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docs: reference input feature (#4074) <!-- Detail in a few bullet poi…
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| # Specification: Minting and Burning | ||
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| This document specifies those aspects of the "Transactions New > Construct" HTTP endpoint that relate to minting and burning native assets. | ||
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| ## Reference inputs for minting scripts | ||
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| [Reference inputs][ref] are inputs of a transaction that are not spent; instead, the outputs they reference are made available to, say, Plutus validator scripts for inspection. | ||
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| [ref]: https://cips.cardano.org/cips/cip31/#referenceinputs | ||
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| In particular, with reference inputs, we can define a minting script in one transaction and reference the script in subsequent transaction(s). In other words, we can save space on the blockchain by defining a script once and referencing it later, instead of including a full copy of the script with every transaction. | ||
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| The "Transactions New > Construct" HTTP endpoint allows the creation and use of reference inputs. | ||
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| Specifically: | ||
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| 1. Creation of a transaction output that contains a minting script and is suitable for use as reference input. | ||
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| In the `reference_policy_script_template` field, you can optionally add a script template. The HTTP endpoint will map this script template into a script using the wallet's policy public key, and this script will be included in the first transaction output (i.e. at index `0`) of the transaction. | ||
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| Example `POST` data for the endpoint: | ||
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| ``` | ||
| { | ||
| ... | ||
| "reference_policy_script_template": | ||
| { "all": | ||
| [ "cosigner#0", | ||
| { "active_from": 120 } | ||
| ] | ||
| }, | ||
| ... | ||
| } | ||
| ``` | ||
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| 2. Using a refence input that contains a minting script. | ||
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| In the `mint_burn` field, the array element contains `reference_input`. This field specifies a transaction input (pair of transaction ID and output index) which will be added as a reference input and is assumed to contain the minting script. (If the corresponding output was created using the method above, the appropriate output index is `0`). | ||
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| Example `POST` data for the endpoint with reference input: | ||
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| ``` | ||
| { | ||
| ... | ||
| "mint_burn": [{ | ||
| "reference_input": | ||
| { "id": "464917d2bac71df96269c2d7c34dcb83183b8a3a3253c06e9d6a8bd0681422c9", | ||
| "index": 0 | ||
| }, | ||
| "asset_name": "ab12", | ||
| "operation": | ||
| { "mint" : | ||
| { "receiving_address": #{destination}, | ||
| "quantity": 10000 | ||
| } | ||
| } | ||
| }] | ||
| ... | ||
| } | ||
| ``` | ||
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| For contrast: Example `POST` data for the endpoint with script template: | ||
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| ``` | ||
| { | ||
| ... | ||
| "mint_burn": [{ | ||
| "policy_script_template": | ||
| { "all": | ||
| [ "cosigner#0", | ||
| { "active_from": 120 } | ||
| ] | ||
| }, | ||
| "asset_name": "ab12", | ||
| "operation": | ||
| { "mint" : | ||
| { "receiving_address": #{destination}, | ||
| "quantity": 10000 | ||
| } | ||
| } | ||
| }] | ||
| ... | ||
| } | ||
| ``` |
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