Construction-payloads

Intermediate

Tutorial

This section details how to call the construction/payloads endpoint of the Rosetta construction API. The request and response types can be found in the official documentation. The payloads endpoint is responsible for providing the necessary payload that needs to be signed by the sender of the transaction.

Payloads request structure

Additionally to the set of operations and the required public keys the user has the option to specify a few things in the metadata. These are comprised of two types of metadata:

• Non-request-specific metadata: These are options that can be set by the user that are independent of the request type that is being made.
  • ingress_start: This field stipulates from which point in time onwards the request should be valid from. If not set this field will be set to the current time by Rosetta.
  • ingress_end: This field determines until when the request will be valid. The returned unsigned transaction is only valid until this point in time.
• Request-Specific metadata: These are options that can be set for specific request types. For ICP Rosetta they are relevant for TRANSACTION request types.
  • memo: See the section for memo for the ICP ledger.
  • created_at_time: See the section for created_at_time for the ICP ledger.

Payloads-return structure

There are multiple payloads that need to be signed by the user. The reason for that is twofold:

• The first reason has to do with how ICP processes requests. For a call to ICP to be successful and for the user to be able to read the response of the call, two HTTP calls have to be made:

    - The first HTTP call (`Call Request`) contains all the information that ICP needs to know to be able to call 
    the correct canister with the desired arguments. This call returns an ID which essentially serves as a ticket for 
    the caller. With this ticket a user can then query ICP periodically (`Read-State Request`) and essentially ask 
    whether the original request has been processed and if there is a response. If the latter is true, ICP will return 
    the result in bytes. The Rosetta-API then converts these bytes into a readable format. This is why for every 
    transaction that is requested from the user, there must be at least two payloads. 
    

• The second reason has to do with how ICP validates requests. Every Call Request and Read-State Request need to be forwarded to ICP with a valid signature that is associated with each of these requests. Every request is only valid for a limited period of time (EXPIRY_INTERVAL). This time interval is in the range of a couple of minutes. To extend the overall time period in which the transaction can be posted, Rosetta will create a set of payloads with each being valid for a specific time interval. Together the payloads in this set cover the entire requested time period. For example, if the EXPIRY_INTERVAL was 5 minutes and the requested time period is 20 minutes from now, Rosetta would need to create at least 20/5 payloads for each Call Request and Read-State Request. This amounts to a total of at least 20/5*2 payloads for this example.

An example of a call to the payloads endpoint would resemble the following. This example does not set any metadata, so the unsigned transaction that is returned will be valid for the next 4 minutes. This time interval is set by Rosetta and can be changed by setting ingress_end. The created_at_time will be set to the current time if not provided and the memo will be left blank.

curl --location '0.0.0.0:8081/construction/payloads'  --header 'Content-Type: application/json' --data '{
    "network_identifier": {
    "blockchain": "Internet Computer",
    "network": "00000000000000020101"
  },
  "public_keys": [
    {
      "hex_bytes": "047a83e378053f87b49aeae53b3ed274c8b2ffbe59d9a51e3c4d850ca8ac1684f7131b778317c0db04de661c7d08321d60c0507868af41fe3150d21b3c6c757367",
      "curve_type": "secp256k1"
    }
  ],
  "operations": [
    {
      "operation_identifier": {
        "index": 0
      },
      "type": "TRANSACTION",
      "account": {
        "address": "8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4"
      },
      "amount": {
        "value": "-10",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    },
    {
      "operation_identifier": {
        "index": 1
      },
      "type": "TRANSACTION",
      "account": {
        "address": "7f622708b363917e3ba0ef8ac1cb0dfe241ef5ffca54f32c1480473ee3a12cad"
      },
      "amount": {
        "value": "10",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    },
    {
      "operation_identifier": {
        "index": 2
      },
      "type": "FEE",
      "account": {
        "address": "8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4"
      },
      "amount": {
        "value": "-10000",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    }
  ]
}'

The returned object contains an unsigned transaction as well as the payloads. The unsigned transaction is the in hex format serialized content that is sent to ICP. It contains all information that a replica needs to determine which canister to call, at what endpoint, and with which function parameters. The payloads are stipulated by the Rosetta-API standard and each payload gives information about which account has to sign what bytes in order for the unsigned transaction to be converted into a signed transaction successfully.

