Simplify resolving the dependencies of a transaction

[doitian]

Feature Request

Is your feature request related to a problem? Please describe.

Given a transaction, clients must use get_transaction and get_header to fetch each input, cell dep, and header dep.

Describe the solution you'd like

Add a high level RPC method to simplify resolving the dependencies of a transaction. The RPC method may accept a tx hash of an existing a transaction, or a full tx payload.

Describe alternatives you've considered

N/A

[doitian]

Performance concerns

CKB does not index history dead cells for performance restrictions. Internally, CKB still needs to get the whole transaction from the database to get a single dead cell from its outputs.

[doitian]

Workarounds

• Use get_transaction to resolve inputs and cell deps. It's recommended to use verbosity=0 to avoid JSON serialization overhead. Since this RPC will return the whole transaction instead of a single output, it's recommended to not include too many huge output cells in one transaction.
• Use get_header to resolve header deps.

[doitian]

Related

It's a common requirement to handle tx in CKB. For example:

• ckb-cli mock-tx sub-command and ckb-standalone-debugger stores resolved tx in ckb-mock-tx-types
• Neuron has its own resolved tx format for offline signing.
• CoBuild has included resolved inputs in the building packet payload.