hush3/src/cc/CCassetsCore.cpp

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 * Copyright © 2014-2019 The SuperNET Developers.                             *
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 * holder information and the developer policies on copyright and licensing.  *
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#include "CCassets.h"

/*
 The SetAssetFillamounts() and ValidateAssetRemainder() work in tandem to calculate the vouts for a fill and to validate the vouts, respectively.
 
 This pair of functions are critical to make sure the trading is correct and is the trickiest part of the assets contract.
 
 //vin.0: normal input
 //vin.1: unspendable.(vout.0 from buyoffer) buyTx.vout[0]
 //vin.2+: valid CC output satisfies buyoffer (*tx.vin[2])->nValue
 //vout.0: remaining amount of bid to unspendable
 //vout.1: vin.1 value to signer of vin.2
 //vout.2: vin.2 assetoshis to original pubkey
 //vout.3: CC output for assetoshis change (if any)
 //vout.4: normal output for change (if any)
 //vout.n-1: opreturn [EVAL_ASSETS] ['B'] [assetid] [remaining asset required] [origpubkey]
    ValidateAssetRemainder(remaining_price,tx.vout[0].nValue,nValue,tx.vout[1].nValue,tx.vout[2].nValue,totalunits);
 
 Yes, this is quite confusing...
 
 In ValudateAssetRemainder the naming convention is nValue is the coin/asset with the offer on the books and "units" is what it is being paid in. The high level check is to make sure we didnt lose any coins or assets, the harder to validate is the actual price paid as the "orderbook" is in terms of the combined nValue for the combined totalunits.
 
 We assume that the effective unit cost in the orderbook is valid and that that amount was paid and also that any remainder will be close enough in effective unit cost to not matter. At the edge cases, this will probably be not true and maybe some orders wont be practically fillable when reduced to fractional state. However, the original pubkey that created the offer can always reclaim it.
*/

bool ValidateBidRemainder(int64_t remaining_units,int64_t remaining_nValue,int64_t orig_nValue,int64_t received_nValue,int64_t paidunits,int64_t totalunits)
{
    int64_t unitprice,recvunitprice,newunitprice=0;
    if ( orig_nValue == 0 || received_nValue == 0 || paidunits == 0 || totalunits == 0 )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_nValue == %llu || received_nValue == %llu || paidunits == %llu || totalunits == %llu\n",(long long)orig_nValue,(long long)received_nValue,(long long)paidunits,(long long)totalunits);
        return(false);
    }
    else if ( totalunits != (remaining_units + paidunits) )
    {
        fprintf(stderr,"ValidateAssetRemainder: totalunits %llu != %llu (remaining_units %llu + %llu paidunits)\n",(long long)totalunits,(long long)(remaining_units + paidunits),(long long)remaining_units,(long long)paidunits);
        return(false);
    }
    else if ( orig_nValue != (remaining_nValue + received_nValue) )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_nValue %llu != %llu (remaining_nValue %llu + %llu received_nValue)\n",(long long)orig_nValue,(long long)(remaining_nValue - received_nValue),(long long)remaining_nValue,(long long)received_nValue);
        return(false);
    }
    else
    {
        //unitprice = (orig_nValue * COIN) / totalunits;
        //recvunitprice = (received_nValue * COIN) / paidunits;
        //if ( remaining_units != 0 )
        //    newunitprice = (remaining_nValue * COIN) / remaining_units;
        unitprice = (orig_nValue / totalunits);
        recvunitprice = (received_nValue / paidunits);
        if ( remaining_units != 0 )
            newunitprice = (remaining_nValue / remaining_units);
        if ( recvunitprice < unitprice )
        {
            fprintf(stderr,"error recvunitprice %.8f < %.8f unitprice, new unitprice %.8f\n",(double)recvunitprice/(COIN),(double)unitprice/(COIN),(double)newunitprice/(COIN));
            return(false);
        }
        fprintf(stderr,"orig %llu total %llu, recv %llu paid %llu,recvunitprice %.8f >= %.8f unitprice, new unitprice %.8f\n",(long long)orig_nValue,(long long)totalunits,(long long)received_nValue,(long long)paidunits,(double)recvunitprice/(COIN),(double)unitprice/(COIN),(double)newunitprice/(COIN));
    }
    return(true);
}

