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Block service endpoints

Block service API endpoints return whole blocks—headers and payloads—from the chain database. Generally, blocks are returned in ascending order and include orphaned blocks.

If you only want to query blocks that are included in the winning branch of the chain, you can call the branch endpoints. Branch endpoints return blocks in descending order starting from the leafs of branches of the block chain.

Blocks are returned in only one format, with block headers and payloads in JSON encoding.

Get whole blocks

Use GET The blocks are returned in ascending order. All blocks that match the criteria are returned from the chain database, including orphaned blocks.

Path parameters

ParameterTypeDescription
chain (required)integer >= 0Specifies the chain identifier of the chain you want to send the request to. Valid values are 0 to 19. For example, to get block hashes for the first chain (0), the request is GET http://{baseURL}/chain/0/block.

Query parameters

ParameterTypeDescription
limitinteger >= 0Specifies the maximum number of records that should be returned. The actual number of records returned might be lower than the value you specify. For example: limit=3.
nextstringSpecifies the cursor value to retrieve the next page of results. You can find the value to specify in the next property returned by the previous page in a successful response. For example: "inclusive:qgsxD1G5m8dGZ4W9nMKBotU2I10ilURkRIE3_UKHlLM".
minheightinteger >= 0Specifies the minimum block height for the blocks to return. For example: minheight=4471908.
maxheightinteger >= 0Specifies the maximum block height for the blocks to return. For example: maxheight=4953816.

Responses

Requests to GET http://{baseURL}/chain/{chain}/block can return the following response codes:

  • 200 OK indicates that the request succeeded. The response body includes all of the blocks matching the criteria specified, including any orphaned blocks.
  • 404 Not Found indicates that no blocks matching the request criteria were found or that the next or maxheight parameter wasn't valid.

Response header

The response header parameters are the same for all successful and unsuccessful Chainweb node requests.

ParameterTypeDescription
x-peer-addrstringSpecifies the host address and port number of the client as observed by the remote Chainweb node. The host address can be a domain name or an IP address in IPv4 or IPv6 format. For example: "10.36.1.3:42988".
x-server‑timestampinteger >= 0Specifies the clock time of the remote Chainweb node using the UNIX epoch timestamp. For example: 1618597601.
x‑chainweb‑node‑versionstringSpecifies the version of the remote Chainweb node. For example: "2.23".

Successful response schema

If the request is successful, the response returns application/json content with the following:

ParameterTypeDescription
items (required)Array of objectsReturns an array of JSON-encoded objects representing full blocks.
limit (required)integer >= 0Specifies the maximum number of items in the page. This number can be smaller but never larger than the number of requested items.
next (required)string or nullReturns a value that can be used to query the next page. You can use this value for the next parameter in a follow-up request. The format for this parameter consists of two parts. The first part of the string can be inclusive, exclusive or null. The second part is the value that calls the next page of results or null if there are no more results to query.

Examples

You can send a request to the Kadena main network—mainnet01—and chain 19 by calling the main network service endpoint like this:

Postman
GET http://api.chainweb.com/chainweb/0.0/mainnet01/chain/19/block?limit=1
Postman
GET http://api.chainweb.com/chainweb/0.0/mainnet01/chain/19/block?limit=1

This request returns one whole block in the response body:

