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Anatol Sevostyan edited this page May 14, 2021 · 2 revisions

Beam Fierce Fermion 6.0 Upgrade Guide for pools and exchanges

Confidential Assets

Confidential Assets (CA) are tokens mint on the Beam blockchain. Beam supports Confidential Assets since hard fork 2, but this feature had limited ability to be used in real life applications. Starting from the version 6.0 Beam Wallet adds ability to create smart contracts which make CA more usable and very important feature in Beam infrastructure. We already have API to work with CA, but it was disabled by default. If you wish to accept and create transactions with CA you should enable this feature in the wallet API and update your codebase to handle CA correctly.

New transaction types

New types of transaction are available in the wallet API:

  • Maximum privacy transaction
  • Offline transaction

In order to receive these transactions there are no need to make any changes, but if you want to send them you have to explicitly enable them in the wallet, and distinguish new address types.

New address types

We introduced new address types in CLI and Desktop wallet version 5.0, now they are available in API. We highly recommend to use these new addresses, this should bring better user experience both for sending and receiving. For backward compatibility we preserved old address type. The difference between new addresses and old are the following

  • new addresses are base58 encoded and have relatively long, old addresses are hex encoded and have length 64-67 characters
  • new addresses can hold additional data for transaction, this allows us to make new type of transactions mentioned before and add more when it will be needed

Updating wallet API

Download new binaries of the wallet API

Enable CA support

  • run new binary with --enable_assets. With this flag your wallet starts to accept transactions with Confidential Assets

        ./wallet-api --enable_assets -n <node address>

  • updated the codebase. Methods get_utxo, tx_list and wallet_status now has "assets" parameter, if you pass "assets": true these methods return data related to CA. If you wish to send or split CA you should specify "asset_id" parameter. Also there are some new methods which provide CA specific functionality (get_asset_info, tx_asset_info, tx_asset_issue, tx_asset_consume). Please, see wallet API documentation for more details.

  • add "assets": true parameter to get_utxo method to view assets

    -->

    {
    "jsonrpc":"2.0", 
    "id": 6,
    "method":"get_utxo",
    "params" :
    {
        "count": 10,
        "skip": 0,
        "assets": true,           // <------------ report assets
        "sort": {
            "field": "amount",
            "direction": "asc"
        },
        "filter": {
            "asset_id": 1         // <------------ filter assets with ID 1
        }
    }
}

  • add "assets": true parameter to tx_list method, to view report transaction list including transactions with assets

    -->

    {
    "jsonrpc":"2.0", 
    "id": 8,
    "method":"tx_list",
    "params":
    {
        "filter" :             // <--------------- you can filter buy asset_id here
        {
            "status":4,
            "height":1055,
        },
        "skip" : 0,
        "count" : 10,
        "assets": true         // <--------------- report assets too
    }
}

  • to retrieve info about assets in your wallet pass "assets": true parameter to wallet_status method, to get status of the wallet and its balance in different CAs and BEAM

    -->

    {
    "jsonrpc":"2.0", 
    "id": 6,
    "method":"wallet_status",
        "params": {
              "assets" : true
        }
}

    <--

    {
  "id": 1236,
  "jsonrpc": "2.0",
  "result": {
    "current_height": 112,
    "current_state_hash": "b9e8b868de60f28e553a1499a569f481991e4cff9fe2191d09d71a03c7708296",
    "difficulty": 378.36236572265625,
    "prev_state_hash": "3f84da0b0390deaca908603b6061867def987575a1af9311248ffb01503a0f02",
    "totals": [
      {
        "asset_id": 0,
        "available": 303000000000,
        "available_str": "303000000000",
        "maturing": 8000000000,
        "maturing_str": "8000000000",
        "receiving": 0,
        "receiving_str": "0",
        "sending": 0,
        "sending_str": "0"
      },
      {
        "asset_id": 1,                    // <--------------- this could be used to send/split CA or to retrieve extended info
        "available": 2000000000,
        "available_str": "2000000000",
        "maturing": 0,
        "maturing_str": "0",
        "receiving": 0,
        "receiving_str": "0",
        "sending": 0,
        "sending_str": "0"
      }
    ]
  }
}