bool SetBidFillamounts(int64_t &received_nValue,int64_t &remaining_units,int64_t orig_nValue,int64_t &paidunits,int64_t totalunits)
{
    int64_t remaining_nValue,unitprice; double dprice;
    if ( totalunits == 0 )
    {
        received_nValue = remaining_units = paidunits = 0;
        return(false);
    }
    if ( paidunits >= totalunits )
    {
        paidunits = totalunits;
        received_nValue = orig_nValue;
        remaining_units = 0;
        fprintf(stderr,"totally filled!\n");
        return(true);
    }
    remaining_units = (totalunits - paidunits);
    //unitprice = (orig_nValue * COIN) / totalunits;
    //received_nValue = (paidunits * unitprice) / COIN;
    unitprice = (orig_nValue / totalunits);
    received_nValue = (paidunits * unitprice);
    if ( unitprice > 0 && received_nValue > 0 && received_nValue <= orig_nValue )
    {
        remaining_nValue = (orig_nValue - received_nValue);
        printf("total.%llu - paid.%llu, remaining %llu <- %llu (%llu - %llu)\n",(long long)totalunits,(long long)paidunits,(long long)remaining_nValue,(long long)(orig_nValue - received_nValue),(long long)orig_nValue,(long long)received_nValue);
        return(ValidateBidRemainder(remaining_units,remaining_nValue,orig_nValue,received_nValue,paidunits,totalunits));
    } else return(false);
}

bool SetAskFillamounts(int64_t &received_assetoshis,int64_t &remaining_nValue,int64_t orig_assetoshis,int64_t &paid_nValue,int64_t total_nValue)
{
    int64_t remaining_assetoshis; double dunitprice;
    if ( total_nValue == 0 )
    {
        received_assetoshis = remaining_nValue = paid_nValue = 0;
        return(false);
    }
    if ( paid_nValue >= total_nValue )
    {
        paid_nValue = total_nValue;
        received_assetoshis = orig_assetoshis;
        remaining_nValue = 0;
        fprintf(stderr,"totally filled!\n");
        return(true);
    }
    remaining_nValue = (total_nValue - paid_nValue);
    dunitprice = ((double)total_nValue / orig_assetoshis);
    received_assetoshis = (paid_nValue / dunitprice);
    fprintf(stderr,"remaining_nValue %.8f (%.8f - %.8f)\n",(double)remaining_nValue/COIN,(double)total_nValue/COIN,(double)paid_nValue/COIN);
    fprintf(stderr,"unitprice %.8f received_assetoshis %llu orig %llu\n",dunitprice/COIN,(long long)received_assetoshis,(long long)orig_assetoshis);
    if ( fabs(dunitprice) > SMALLVAL && received_assetoshis > 0 && received_assetoshis <= orig_assetoshis )
    {
        remaining_assetoshis = (orig_assetoshis - received_assetoshis);
        return(ValidateAskRemainder(remaining_nValue,remaining_assetoshis,orig_assetoshis,received_assetoshis,paid_nValue,total_nValue));
    } else return(false);
}