In the case of this example, there are two returned payloads: one for the Call Request and the other for the Read-State Request. Both of these payloads will need to be signed in the next step. The unsigned transaction will thus be valid for the next 4 minutes since we did not specify any ingress_interval.

{'unsigned_transaction': 'a2677570646174657381826b5452414e53414354494f4ea56b63616e69737465725f69644a000000000000000201016b6d6574686f645f6e616d656773656e645f70626361726758480a0b08baea959fe0a9e58dbd0112040a02080a1a0308904e2a220a207f622708b363917e3ba0ef8ac1cb0dfe241ef5ffca54f32c1480473ee3a12cad3a0a0899d9c88df3d893e0176673656e646572581d2e70031d8e7ff922b6ad9f2a9eb3c1e77ffa7b6c0d0120dd4ac7e4f7026e696e67726573735f6578706972790070696e67726573735f6578706972696573811b17c04eff12cf8023', 'payloads': [{'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573748c85871f2b1d1edea73797b31cd63094fa82052fed84c06d45d6c719170d8f6f', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573747a67e99e9f5e1cdfa741f8f757bb8c04f00a5fdb20a68bb273ce80973af7a6de', 'signature_type': 'ecdsa'}]}

Here is an example call that sets the ingress_start time to the current time, the ingress_end time to an hour from now. The created_at_time is also set to the current time, and the memo is set to 1234.

curl --location '0.0.0.0:8081/construction/payloads'  --header 'Content-Type: application/json' --data '{
  "network_identifier": {
    "blockchain": "Internet Computer",
    "network": "00000000000000020101"
  },
  "public_keys": [
    {
      "hex_bytes": "047a83e378053f87b49aeae53b3ed274c8b2ffbe59d9a51e3c4d850ca8ac1684f7131b778317c0db04de661c7d08321d60c0507868af41fe3150d21b3c6c757367",
      "curve_type": "secp256k1"
    }
  ],
  "operations": [
    {
      "operation_identifier": {
        "index": 0
      },
      "type": "TRANSACTION",
      "account": {
        "address": "8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4"
      },
      "amount": {
        "value": "-10",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    },
    {
      "operation_identifier": {
        "index": 1
      },
      "type": "TRANSACTION",
      "account": {
        "address": "7f622708b363917e3ba0ef8ac1cb0dfe241ef5ffca54f32c1480473ee3a12cad"
      },
      "amount": {
        "value": "10",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    },
    {
      "operation_identifier": {
        "index": 2
      },
      "type": "FEE",
      "account": {
        "address": "8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4"
      },
      "amount": {
        "value": "-10000",
        "currency": {
          "symbol": "ICP",
          "decimals": 8
        }
      }
    }
  ],
  "metadata": {
    "created_at_time": 1711114402000000000,
    "memo": 1234,
    "ingress_start": 1711114402000000000,
    "ingress_end": 1711118002000000000
  }
}'

The response object is considerably larger, as Rosetta will create multiple payloads to make up a vector of valid unsigned transactions which can be posted any time between ingress_start and ingress_end. To account for edge cases around the time that an unsigned transaction expires, with respect to the expiry time, Rosetta creates overlapping payloads. This means that if the first payload p1 is valid from t0 until t0 + 4[min], then the next payload p2 will be valid from t0 + 4[min] - 1[min]. If you want to post the transaction around the timestamp t0 + 4[min] you would run into issues if you only used p1. However, with this overlap of expiry timeframes, the payload with the most remaining time where it is valid is chosen, in this case it would be p2.