json
{    "limit": 1,    "items": [        {            "header": {                "nonce": "0",                "creationTime": 1572393660000000,                "parent": "az5Y9U7gziz1nghnTMCR9pqZHApM5bqoqoU-PhWdrCU",                "adjacents": {                    "18": "uNzV6l3JEfRSbG8xI-W7dexgUR3RRbdpDzdfrJKyaZ8",                    "4": "Ou6kxMXpuwpm9uiIVhiEFHSbTdhanjHyiEh2G0EZV_w",                    "10": "QGPuG9FMAW15eqGOWSGcDna32l8oBnYFmvVBwHFNrg4"                },                "target": "MKiv2H1xBe7jlMF0WdiNF7m1HaJb6Uvec8sAAAAAAAA",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "chainId": 19,                "weight": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",                "height": 852054,                "chainwebVersion": "mainnet01",                "epochStart": 1572393660000000,                "featureFlags": 0,                "hash": "y76dr78dPJlFDMPzCc-aEz97iRyimv5Ij3psdVlC64c"            },            "payloadWithOutputs": {                "transactions": [                    [                        "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6IkxvYWRlZCBpbnRlcmZhY2UgZnVuZ2libGUtdjEifSwicmVxS2V5IjoiNDhUMExqQW5TRnBGV3h2dmFQVi1fNkUtQ2pEQVBoV1lVRldidnlmMmxGcyIsImxvZ3MiOiJRRmEyOHRuOXkydFdMVzdUc3lHdzNOTkhpYzhxYjJ6UGtudXRpWWhnQXc4IiwibWV0YURhdGEiOm51bGwsImNvbnRpbnVhdGlvbiI6bnVsbCwidHhJZCI6MH0"                    ],                    [                        "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",                        "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6IldyaXRlIHN1Y2NlZWRlZCJ9LCJyZXFLZXkiOiJCdVYtZkZKNG0xMC1YdjEyNkpwOUJoa0F6ekJLdEFkU2NNTk9GMFBkNnFjIiwibG9ncyI6IkxmMXlYSzdBVmd0VkJBOTlneWg2YWZYaU02dWVyZm9pcG8tYWZHZ3hmeUkiLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjo1fQ"                    ]                ],                "minerData": "eyJhY2NvdW50IjoiTm9NaW5lciIsInByZWRpY2F0ZSI6IjwiLCJwdWJsaWMta2V5cyI6W119",                "transactionsHash": "OKUjjXOvSUsmlOvBb_xfcJz_1zssIMFjFi8zktn4V5E",                "outputsHash": "pfAZtwPF48paINSddff1ISBIlBeDyYBueknw9osHX4A",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "coinbase": "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6Ik5PX0NPSU5CQVNFIn0sInJlcUtleSI6IkRsZFJ3Q2JsUTdMb3F5NndZSm5hb2RIbDMwZDNqM2VILXF0RnpmRXY0NmciLCJsb2dzIjpudWxsLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjpudWxsfQ"            }        }    ],    "next": "inclusive:1ETD2LKF_gmJ92-q1fqAJY2eZerhhZA2kLxM1BC5hKE"}
json
{    "limit": 1,    "items": [        {            "header": {                "nonce": "0",                "creationTime": 1572393660000000,                "parent": "az5Y9U7gziz1nghnTMCR9pqZHApM5bqoqoU-PhWdrCU",                "adjacents": {                    "18": "uNzV6l3JEfRSbG8xI-W7dexgUR3RRbdpDzdfrJKyaZ8",                    "4": "Ou6kxMXpuwpm9uiIVhiEFHSbTdhanjHyiEh2G0EZV_w",                    "10": "QGPuG9FMAW15eqGOWSGcDna32l8oBnYFmvVBwHFNrg4"                },                "target": "MKiv2H1xBe7jlMF0WdiNF7m1HaJb6Uvec8sAAAAAAAA",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "chainId": 19,                "weight": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",                "height": 852054,                "chainwebVersion": "mainnet01",                "epochStart": 1572393660000000,                "featureFlags": 0,                "hash": "y76dr78dPJlFDMPzCc-aEz97iRyimv5Ij3psdVlC64c"            },            "payloadWithOutputs": {                "transactions": [                    [                        "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6IkxvYWRlZCBpbnRlcmZhY2UgZnVuZ2libGUtdjEifSwicmVxS2V5IjoiNDhUMExqQW5TRnBGV3h2dmFQVi1fNkUtQ2pEQVBoV1lVRldidnlmMmxGcyIsImxvZ3MiOiJRRmEyOHRuOXkydFdMVzdUc3lHdzNOTkhpYzhxYjJ6UGtudXRpWWhnQXc4IiwibWV0YURhdGEiOm51bGwsImNvbnRpbnVhdGlvbiI6bnVsbCwidHhJZCI6MH0"                    ],                    [                        "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",                        "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6IldyaXRlIHN1Y2NlZWRlZCJ9LCJyZXFLZXkiOiJCdVYtZkZKNG0xMC1YdjEyNkpwOUJoa0F6ekJLdEFkU2NNTk9GMFBkNnFjIiwibG9ncyI6IkxmMXlYSzdBVmd0VkJBOTlneWg2YWZYaU02dWVyZm9pcG8tYWZHZ3hmeUkiLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjo1fQ"                    ]                ],                "minerData": "eyJhY2NvdW50IjoiTm9NaW5lciIsInByZWRpY2F0ZSI6IjwiLCJwdWJsaWMta2V5cyI6W119",                "transactionsHash": "OKUjjXOvSUsmlOvBb_xfcJz_1zssIMFjFi8zktn4V5E",                "outputsHash": "pfAZtwPF48paINSddff1ISBIlBeDyYBueknw9osHX4A",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "coinbase": "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6Ik5PX0NPSU5CQVNFIn0sInJlcUtleSI6IkRsZFJ3Q2JsUTdMb3F5NndZSm5hb2RIbDMwZDNqM2VILXF0RnpmRXY0NmciLCJsb2dzIjpudWxsLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjpudWxsfQ"            }        }    ],    "next": "inclusive:1ETD2LKF_gmJ92-q1fqAJY2eZerhhZA2kLxM1BC5hKE"}

