view-contract-state-changes.md

description	Returns the state change details of a contract based on the key prefix (encoded to base64). Pass an empty string for this param if you would like to return all state changes.

View contract state changes

• method: EXPERIMENTAL_changes
• params:
  • changes_type: data_changes
  • account_ids: ["example.testnet"],
  • key_prefix_base64: "base64 encoded key value",
  • finality OR block_id

Example:

{% code overflow="wrap" %}

// Request
curl  https://near.blockpi.network/v1/rpc/your-rpc-key -X POST -H "Content-Type: application/json" 
--data 
'{
  "jsonrpc": "2.0",
  "id": "dontcare",
  "method": "EXPERIMENTAL_changes",
  "params": {
    "changes_type": "data_changes",
    "account_ids": ["guest-book.testnet"],
    "key_prefix_base64": "",
    "block_id": 19450732
  }
}'

// Result
{
  "jsonrpc": "2.0",
  "result": {
    "block_hash": "6U8Yd4JFZwJUNfqkD4KaKgTKmpNSmVRTSggpjmsRWdKY",
    "changes": [
      {
        "cause": {
          "type": "receipt_processing",
          "receipt_hash": "9ewznXgs2t7vRCssxW4thgaiwggnMagKybZ7ryLNTT2z"
        },
        "type": "data_update",
        "change": {
          "account_id": "guest-book.testnet",
          "key_base64": "bTo6Mzk=",
          "value_base64": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiZmhyLnRlc3RuZXQiLCJ0ZXh0IjoiSGkifQ=="
        }
      },
      {
        "cause": {
          "type": "receipt_processing",
          "receipt_hash": "9ewznXgs2t7vRCssxW4thgaiwggnMagKybZ7ryLNTT2z"
        },
        "type": "data_update",
        "change": {
          "account_id": "guest-book.testnet",
          "key_base64": "bTpsZW4=",
          "value_base64": "NDA="
        }
      }
    ]
  },
  "id": "dontcare"
}

{% endcode %}