/bitcoin,GroestlCoin/GroestlCoin,yenliangl/bitcoin,anditto/bitcoin,qtumproject/qtum,myriadteam/myriadcoin,prusnak/bitcoin,jlopp/statoshi,bitcoin/bitcoin,droark/bitcoin,apoelstra/bitcoin,AkioNak/bitcoin,anditto/bitcoin,jamesob/bitcoin,afk11/bitcoin,GroestlCoin/bitcoin,Kogser/bitcoin,EthanHeilman/bitcoin,alecalve/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecore,apoelstra/bitcoin,DigitalPandacoin/pandacoin,ajtowns/bitcoin,instagibbs/bitcoin,namecoin/namecoin-core,Christewart/bitcoin,sipsorcery/bitcoin,sipsorcery/bitcoin,domob1812/bitcoin,mm-s/bitcoin,jmcorgan/bitcoin,jnewbery/bitcoin,OmniLayer/omnicore,OmniLayer/omnicore,monacoinproject/monacoin,MarcoFalke/bitcoin,sstone/bitcoin,fujicoin/fujicoin,Bushstar/UFO-Project,Xekyo/bitcoin,litecoin-project/litecoin,GroestlCoin/GroestlCoin,thrasher-/litecoin,particl/particl-core,untrustbank/litecoin,bespike/litecoin,ajtowns/bitcoin,qtumproject/qtum,digibyte/digibyte,instagibbs/bitcoin,mitchellcash/bitcoin,jamesob/bitcoin,dscotese/bitcoin,fujicoin/fujicoin,JeremyRubin/bitcoin,jnewbery/bitcoin,myriadcoin/myriadcoin,randy-waterhouse/bitcoin,domob1812/bitcoin,r8921039/bitcoin,MeshCollider/bitcoin,ericshawlinux/bitcoin,FeatherCoin/Feathercoin,digibyte/digibyte,alecalve/bitcoin,particl/particl-core,monacoinproject/monacoin,pstratem/bitcoin,domob1812/namecore,guncoin/guncoin,mruddy/bitcoin,mitchellcash/bitcoin,sipsorcery/bitcoin,myriadteam/myriadcoin,ahmedbodi/vertcoin,lbryio/lbrycrd,n1bor/bitcoin,sipsorcery/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,practicalswift/bitcoin,kallewoof/bitcoin,particl/particl-core,ahmedbodi/vertcoin,lbryio/lbrycrd,MarcoFalke/bitcoin,Kogser/bitcoin,gjhiggins/vcoincore,JeremyRubin/bitcoin,namecoin/namecore,DigitalPandacoin/pandacoin,midnightmagic/bitcoin,achow101/bitcoin,tecnovert/particl-core,AkioNak/bitcoin,sstone/bitcoin,guncoin/guncoin,gjhiggins/vcoincore,mruddy/bitcoin,droark/bitcoin,vertcoin/vertcoin,GroestlCoin/GroestlCoin,bitcoinknots/bitcoin,joshrabinowitz/bitcoin,lateminer/bitcoin,mm-s/bitcoin,prusnak/bitcoin,andreaskern/bitcoin,yenliangl/bitcoin,RHavar/bitcoin,monacoinproject/monacoin,practicalswift/bitcoin,bitcoinsSG/bitcoin,thrasher-/litecoin,MeshCollider/bitcoin,wellenreiter01/Feathercoin,mitchellcash/bitcoin,BTCGPU/BTCGPU,afk11/bitcoin,BTCGPU/BTCGPU,dscotese/bitcoin,JeremyRubin/bitcoin,Christewart/bitcoin,practicalswift/bitcoin,Bushstar/UFO-Project,pstratem/bitcoin,Kogser/bitcoin,tjps/bitcoin,namecoin/namecore,apoelstra/bitcoin,vmp32k/litecoin,CryptArc/bitcoin,mruddy/bitcoin,n1bor/bitcoin,qtumproject/qtum,h4x3rotab/BTCGPU,randy-waterhouse/bitcoin,pstratem/bitcoin,anditto/bitcoin,jtimon/bitcoin,n1bor/bitcoin,GlobalBoost/GlobalBoost,mm-s/bitcoin,achow101/bitcoin,JeremyRubin/bitcoin,pataquets/namecoin-core,tjps/bitcoin,jamesob/bitcoin,midnightmagic/bitcoin,pataquets/namecoin-core,ElementsProject/elements,r8921039/bitcoin,OmniLayer/omnicore,CryptArc/bitcoin,fanquake/bitcoin,mruddy/bitcoin,vmp32k/litecoin,myriadteam/myriadcoin,apoelstra/bitcoin,sstone/bitcoin,bespike/litecoin,instagibbs/bitcoin,monacoinproject/monacoin