bool ValidateAskRemainder(int64_t remaining_nValue,int64_t remaining_assetoshis,int64_t orig_assetoshis,int64_t received_assetoshis,int64_t paid_nValue,int64_t total_nValue)
{
    int64_t unitprice,recvunitprice,newunitprice=0;
    if ( orig_assetoshis == 0 || received_assetoshis == 0 || paid_nValue == 0 || total_nValue == 0 )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_assetoshis == %llu || received_assetoshis == %llu || paid_nValue == %llu || total_nValue == %llu\n",(long long)orig_assetoshis,(long long)received_assetoshis,(long long)paid_nValue,(long long)total_nValue);
        return(false);
    }
    else if ( total_nValue != (remaining_nValue + paid_nValue) )
    {
        fprintf(stderr,"ValidateAssetRemainder: total_nValue %llu != %llu (remaining_nValue %llu + %llu paid_nValue)\n",(long long)total_nValue,(long long)(remaining_nValue + paid_nValue),(long long)remaining_nValue,(long long)paid_nValue);
        return(false);
    }
    else if ( orig_assetoshis != (remaining_assetoshis + received_assetoshis) )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_assetoshis %llu != %llu (remaining_nValue %llu + %llu received_nValue)\n",(long long)orig_assetoshis,(long long)(remaining_assetoshis - received_assetoshis),(long long)remaining_assetoshis,(long long)received_assetoshis);
        return(false);
    }
    else
    {
        unitprice = (total_nValue / orig_assetoshis);
        recvunitprice = (paid_nValue / received_assetoshis);
        if ( remaining_nValue != 0 )
            newunitprice = (remaining_nValue / remaining_assetoshis);
        if ( recvunitprice < unitprice )
        {
            fprintf(stderr,"error recvunitprice %.8f < %.8f unitprice, new unitprice %.8f\n",(double)recvunitprice/COIN,(double)unitprice/COIN,(double)newunitprice/COIN);
            return(false);
        }
        fprintf(stderr,"got recvunitprice %.8f >= %.8f unitprice, new unitprice %.8f\n",(double)recvunitprice/COIN,(double)unitprice/COIN,(double)newunitprice/COIN);
    }
    return(true);
}

bool SetSwapFillamounts(int64_t &received_assetoshis,int64_t &remaining_assetoshis2,int64_t orig_assetoshis,int64_t &paid_assetoshis2,int64_t total_assetoshis2)
{
    int64_t remaining_assetoshis; double dunitprice;
    if ( total_assetoshis2 == 0 )
    {
        fprintf(stderr,"total_assetoshis2.0 origsatoshis.%llu paid_assetoshis2.%llu\n",(long long)orig_assetoshis,(long long)paid_assetoshis2);
        received_assetoshis = remaining_assetoshis2 = paid_assetoshis2 = 0;
        return(false);
    }
    if ( paid_assetoshis2 >= total_assetoshis2 )
    {
        paid_assetoshis2 = total_assetoshis2;
        received_assetoshis = orig_assetoshis;
        remaining_assetoshis2 = 0;
        fprintf(stderr,"totally filled!\n");
        return(true);
    }
    remaining_assetoshis2 = (total_assetoshis2 - paid_assetoshis2);
    dunitprice = ((double)total_assetoshis2 / orig_assetoshis);
    received_assetoshis = (paid_assetoshis2 / dunitprice);
    fprintf(stderr,"remaining_assetoshis2 %llu (%llu - %llu)\n",(long long)remaining_assetoshis2/COIN,(long long)total_assetoshis2/COIN,(long long)paid_assetoshis2/COIN);
    fprintf(stderr,"unitprice %.8f received_assetoshis %llu orig %llu\n",dunitprice/COIN,(long long)received_assetoshis,(long long)orig_assetoshis);
    if ( fabs(dunitprice) > SMALLVAL && received_assetoshis > 0 && received_assetoshis <= orig_assetoshis )
    {
        remaining_assetoshis = (orig_assetoshis - received_assetoshis);
        return(ValidateAskRemainder(remaining_assetoshis2,remaining_assetoshis,orig_assetoshis,received_assetoshis,paid_assetoshis2,total_assetoshis2));
    } else return(false);
}

