How to Inspect Transaction Blocks of Channel Blockchain?

You can follow this tutorial to Inspect Transaction Blocks of Channel Blockchain.

1. Connect to the CLI container of the Hyperledger Fabric network:

$ docker exec -it cli bash
bash-4.4#

2. Download (fetch) the newest block from "mychannel" channel:

bash-4.4# peer channel fetch newest newest.block -c mychannel
[channelCmd] InitCmdFactory -> INFO 001 Endorser and orderer connections initialized
[cli.common] readBlock -> INFO 002 Received block: 5

bash-4.4# ls -l
-rw-r--r--    1 root     root          4921 Apr  1 18:00 newest.block

3. Parse the transaction block into JSON format:

bash-4.4# configtxgen -inspectBlock newest.block > newest.json
...

bash-4.4# ls -l
-rw-r--r--    1 root     root          4921 Apr 13 18:00 newest.block
-rw-r--r--    1 root     root         10335 Apr 13 18:12 newest.json

4. Copy the block file to the hosting system:

bash-4.4# exit

$ docker cp cli:/root/newest.json ./

$ more newest.json
{
 "header": {
  "data_hash": "CAQ4AibIu3ZjBx8reigN7LlLAh9f/qutxcmAyb/VH+w=",
  "number": "5",
  "previous_hash": "KDjkXFvRJAcYTp2ralLNhMAD3eZc0LxfQyHr9DZgl0M="
 },
 "metadata": {
  "metadata": [
   "CgQKAggCEvgGCq0GCpAGCgpPcmRlcmVyTVNQEoEGLS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0t...",
   "CgIIAg==",
   "AA==",
   ""
  ]
 },
 "data": {
  "data": [
   {
    "payload": {
     "data": {
      "actions": [
       {
        "header": {
         "creator": {
          "id_bytes": "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUNLekNDQWRHZ...",
          "mspid": "Org1MSP"
         },
         "nonce": "rFGfK1lB88EcQWB0hESLUSB7Zj6TWN46"
        },
        "payload": {
         "action": {
          "endorsements": [
           {
            "endorser": "CgdPcmcxTVNQEqoGLS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0...",
            "signature": "MEUCIQCCIuRNJeN0K9EDbJDBUYvp7Np6563cF7xUJAEqT40k6g..."
           },
           {
            "endorser": "CgdPcmcyTVNQEqoGLS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0...",
            "signature": "MEUCIQD43zSLDZKiTPDs62s5bJLJKn3UpTYX95EnW/0gkJg5Lg..."
           }
          ],
          "proposal_response_payload": {
           "extension": {
            "chaincode_id": {
             "name": "mycc",
             "path": "",
             "version": "2.0"
            },
            "events": null,
            "response": {
             "message": "",
             "payload": null,
             "status": 200
            },
            "results": {
             "data_model": "KV",
             "ns_rwset": [
              {
               "collection_hashed_rwset": [],
               "namespace": "_lifecycle",
               "rwset": {
                "metadata_writes": [],
                "range_queries_info": [],
                "reads": [
                 {
                  "key": "namespaces/fields/mycc/Sequence",
                  "version": null
                 }
                ]
               }
              },
              {
               "collection_hashed_rwset": [],
               "namespace": "lscc",
               "rwset": {
                "metadata_writes": [],
                "range_queries_info": [],
                "reads": [
                 {
                  "key": "mycc",
                  "version": {
                   "block_num": "4",
                   "tx_num": "0"
                  }
                 }
                ]
               }
              },
              {
               "collection_hashed_rwset": [],
               "namespace": "mycc",
               "rwset": {
                "metadata_writes": [],
                "range_queries_info": [],
                "reads": [
                 {
                  "key": "a",
                  "version": {
                   "block_num": "4",
                   "tx_num": "0"
                  }
                 },
                 {
                  "key": "b",
                  "version": {
                   "block_num": "4",
                   "tx_num": "0"
                  }
                 }
                ],
                "writes": [
                 {
                  "is_delete": false,
                  "key": "a",
                  "value": "OTA="
                 },
                 {
                  "is_delete": false,
                  "key": "b",
                  "value": "MjEw"
                 }
                ]
               }
              }
             ]
            }
           },
           "proposal_hash": "BgCskXWBzaoywJXSkAMOLyO8jLNeTKepYNBz9Db+XN4="
          }
         },
         "chaincode_proposal_payload": {
          "input": {
           "chaincode_spec": {
            "chaincode_id": {
             "name": "mycc",
             "path": "",
             "version": ""
            },
            "input": {
             "args": [
              "aW52b2tl",
              "YQ==",
              "Yg==",
              "MTA="
             ],
             "is_init": false
            },
            "timeout": 0,
            "type": "GOLANG"
           }
          }
         }
        }
       }
      ]
     },
     "header": {
      "channel_header": {
       "channel_id": "mychannel",
       "epoch": "0",
       "extension": "EgYSBG15Y2M=",
       "timestamp": "2019-04-01T14:44:32.649599656Z",
       "tls_cert_hash": null,
       "tx_id": "e6f391c8ec768f93746c5594981acffc9ce85d33d3c60856138527ccf91ce20a",
       "type": 3,
       "version": 0
      },
      "signature_header": {
       "creator": {
        "id_bytes": "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUNLekNDQWRHZ0F...",
        "mspid": "Org1MSP"
       },
       "nonce": "rFGfK1lB88EcQWB0hESLUSB7Zj6TWN46"
      }
     }
    },
    "signature": "MEQCIBzWy9jPYAaDv0cgIOSEWwH1EGwFJOjMOBJUb+W/kjmjAiAsOIn+Uw..."
   }
  ]
 }
}

 

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