EOS series-use cleos (command line) to initiate a bare package transaction

eos constructs naked transactions and signs

1. Data that needs to be obtained on the chain

• Obtain ref_block_prefix
  1. get_infoTo get the last irreversible block number: last_irreversible_block_num
     this is a screenshot
  2. get_blockGet information about the block: this is a screenshot
  3. To find out the ref_block_prefixdata

2.1 After that, unsigned transaction data can be constructed offline locally

• Then calculate ref_block_num

  const ref_block_num = (info.last_irreversible_block_num) & 0xFFFF
  

• expiration:

  • Current system time (calculated in the same time zone as the node) + 300 seconds (cleos defaults to 30 seconds)

• Coding structure data:

  1. Assembly object

     {
             
             
       "code": "eosio.token",
       "action": "transfer",
       "args": {
             
             
         "from": "fromaccount",
         "to": "toaccount",
         "quantity": "1.0000 EOS",
         "memo": "memo"
       }
     }
     

  2. coding

     Reference https://developers.eos.io/eosio-nodeos/reference#abi_bin_to_json

     Reference https://github.com/OracleChain/PocketEOS-IOS/blob/ca34cd96ebaa773d806a6aa7ddf913504d6a66d5/pocketEOS/SecureModule/EC/EosByteWriter.m

  3. Required to construct action through api interfacedata

     curl http://192.168.1.201:30088/v1/chain/abi_json_to_bin -X POST -d '{"code":"eosio.token", "action":"transfer", "args":{"from":"xxx", "to":"xxx", "quantity":"xxx", "memo":"xxx"}}'
     

• signature

  • chainid
  • sha256
  • ECDSA-K1

Construction result (unsigned)

{
    
    
    "compression": "none",
    "transaction": {
    
    
        "expiration": "2018-08-01T06:11:23",
        "ref_block_num": 10855,
        "ref_block_prefix": 473148127,
        "max_net_usage_words": 0,
        "max_cpu_usage_ms": 0,
        "delay_sec": 0,
        "context_free_actions": [],
        "actions": [{
    
    
            "account": "eosio.token",
            "name": "transfer",
            "authorization": [{
    
    
                "actor": "fromaccount",
                "permission": "active"
            }],
            "data": "0000000000ea305500000000487a2b9d102700000000000004454f53000000001163726561746564206279206e6f70726f6d"
        }],
        "transaction_extensions": [],
        "signatures": null,
        "context_free_data": []
    },
    "signatures": ["SIG_K1_JwLVG5pRdhvLfJGWkDEBPa7wdLbNeqeRFdvFrKDEryahSwCRpPb75m4auZh8frq6cXsm3dHit8GMbmuuBWxEjH"]
}

2.2 Unsigned transaction data can also be constructed through the cleos command

cleos push action eosio.token transfer '{"from":"xxx", "to":"xxx", "quantity":"xxx", "memo":"xxx"}' -p fromaccount@active -jds

-j:	print result as json
-d:	don't broadcast transaction to the network (just print to stdout)
-s:	Specify if unlocked wallet keys should be used to sign transaction

3. Sign and send transaction

Use the [transaction json] constructed above, sign with the private key passed in, and send the transaction

./cleos sign -p -k [private-key] '[transaction json]'

-k,--private-key TEXT       The private key that will be used to sign the transaction
-p,--push-transaction       Push transaction after signing