bool ValidateSwapRemainder(int64_t remaining_price,int64_t remaining_nValue,int64_t orig_nValue,int64_t received_nValue,int64_t paidunits,int64_t totalunits)
{
    int64_t unitprice,recvunitprice,newunitprice=0;
    if ( orig_nValue == 0 || received_nValue == 0 || paidunits == 0 || totalunits == 0 )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_nValue == %llu || received_nValue == %llu || paidunits == %llu || totalunits == %llu\n",(long long)orig_nValue,(long long)received_nValue,(long long)paidunits,(long long)totalunits);
        return(false);
    }
    else if ( totalunits != (remaining_price + paidunits) )
    {
        fprintf(stderr,"ValidateAssetRemainder: totalunits %llu != %llu (remaining_price %llu + %llu paidunits)\n",(long long)totalunits,(long long)(remaining_price + paidunits),(long long)remaining_price,(long long)paidunits);
        return(false);
    }
    else if ( orig_nValue != (remaining_nValue + received_nValue) )
    {
        fprintf(stderr,"ValidateAssetRemainder: orig_nValue %llu != %llu (remaining_nValue %llu + %llu received_nValue)\n",(long long)orig_nValue,(long long)(remaining_nValue - received_nValue),(long long)remaining_nValue,(long long)received_nValue);
        return(false);
    }
    else
    {
        unitprice = (orig_nValue * COIN) / totalunits;
        recvunitprice = (received_nValue * COIN) / paidunits;
        if ( remaining_price != 0 )
            newunitprice = (remaining_nValue * COIN) / remaining_price;
        if ( recvunitprice < unitprice )
        {
            fprintf(stderr,"error recvunitprice %.8f < %.8f unitprice, new unitprice %.8f\n",(double)recvunitprice/(COIN*COIN),(double)unitprice/(COIN*COIN),(double)newunitprice/(COIN*COIN));
            return(false);
        }
        fprintf(stderr,"recvunitprice %.8f >= %.8f unitprice, new unitprice %.8f\n",(double)recvunitprice/(COIN*COIN),(double)unitprice/(COIN*COIN),(double)newunitprice/(COIN*COIN));
    }
    return(true);
}

CScript EncodeAssetCreateOpRet(uint8_t funcid,std::vector<uint8_t> origpubkey,std::string name,std::string description)
{
    CScript opret; uint8_t evalcode = EVAL_ASSETS;
    opret << OP_RETURN << E_MARSHAL(ss << evalcode << funcid << origpubkey << name << description);
    return(opret);
}

CScript EncodeAssetOpRet(uint8_t funcid,uint256 assetid,uint256 assetid2,int64_t price,std::vector<uint8_t> origpubkey)
{
    CScript opret; uint8_t evalcode = EVAL_ASSETS;
    assetid = revuint256(assetid);
    switch ( funcid )
    {
        case 't':  case 'x': case 'o':
            opret << OP_RETURN << E_MARSHAL(ss << evalcode << funcid << assetid);
            break;
        case 's': case 'b': case 'S': case 'B':
            opret << OP_RETURN << E_MARSHAL(ss << evalcode << funcid << assetid << price << origpubkey);
            break;
        case 'E': case 'e':
            assetid2 = revuint256(assetid2);
            opret << OP_RETURN << E_MARSHAL(ss << evalcode << funcid << assetid << assetid2 << price << origpubkey);
            break;
        default:
            fprintf(stderr,"EncodeOpRet: illegal funcid.%02x\n",funcid);
            opret << OP_RETURN;
            break;
    }
    return(opret);
}

bool DecodeAssetCreateOpRet(const CScript &scriptPubKey,std::vector<uint8_t> &origpubkey,std::string &name,std::string &description)
{
    std::vector<uint8_t> vopret; uint8_t evalcode,funcid,*script;
    GetOpReturnData(scriptPubKey, vopret);
    script = (uint8_t *)vopret.data();
    if ( script != 0 && vopret.size() > 2 && script[0] == EVAL_ASSETS && script[1] == 'c' )
    {
        if ( E_UNMARSHAL(vopret,ss >> evalcode; ss >> funcid; ss >> origpubkey; ss >> name; ss >> description) != 0 )
            return(true);
    }
    return(0);
}