Get block branches

Use POST http://{baseURL}/chain/{chain}/block/branch to return blocks from branches of the block chain in descending order. A request sent to this endpoint returns blocks that are ancestors of any block specified for the upper bounds and that are not ancestors of any block specified for the lower bounds.

Path parameters

ParameterTypeDescription
chain (required)integer >= 0Specifies the chain identifier of the chain you want to send the request to. Valid values are 0 to 19. For example, to get block hashes for the first chain (0), the request is GET http://{baseURL}/chain/0/block/branch.

Query parameters

ParameterTypeDescription
limitinteger >= 0Specifies the maximum number of records that should be returned. The actual number of records returned might be lower than the value you specify. For example: limit=3.
nextstringSpecifies the cursor value to retrieve the next page of results. You can find the value to specify in the next property returned by the previous page in a successful response. For example: "inclusive:qgsxD1G5m8dGZ4W9nMKBotU2I10ilURkRIE3_UKHlLM".
minheightinteger >= 0Specifies the minimum block height for the blocks to return. For example: minheight=4471908.
maxheightinteger >= 0Specifies the maximum block height for the blocks to return. For example: maxheight=4953816.

Request body schema

Use the following parameters to specify the upper and lower bounds for the queried branches.

ParameterTypeDescription
lowerArray of stringsSpecifies the lower bound for the query. No block hashes are returned that are predecessors of any block with a hash from this array. Each block hash consists of 43 characters from the a-zA-Z0-9_- character set.
upperArray of stringsSpecifies the upper bound for the query. All returned block hashes are predecessors of a block with an hash from this array. Each block hash consists of 43 characters from the a-zA-Z0-9_- character set.

Responses

Requests to GET http://{baseURL}/chain/{chain}/block/branch can return the following response codes:

  • 200 OK indicates that the request succeeded. The response body includes all of the blocks matching the criteria specified.
  • 400 Bad Request indicates that the branch bounds were exceeded.
  • 404 Not Found indicates that no blocks matching the request criteria were found or that the next or maxheight parameter wasn't valid.
  • 406 Not Acceptable indicates that the endpoint can't generate content in the format specified by the Accept header.

Response header

The response header parameters are the same for all successful and unsuccessful Chainweb node requests.

ParameterTypeDescription
x-peer-addrstringSpecifies the host address and port number of the client as observed by the remote Chainweb node. The host address can be a domain name or an IP address in IPv4 or IPv6 format. For example: "10.36.1.3:42988".
x-server‑timestampinteger >= 0Specifies the clock time of the remote Chainweb node using the UNIX epoch timestamp. For example: 1618597601.
x‑chainweb‑node‑versionstringSpecifies the version of the remote Chainweb node. For example: "2.23".

