How to implement Transaction state maintaining UTXO model?

Question

I want to implement a supply chain model where I want to consume the status based on previous transaction's status. As per I understand correct me if I am wrong using stream I can not achieve the same as in stream we are not giving any previous transaction id in API calls. Using Raw Transaction we can refer previous Transaction but for that I need to issue Asset. 

So for my case if a product's status is changed from "Available" to "Shipped"  then is it mandatory to issue Asset even if it is not required. Suppose I would have  5 intermediate state changes, then I would issue "issue 1aaH.. status 5"

Then For every state change I would deduct 1 asset like this -

sendwithdata 1aaHS.. '{"status":1}' '{"for":"stream1","key":"ProductID1","data":"486921"}'

Please let me if it is the correct way of maintaining "State change" using UTXO model structure or is there any alternative easier way for the same.

[Note: I am not able to give data as "Available" and getting this error -

CTSChain: sendwithdata 1aaHSy7jwx5W5iWxUpojxBPEBRLJwfhkvQLgiT '{"status":1}' '{"for":"stream1","key":"ProductID1","data":"Available"}'
{"method":"sendwithdata","params":["1aaHSy7jwx5W5iWxUpojxBPEBRLJwfhkvQLgiT",{"status":1},{"for":"stream1","key":"ProductID1","data":"Available"}],"id":1,"chain_name":"CTSChain"}

error code: -8
error message:
data should be hexadecimal string or recognized object]

 

 

Answer 1

If you don't need to move to production in the short term, we recommend using MultiChain 2.0 alpha to work on this. It gives you two key advantages:

1. Support for text data. If you wanted to put text data in a stream, you would use this form: "data":{"text":"Available"} rather than "data":"Available"
2. Support for data within regular UTXOs. This can help in your use case because you can have data being directly consumed because it is sitting inside a UTXO that is spent. Search for 'inline metadata' on this page: https://www.multichain.com/developers/multichain-2-0-preview-releases/

Comments

What is the difference between asset combined with stream and asset with inline meta data other than the data volume.Can you please elaborate?