uint8_t DecodeAssetOpRet(const CScript &scriptPubKey,uint256 &assetid,uint256 &assetid2,int64_t &price,std::vector<uint8_t> &origpubkey)
{
    std::vector<uint8_t> vopret; uint8_t funcid=0,*script,e,f;
    GetOpReturnData(scriptPubKey, vopret);
    script = (uint8_t *)vopret.data();
    memset(&assetid,0,sizeof(assetid));
    memset(&assetid2,0,sizeof(assetid2));
    price = 0;
    if ( script != 0 && script[0] == EVAL_ASSETS )
    {
        funcid = script[1];
        //fprintf(stderr,"decode.[%c]\n",funcid);
        switch ( funcid )
        {
            case 'c': return(funcid);
                break;
            case 't':  case 'x': case 'o':
                if ( E_UNMARSHAL(vopret,ss >> e; ss >> f; ss >> assetid) != 0 )
                {
                    assetid = revuint256(assetid);
                    return(funcid);
                }
                break;
            case 's': case 'b': case 'S': case 'B':
                if ( E_UNMARSHAL(vopret,ss >> e; ss >> f; ss >> assetid; ss >> price; ss >> origpubkey) != 0 )
                {
                    assetid = revuint256(assetid);
                    //fprintf(stderr,"got price %llu\n",(long long)price);
                    return(funcid);
                }
                break;
            case 'E': case 'e':
                if ( E_UNMARSHAL(vopret,ss >> e; ss >> f; ss >> assetid; ss >> assetid2; ss >> price; ss >> origpubkey) != 0 )
                {
                    //fprintf(stderr,"got price %llu\n",(long long)price);
                    assetid = revuint256(assetid);
                    assetid2 = revuint256(assetid2);
                    return(funcid);
                }
                break;
            default:
                fprintf(stderr,"DecodeAssetOpRet: illegal funcid.%02x\n",funcid);
                funcid = 0;
                break;
        }
    }
    return(funcid);
}

bool SetAssetOrigpubkey(std::vector<uint8_t> &origpubkey,int64_t &price,const CTransaction &tx)
{
    uint256 assetid,assetid2;
    if ( tx.vout.size() > 0 && DecodeAssetOpRet(tx.vout[tx.vout.size()-1].scriptPubKey,assetid,assetid2,price,origpubkey) != 0 )
        return(true);
    else return(false);
}
           
bool GetAssetorigaddrs(struct CCcontract_info *cp,char *CCaddr,char *destaddr,const CTransaction& tx)
{
    uint256 assetid,assetid2; int64_t price,nValue=0; int32_t n; uint8_t funcid; std::vector<uint8_t> origpubkey; CScript script;
    n = tx.vout.size();
    if ( n == 0 || (funcid= DecodeAssetOpRet(tx.vout[n-1].scriptPubKey,assetid,assetid2,price,origpubkey)) == 0 )
        return(false);
    if ( GetCCaddress(cp,CCaddr,pubkey2pk(origpubkey)) != 0 && Getscriptaddress(destaddr,CScript() << origpubkey << OP_CHECKSIG) != 0 )
        return(true);
    else return(false);
}


// Checks if the vout is a really Asset CC vout
// if maxAssetExactAmountDepth > 0, it also validates the vin transaction itself: 
// it should be either sum(cc vins) == sum(cc vouts) or the transaction is the 'tokenbase' ('c') tx
int64_t IsAssetvout(int32_t maxAssetExactAmountDepth, struct CCcontract_info *cp, Eval* eval, int64_t &price,std::vector<uint8_t> &origpubkey,const CTransaction& tx,int32_t v,uint256 refassetid)
{
    uint256 assetid,assetid2; int64_t nValue=0; int32_t n; uint8_t funcid;

    if ( tx.vout[v].scriptPubKey.IsPayToCryptoCondition() != 0 ) // maybe check address too?
    {

		if (maxAssetExactAmountDepth > 0) {
			//validate all tx
			int64_t myCCVinsAmount = 0, myCCVoutsAmount = 0;
			std::vector<CTransaction> ccVinsTxs;
			
