curl --request POST \
  --url https://example.com/account/coins \
  --header 'Content-Type: application/json' \
  --data '{
  "network_identifier": {
    "blockchain": "bitcoin",
    "network": "mainnet",
    "sub_network_identifier": {
      "network": "shard 1",
      "metadata": {
        "producer": "0x52bc44d5378309ee2abf1539bf71de1b7d7be3b5"
      }
    }
  },
  "account_identifier": {
    "address": "0x3a065000ab4183c6bf581dc1e55a605455fc6d61",
    "sub_account": {
      "address": "0x6b175474e89094c44da98b954eedeac495271d0f",
      "metadata": {}
    },
    "metadata": {}
  },
  "include_mempool": true,
  "currencies": [
    {
      "symbol": "BTC",
      "decimals": 8,
      "metadata": {
        "Issuer": "Satoshi"
      }
    }
  ]
}'

{
  "block_identifier": {
    "index": 1123941,
    "hash": "0x1f2cc6c5027d2f201a5453ad1119574d2aed23a392654742ac3c78783c071f85"
  },
  "coins": [
    {
      "coin_identifier": {
        "identifier": "0x2f23fd8cca835af21f3ac375bac601f97ead75f2e79143bdf71fe2c4be043e8f:1"
      },
      "amount": {
        "value": "1238089899992",
        "currency": {
          "symbol": "BTC",
          "decimals": 8,
          "metadata": {
            "Issuer": "Satoshi"
          }
        },
        "metadata": {}
      }
    }
  ],
  "metadata": {
    "sequence_number": 23
  }
}