{'unsigned_transaction': 'a2677570646174657381826b5452414e53414354494f4ea56b63616e69737465725f69644a000000000000000201016b6d6574686f645f6e616d656773656e645f70626361726758400a0308d20912040a02080a1a0308904e2a220a207f622708b363917e3ba0ef8ac1cb0dfe241ef5ffca54f32c1480473ee3a12cad3a0a0880a88faab9afc6df176673656e646572581d2e70031d8e7ff922b6ad9f2a9eb3c1e77ffa7b6c0d0120dd4ac7e4f7026e696e67726573735f6578706972790070696e67726573735f6578706972696573981e1b17bf19b3766134001b17bf19cf66efe4001b17bf19eb577e94001b17bf1a07480d44001b17bf1a23389bf4001b17bf1a3f292aa4001b17bf1a5b19b954001b17bf1a770a4804001b17bf1a92fad6b4001b17bf1aaeeb6564001b17bf1acadbf414001b17bf1ae6cc82c4001b17bf1b02bd1174001b17bf1b1eada024001b17bf1b3a9e2ed4001b17bf1b568ebd84001b17bf1b727f4c34001b17bf1b8e6fdae4001b17bf1baa606994001b17bf1bc650f844001b17bf1be24186f4001b17bf1bfe3215a4001b17bf1c1a22a454001b17bf1c36133304001b17bf1c5203c1b4001b17bf1c6df45064001b17bf1c89e4df14001b17bf1ca5d56dc4001b17bf1cc1c5fc74001b17bf1cddb68b2400', 'payloads': [{'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573748776ff8cadde7db2869b982613605b8ffc589c8076c9d218938dd34bceb65053', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573740cb2acc0f1e8d4bb5c548c314366e054546a0f12c0812ca7d79f5054417c4766', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374c667c1bfee121306e47efc786975d24bc45ef695ab136984686fe05807b5d3fc', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374ae6c99721423e443cbee85a412758a3c648af6343083ef33f4561a9a6e9a0e90', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374840797507bff7f2e414f5de66485aa1472c4c22ec6fe74a3e2055a05d68d2990', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374b61bc3f40a8c4b0797caadabf2e7ec8be4e83b08a77ff741a8392fb5bb50e997', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374c73a424262bd16be54e66454810a9e044029407cee6a51fc9329f341c2a07be7', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d7265717565737451ff8666ae06d35298e64e95feaf15925d26d022bcf2f9757cefd2e1ad9234a0', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374235f797fcb30fee026103498ecf2c3ae31471aa8df9e37775a6e53d3d39822bc', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573747f6300ffabb785fb729872e80d2d5b5779a55653d32e737e33c6087f87440136', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374f41be959d8964e89297749e4dcdb842b0c40040b468929c300784520873e010c', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374bfc2ad014c96d845a3ba909566e3ac2ef559f413d0ada3634e8571af8cde221b', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573747602e0b73155acd4164b38f1fce7190adf22b8c2be9458a8a7020b9bc8a035d6', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374576014eeed8f969b6d8282ea809f5463abcfee4fe1b85c66ed2558a1bccf9d2e', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573749b9b0982e759f36d64112c36240baae20f74a950456f85f476173c0e1d7a1112', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d7265717565737495a3c640d6afa4788566871b4e9005564050f5a50db982669734bc565c02a571', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374225b80f8c6b8b0b7c9530d76b7ae2105db2a5928693ecb83eaa2b94417065548', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374975b57eb2e361dfd725e216d17faa1a7e33f8f07571f2fb0f511a9a9cbd188b3', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374a97c5f07aa93de14d35acd02589f910037ec9b2905c8122afccfe4b450c2c87c', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d7265717565737478e6451c4a152eb21c5cf592a15cc614da4fe2974b8035f1d9289845ba8ec441', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573749e8c5d45ddc058b079b4e2d55d7e648e0592d928a3f16e46a28a403a4a5353bd', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374a71a256363ffe14f72e4d7089b2d8bd5eb146828af8f42f06b991a497f8248f8', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d72657175657374af91da9bb735a3e019d2040ee8d256028ee15ab903154bbfe719b1848895c799', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573746c5d45bae14d7dbfbfe8c457f7ec5f90fadd84998fa1e4b4a82b3d5b3e78df3b', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573745679674251d700e27898126831718c357a51207ea576f8ca98311cd511620424', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573748527d97c6c73ed5b029185e9ff1e6ae43d6be6c63cd4a1625c80e58a9b0a27c1', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d7265717565737477b3732e005efacdbf199232458b4fd944afa8c6b02ffc596609f9f8cecd2124', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': '8b84c3a3529d02a9decb5b1a27e7c8d886e17e07ea0a538269697ef09c2a27b4'}, 'hex_bytes': '0a69632d726571756573745ff9e9b9dd96e7d178556950396ec4728799ba5d951fa8c97988bdd559e2c90a', 'signature_type': 'ecdsa'}, {'account_identifier': {'address': 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