			//std::cerr << "IsAssetvout() validate=yes" << std::endl;
			const bool validateVinTxs = false;
			bool isEqualAmounts = AssetExactAmounts(maxAssetExactAmountDepth, cp, myCCVinsAmount, 0, myCCVoutsAmount, eval, tx, refassetid);
			
			// if ccInputs != ccOutputs and it is not the tokenbase tx means it is possibly fake tx (dimxy):
			if (!isEqualAmounts && refassetid != tx.GetHash()) {	// checking that this is the true tokenbase tx, by verifying that funcid=c, is done further in this function (dimxy)
				std::cerr << "IsAssetvout() detected bad tx=" << tx.GetHash().GetHex() << ": cc inputs != cc outputs and not the 'tokenbase' tx" << std::endl;
				return 0;
			}
		}


		n = tx.vout.size();
		if (v >= n - 1) {  // just moved this up (dimxy)
			std::cerr << "isAssetVout() internal err: (v >= n - 1), returning 0" << std::endl;
			return(0);
		}
        nValue = tx.vout[v].nValue;

        // fprintf(stderr,"IsAssetvout() CC vout v.%d of n=%d amount=%.8f\n",v,n,(double)nValue/COIN);

        if ( (funcid= DecodeAssetOpRet(tx.vout[n-1].scriptPubKey,assetid,assetid2,price,origpubkey)) == 0 )
        {
            fprintf(stderr,"IsAssetvout() null decodeopret v.%d\n",v);
            return(0);
        }
        else if ( funcid == 'c' )
        {
			if (refassetid == tx.GetHash() && v == 0) {
				std::cerr << "isAssetVout() this is the tokenbase 'c' tx, txid=" << tx.GetHash().GetHex() << " returning nValue=" << nValue << std::endl;
				return(nValue);
			}
        }
        else if ( (funcid == 'b' || funcid == 'B') && v == 0 ) // critical! 'b'/'B' vout0 is NOT asset
            return(0);
        else if ( funcid != 'E' )
        {
            if ( assetid == refassetid )
            {
                fprintf(stderr,"IsAssetvout() returning %.8f\n",(double)nValue/COIN);
                return(nValue);
            }
        }
        else if ( funcid == 'E' )
        {
            if ( v < 2 && assetid == refassetid )
                return(nValue);
            else if ( v == 2 && assetid2 == refassetid )
                return(nValue);
        }
    }
    //fprintf(stderr,"Isassetvout: normal output v.%d %.8f\n",v,(double)tx.vout[v].nValue/COIN);
    return(0);
}

