# Secured asset transfer in Fabric
## CreateAsset
create an asset that belongs to Org1
```
export ASSET_PROPERTIES=$(echo -n "{\"object_type\":\"asset_properties\",\"color\":\"blue\",\"size\":35,\"salt\":\"a94a8fe5ccb19ba61c4c0873d391e987982fbbd3\"}" | base64 | tr -d \\n)
```
```
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c '{"function":"CreateAsset","Args":["A new asset for Org1MSP"]}' --transient "{\"asset_properties\":\"$ASSET_PROPERTIES\"}"
```
## GetAssetPrivateProperties
substituting ASSET_ID with the id returned from the createAsset function
```
export ASSET_ID=d9923f21b770adbc79cbcc47a3aeecc81dc7f030bd129155301ce3932be7fbcc
```
```
peer chaincode query -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"GetAssetPrivateProperties\",\"Args\":[\"$ASSET_ID\"]}"
```
When successful, the command will return the following result
```
{"object_type":"asset_properties","color":"blue","size":35,"salt":"a94a8fe5ccb19ba61c4c0873d391e987982fbbd3"}
```
## ReadAsset
query the ledger to see the public ownership record
```
peer chaincode query -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"ReadAsset\",\"Args\":[\"$ASSET_ID\"]}"
```
The command will return the record that the asset is owned by Org1
```
{"object_type":"asset","asset_id":"d9923f21b770adbc79cbcc47a3aeecc81dc7f030bd129155301ce3932be7fbcc","owner_org":"Org1MSP","public_description":"A new asset for Org1MSP"}
```
## ChangePublicDescription
to change the asset description
```
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"ChangePublicDescription\",\"Args\":[\"$ASSET_ID\",\"This asset is for sale\"]}"
```
Query the ledger again to see the updated description
```
peer chaincode query -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"ReadAsset\",\"Args\":[\"$ASSET_ID\"]}"
```
## AgreeToSell
Agree to sell as Org1
```
export ASSET_PRICE=$(echo -n "{\"asset_id\":\"$ASSET_ID\",\"trade_id\":\"109f4b3c50d7b0df729d299bc6f8e9ef9066971f\",\"price\":110}" | base64 | tr -d \\n)
```
```
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"AgreeToSell\",\"Args\":[\"$ASSET_ID\"]}" --transient "{\"asset_price\":\"$ASSET_PRICE\"}"
```
## GetAssetSalesPrice
query the Org1 private data collection to read the agreed to selling price
```
peer chaincode query -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"GetAssetSalesPrice\",\"Args\":[\"$ASSET_ID\"]}"
```
## AgreeToBuy
Agree to buy as Org2
```
export ASSET_PRICE=$(echo -n "{\"asset_id\":\"$ASSET_ID\",\"trade_id\":\"109f4b3c50d7b0df729d299bc6f8e9ef9066971f\",\"price\":100}" | base64 | tr -d \\n)
```
```
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"AgreeToBuy\",\"Args\":[\"$ASSET_ID\"]}" --transient "{\"asset_price\":\"$ASSET_PRICE\", \"asset_properties\":\"$ASSET_PROPERTIES\"}"
```
## TransferAsset
Org1 can transfer the asset to Org2
```
peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"TransferAsset\",\"Args\":[\"$ASSET_ID\",\"Org2MSP\"]}" --transient "{\"asset_price\":\"$ASSET_PRICE\"}" --peerAddresses localhost:7051 --tlsRootCertFiles "${PWD}/organizations/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt" --peerAddresses localhost:9051 --tlsRootCertFiles "${PWD}/organizations/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt"
```
query the asset ownership record to verify that the transfer was successful
```
peer chaincode query -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com --tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" -C mychannel -n secured -c "{\"function\":\"ReadAsset\",\"Args\":[\"$ASSET_ID\"]}"
```
The record now lists Org2 as the asset owner
```
{"object_type":"asset","asset_id":"<asset1>","owner_org":"Org2MSP","public_description":"This asset is for sale"}
```
if not agreed to the same price, the transfer fails
```
Error: endorsement failure during invoke. response: status:500 message:"failed transfer verification: hash cf74b8ce092b637bd28f98f7cdd490534c102a0665e7c985d4f2ab9810e30b1c for passed price JSON {\"asset_id\":\"d9923f21b770adbc79cbcc47a3aeecc81dc7f030bd129155301ce3932be7fbcc\",\"trade_id\":\"109f4b3c50d7b0df729d299bc6f8e9ef9066971f\",\"price\":110} does not match on-chain hash 09341dbb39e81fb50ccb3a81770254525318f777fad217ae49777487116cceb4, buyer hasn't agreed to the passed trade id and price"
```
## (不用)VerifyAssetProperties
## GetAssetBidPrice
## GetAssetHashId
## QueryAssetSaleAgreements
## QueryAssetBuyAgreements
## QueryAssetHistory
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