Successful response schema

If the request is successful, the response returns application/json content with the following:

ParameterTypeDescription
items (required)Array of objectsReturns an array of JSON-encoded objects representing full blocks.
limit (required)integer >= 0Specifies the maximum number of items in the page. This number can be smaller but never larger than the number of requested items.
next (required)string or nullReturns a value that can be used to query the next page. You can use this value for the next parameter in a follow-up request. The format for this parameter consists of two parts. The first part of the string can be inclusive, exclusive or null. The second part is the value that calls the next page of results or null if there are no more results to query.

Examples

You can send a request to the Kadena main network—mainnet01—and chain 19 by calling the main network service endpoint like this:

Postman
POST http://api.chainweb.com/chainweb/0.0/mainnet01/chain/19/block/branch?limit=1
Postman
POST http://api.chainweb.com/chainweb/0.0/mainnet01/chain/19/block/branch?limit=1

In this example, the request returns the ancestors for a specific upper bound:

json
{    "lower": [ ],    "upper": ["y76dr78dPJlFDMPzCc-aEz97iRyimv5Ij3psdVlC64c"]}
json
{    "lower": [ ],    "upper": ["y76dr78dPJlFDMPzCc-aEz97iRyimv5Ij3psdVlC64c"]}

This request returns a whole block similar to the following excerpt:

json
{    "limit": 1,    "items": [        {            "header": {                "nonce": "0",                "creationTime": 1572393660000000,                "parent": "az5Y9U7gziz1nghnTMCR9pqZHApM5bqoqoU-PhWdrCU",                "adjacents": {                    "18": "uNzV6l3JEfRSbG8xI-W7dexgUR3RRbdpDzdfrJKyaZ8",                    "4": "Ou6kxMXpuwpm9uiIVhiEFHSbTdhanjHyiEh2G0EZV_w",                    "10": "QGPuG9FMAW15eqGOWSGcDna32l8oBnYFmvVBwHFNrg4"                },                "target": "MKiv2H1xBe7jlMF0WdiNF7m1HaJb6Uvec8sAAAAAAAA",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "chainId": 19,                "weight": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",                "height": 852054,                "chainwebVersion": "mainnet01",                "epochStart": 1572393660000000,                "featureFlags": 0,                "hash": "y76dr78dPJlFDMPzCc-aEz97iRyimv5Ij3psdVlC64c"            },            "payloadWithOutputs": {                "transactions": [                    [                        "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",                        "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6IldyaXRlIHN1Y2NlZWRlZCJ9LCJyZXFLZXkiOiJCdVYtZkZKNG0xMC1YdjEyNkpwOUJoa0F6ekJLdEFkU2NNTk9GMFBkNnFjIiwibG9ncyI6IkxmMXlYSzdBVmd0VkJBOTlneWg2YWZYaU02dWVyZm9pcG8tYWZHZ3hmeUkiLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjo1fQ"                    ]                ],                "minerData": "eyJhY2NvdW50IjoiTm9NaW5lciIsInByZWRpY2F0ZSI6IjwiLCJwdWJsaWMta2V5cyI6W119",                "transactionsHash": "OKUjjXOvSUsmlOvBb_xfcJz_1zssIMFjFi8zktn4V5E",                "outputsHash": "pfAZtwPF48paINSddff1ISBIlBeDyYBueknw9osHX4A",                "payloadHash": "i-MN4AoxsaPds4M_MzwNSUygAkGnPZoCDvahfckowt4",                "coinbase": "eyJnYXMiOjAsInJlc3VsdCI6eyJzdGF0dXMiOiJzdWNjZXNzIiwiZGF0YSI6Ik5PX0NPSU5CQVNFIn0sInJlcUtleSI6IkRsZFJ3Q2JsUTdMb3F5NndZSm5hb2RIbDMwZDNqM2VILXF0RnpmRXY0NmciLCJsb2dzIjpudWxsLCJtZXRhRGF0YSI6bnVsbCwiY29udGludWF0aW9uIjpudWxsLCJ0eElkIjpudWxsfQ"            }        }    ],    "next": null}
json
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