int64_t AssetValidateCCvin(struct CCcontract_info *cp,Eval* eval,char *CCaddr,char *origaddr,const CTransaction &tx,int32_t vini,CTransaction &vinTx)
{
    uint256 hashBlock; char destaddr[64];
    origaddr[0] = destaddr[0] = CCaddr[0] = 0;
    if ( tx.vin.size() < 2 )
        return eval->Invalid("not enough for CC vins");
    else if ( tx.vin[vini].prevout.n != 0 )
        return eval->Invalid("vin1 needs to be buyvin.vout[0]");
    else if ( eval->GetTxUnconfirmed(tx.vin[vini].prevout.hash,vinTx,hashBlock) == 0 )
    {
        int32_t z;
        for (z=31; z>=0; z--)
            fprintf(stderr,"%02x",((uint8_t *)&tx.vin[vini].prevout.hash)[z]);
        fprintf(stderr," vini.%d\n",vini);
        return eval->Invalid("always should find CCvin, but didnt");
    }
    else if ( Getscriptaddress(destaddr,vinTx.vout[tx.vin[vini].prevout.n].scriptPubKey) == 0 || strcmp(destaddr,(char *)cp->unspendableCCaddr) != 0 )
    {
        fprintf(stderr,"%s vs %s\n",destaddr,(char *)cp->unspendableCCaddr);
        return eval->Invalid("invalid vin AssetsCCaddr");
    }
    //else if ( vinTx.vout[0].nValue < 10000 )
    //    return eval->Invalid("invalid dust for buyvin");
    else if ( GetAssetorigaddrs(cp,CCaddr,origaddr,vinTx) == 0 )
        return eval->Invalid("couldnt get origaddr for buyvin");
    fprintf(stderr,"Got %.8f to origaddr.(%s)\n",(double)vinTx.vout[tx.vin[vini].prevout.n].nValue/COIN,origaddr);
    if ( vinTx.vout[0].nValue == 0 )
        return eval->Invalid("null value CCvin");
    return(vinTx.vout[0].nValue);
}

int64_t AssetValidateBuyvin(struct CCcontract_info *cp,Eval* eval,int64_t &tmpprice,std::vector<uint8_t> &tmporigpubkey,char *CCaddr,char *origaddr,const CTransaction &tx,uint256 refassetid)
{
    CTransaction vinTx; int64_t nValue; uint256 assetid,assetid2; uint8_t funcid;
    CCaddr[0] = origaddr[0] = 0;
    if ( (nValue= AssetValidateCCvin(cp,eval,CCaddr,origaddr,tx,1,vinTx)) == 0 )
        return(0);
    else if ( vinTx.vout[0].scriptPubKey.IsPayToCryptoCondition() == 0 )
        return eval->Invalid("invalid normal vout0 for buyvin");
    else
    {
        //fprintf(stderr,"have %.8f checking assetid origaddr.(%s)\n",(double)nValue/COIN,origaddr);
        if ( vinTx.vout.size() > 0 && (funcid= DecodeAssetOpRet(vinTx.vout[vinTx.vout.size()-1].scriptPubKey,assetid,assetid2,tmpprice,tmporigpubkey)) != 'b' && funcid != 'B' )
            return eval->Invalid("invalid opreturn for buyvin");
        else if ( refassetid != assetid )
            return eval->Invalid("invalid assetid for buyvin");
        //int32_t i; for (i=31; i>=0; i--)
        //    fprintf(stderr,"%02x",((uint8_t *)&assetid)[i]);
        //fprintf(stderr," AssetValidateBuyvin assetid for %s\n",origaddr);
    }
    return(nValue);
}

int64_t AssetValidateSellvin(struct CCcontract_info *cp,Eval* eval,int64_t &tmpprice,std::vector<uint8_t> &tmporigpubkey,char *CCaddr,char *origaddr,const CTransaction &tx,uint256 assetid)
{
    CTransaction vinTx; int64_t nValue,assetoshis;
    fprintf(stderr,"AssetValidateSellvin\n");
    if ( (nValue= AssetValidateCCvin(cp,eval,CCaddr,origaddr,tx,1,vinTx)) == 0 )
        return(0);
    if ( (assetoshis= IsAssetvout(1, cp, NULL, tmpprice,tmporigpubkey,vinTx,0,assetid)) == 0 )
        return eval->Invalid("invalid missing CC vout0 for sellvin");
    else return(assetoshis);
}


