​
Network Identifier

Schema The network_identifier specifies which network a particular object is associated with. 
{
  "blockchain": "bitcoin",
  "network": "mainnet",
  "sub_network_identifier": {
    "network": "shard 1",
    "metadata": {
      "producer": "0x52bc44d5378309ee2abf1539bf71de1b7d7be3b5"
    }
  }
}

​
Sub-Network Identifier

Schema In blockchains with sharded state, the SubNetworkIdentifier is required to query some object on a specific shard. This identifier is optional for all non-sharded blockchains. 
{
  "network": "shard 1",
  "metadata": {
    "producer": "0x52bc44d5378309ee2abf1539bf71de1b7d7be3b5"
  }
}

​
Block Identifier

Schema The block_identifier uniquely identifies a block in a particular network. 
{
  "index": 1123941,
  "hash": "0x1f2cc6c5027d2f201a5453ad1119574d2aed23a392654742ac3c78783c071f85"
}

​
Transaction Identifier

Schema The transaction_identifier uniquely identifies a transaction in a particular network and block or in the mempool. 
{
  "hash": "0x2f23fd8cca835af21f3ac375bac601f97ead75f2e79143bdf71fe2c4be043e8f"
}

​
Operation Identifier

Schema The operation_identifier uniquely identifies an operation within a transaction. 
{
  "index": 5,
  "network_index": 0
}

​
Account Identifier

Schema The account_identifier uniquely identifies an account within a network. All fields in the account_identifier are utilized to determine this uniqueness (including the metadata field, if populated). 
{
  "address": "0x3a065000ab4183c6bf581dc1e55a605455fc6d61",
  "sub_account": {
    "address": "0x6b175474e89094c44da98b954eedeac495271d0f",
    "metadata": {}
  },
  "metadata": {}
}

​
Sub-Account Identifier

Schema An account may have state specific to a contract address (ERC-20 token) and/or a stake (delegated balance). The sub_account_identifier should specify which state (if applicable) an account instantiation refers to. 
{
  "address": "0x6b175474e89094c44da98b954eedeac495271d0f",
  "metadata": {}
}