  • if you want to send or split CA you should specify "asset_id" in parameters

    -->

    {
    "jsonrpc":"2.0", 
    "id": 2,
    "method":"tx_send", 
    "params":
    {
        "value": 12342342,
        "fee": 2,
        "from": "472e17b0419055ffee3b3813b98ae671579b0ac0dcd6f1a23b11a75ab148cc67",
        "address": "472e17b0419055ffee3b3813b98ae671579b0ac0dcd6f1a23b11a75ab148cc67",
        "comment": "thank you!",
        "asset_id": 1                   <------------------ NEW
    }
}

  • if you want to get info about CA use

    -->

    {
    "jsonrpc":"2.0", 
    "id": 2,
    "method": "tx_asset_info",
    "params": 
    {
        "asset_id": 1
    }
}

    <--

    {
    "jsonrpc":"2.0", 
    "id": 2,
    "result":
    {
        "txId" : "10c4b760c842433cb58339a0fafef3db"
    }
}

  • after this transaction become completed, you can read CA info from the local database

    -->

    {
    "jsonrpc":"2.0", 
    "id": 6,
    "method": "get_asset_info",
    "params" :
    {
        "asset_id": 1
    }
}
    • asset_id asset id to retrieve info about. Can be used for any asset even if you don't own it.

    <--

    {
    "id": 1236,
    "jsonrpc": "2.0",
    "result": 
    {
        "asset_id": 1,
        "emission": 2000000000,
        "emission_str": "2000000000",
        "isOwned": 1,
        "lockHeight": 39,
        "metadata": "STD:N=NAME;SN=SNM;UN=UNIT;NTHUN=NTHUNIT",
        "ownerId": "0ae08a49e018e98177774294107dc033790b87538e54a20e99c6b98f1dbd39ce",
        "refreshHeight": 927
    }
}

    Returns full asset info or error code.

    • asset_id asset id
    • metadata asset metadata
    • emission & emission_str total asset emission. Maximum asset emission is 2128-1. To ensure compatibility with JavaScript raw number returned only if it is less than or equal to Number.MAX_SAFE_INTEGER (253-1). If asset emission is greater than Number.MAX_SAFE_INTEGER only corresponding string representation is returned.
    • isOwned is 1 if you own this asset
    • lockHeight last block when asset emission turned to/from 0.
    • refreshHeight block at which asset information has been received. Please note, that all returned fields are valid only for this and previous blocks. In next blocks emission might change, asset become unregistered &c. Use tx_asset_info to retrieve the most recent info.

Enable new types of transaction

  • run new binary with --enable_lelantus. With this flag your wallet is able to send UTXO via shielded pool.

        ./wallet-api --enable_lelantus -n <node address>

Newer address type support

  • Update address verification. Now, validate_address method return additional info about address:

    <--

    {
    "jsonrpc":"2.0", 
    "id": 1,
    "result" : 
    {
        "is_valid" : true,
        "is_mine" : false,
        "type": "offline",  // <---------- NEW
        "payments": 3       // <---------- NEW
    }
}

    • type the type of address, possible values are

      • regular - regular old-style hex encoded address, default
      • offline - new-style base58 encoded address for offline transaction, could be used several times, it has no strong guaranties for privacy
      • max_privacy - new-style base58 encoded address for maximum privacy transaction, could be used once
      • public_offline - new-style base58 encoded address for offline transaction, it's constant, it provided less privacy, you could publish it, designed for donations
      • regular_new - new-style base58 encoded address for regular mimblewimble transaction

    • payments - the number of payments left in case of offline address

If you don't want to support newer type of transactions you could simply allow regular addresses.

  • regex for the newer address is: 
    /[0-9a-zA-Z]{1,1000}/

it allows both old-style and new-style addresses.

  • in order to generate new-style address pass "type" parameter to create_address method

    -->

    {
    "jsonrpc" : "2.0", 
    "id" : 1,
    "method" : "create_address", 
    "params" :
    {
        "type": "max_privacy",  // <----- NEW
        "expiration" : "auto",
        "comment" : "John Smith"
    }
}

The values for "type" parameter are the same as described earlier. If you don't specify "type" "regular" is used by default to keep backward compatibility.

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