// overload with additional params for deep tx validation (dimxy)
bool AssetExactAmounts(int maxDepth, struct CCcontract_info *cp, int64_t &inputs, int32_t starti, int64_t &outputs, Eval* eval, const CTransaction &tx, uint256 assetid)
{
    CTransaction vinTx; uint256 hashBlock,id,id2; int32_t i,flag,numvins,numvouts; int64_t assetoshis; std::vector<uint8_t> tmporigpubkey; int64_t tmpprice;
    numvins = tx.vin.size();
    numvouts = tx.vout.size();
    inputs = outputs = 0;

	maxDepth--;

    for (i=starti; i<numvins; i++)
    {
        if ( (*cp->ismyvin)(tx.vin[i].scriptSig) != 0 )
        {		
			//std::cerr << "AssetExactAmounts() eval is true=" << (eval != NULL) << " ismyvin=ok for_i=" << i << std::endl;
																				                // we are really not inside validation! -- dimxy
            if ( (eval && eval->GetTxUnconfirmed(tx.vin[i].prevout.hash,vinTx,hashBlock) == 0) || (!eval && !myGetTransaction(tx.vin[i].prevout.hash, vinTx, hashBlock)) )
            {
                fprintf(stderr,"AssetExactAmounts() cannot read vintx i.%d starti.%d numvins.%d\n", i,starti,numvins);
                return (!eval) ? false : eval->Invalid("always should find vin, but didnt");

            }								// false means 'don't go deeper' -- dimxy  
            else if ( (assetoshis= IsAssetvout( maxDepth, cp, eval, tmpprice,tmporigpubkey,vinTx,tx.vin[i].prevout.n,assetid)) != 0 )
            {
                fprintf(stderr,"AssetExactAmounts() vin%d %llu, ",i,(long long)assetoshis);
                inputs += assetoshis;
            }
            else
            {
                if ( vinTx.vout[i].scriptPubKey.IsPayToCryptoCondition() != 0 && DecodeAssetOpRet(vinTx.vout[vinTx.vout.size()-1].scriptPubKey,id,id2,tmpprice,tmporigpubkey) == 't' && id == assetid )
                {
                    assetoshis = vinTx.vout[i].nValue;
                    fprintf(stderr,"AssetExactAmounts() vin%d assetoshis=%llu special case, ",i,(long long)assetoshis);
                    inputs += assetoshis;
                }
            }
        }
    }


    if ( DecodeAssetOpRet(tx.vout[tx.vout.size()-1].scriptPubKey,id,id2,tmpprice,tmporigpubkey) == 't' && id == assetid )
        flag = 1;
    else flag = 0;

    for (i=0; i<numvouts; i++)
    {					     	  // 'false' means 'dont go deep' -- dimxy
        if ( (assetoshis= IsAssetvout(maxDepth, cp, eval, tmpprice,tmporigpubkey,tx,i,assetid)) != 0 )
        {
            fprintf(stderr,"AssetExactAmounts() vout%d assetoshis=%llu, ",i,(long long)assetoshis);
            outputs += assetoshis;
        }
		// Note: account it only if this is 'transfer' tx  -- dimxy
        else if ( flag != 0 && tx.vout[i].scriptPubKey.IsPayToCryptoCondition() != 0 )
        {
            assetoshis = tx.vout[i].nValue;
            fprintf(stderr,"AssetExactAmounts() vout%d assetoshis=%llu special case, ",i,(long long)assetoshis);
            outputs += assetoshis;
        }
    }

	//std::cerr << "AssetExactAmounts() inputs=" << inputs << " outputs=" << outputs << " for txid=" << tx.GetHash().GetHex() << std::endl;

    if ( inputs != outputs )
    {
        std::cerr << "AssetExactAmounts() incorrect inputs=" << (double)inputs / COIN << " vs outputs=" << (double)outputs/COIN << " for txid=" << tx.GetHash().GetHex() << std::endl;
        return(false);
    }
    else return(true);
}

// overload for existing calls of this function (dimxy)
/*bool AssetExactAmounts(struct CCcontract_info *cp, int64_t &inputs, int32_t starti, int64_t &outputs, Eval* eval, const CTransaction &tx, uint256 assetid) {
	std::vector<CTransaction> ccVinsTxs;

	return AssetExactAmounts(true, cp, inputs, starti, outputs, eval, tx, assetid);
}*/