BlockCypher Send Transaction - ethereum

Question

I am trying to implement the BlockCypher Ethereum API following the docs here:
https://www.blockcypher.com/dev/ethereum/#transaction-api
I am using the Test Network /beth/test, rather than /eth/main.
I successfully created 2 addresses and called the faucet to fill one address with some 1000000000000000000 wei.
But then I can’t seem to be able to send a valid transaction…
Here are all (test) info:
ADDRESS 1
{
"private": "42eb005cbebd33f55b821864fcdc0755876317345ac9d8ad2bf94d734f78395f",
"public": "04c7238abb2e99c50ef3e4fabe21dbf2701f9dc60de24b40e743e84745984957ba7059a3e0b38c226b3580a95ed0e154fba407d089f5c02f90aa5797ead7fc190e",
"address": "7a9373010ce86d8fcd7dd46588d351cddabe7ce8"
}
ADDRESS 2
{
"private": "4a62456df43b89244d349948008064cfe1279ef3a632823f30b371ac54f879a1",
"public": "046c01b338e3c5224aa70fa302fefa5c9767d0f79aa16327e703d01924e894809460b22ab52974706543682d8e16063fd6cbd302b052762a3be5d7720efc4d2fa9",
"address": "73befec27510c64c303d82191eaf276a94603090"
}
Address 2 contains 1000000000000000000 wei, and I am trying to send 1200000000000000 wei to Address 1.
I use the New Transaction method, I send this:
{"inputs":[{"addresses": ["73befec27510c64c303d82191eaf276a94603090"]}],"outputs":[{"addresses": ["7a9373010ce86d8fcd7dd46588d351cddabe7ce8"], "value": 1200000000000000}]}
And I get this response:
{
"tx": {
"block_height": -1,
"block_index": 0,
"hash": "4e875a673e59f0b2d16123659b3a72a8d818a7cb832c5ed1a4bbf8f5b0a4ee87",
"addresses": [
"73befec27510c64c303d82191eaf276a94603090"
],
"total": 1200000000000000,
"fees": 21000000000000,
"size": 43,
"gas_limit": 21000,
"gas_price": 1000000000,
"received": "2018-05-27T13:51:23.247159854Z",
"ver": 0,
"double_spend": false,
"vin_sz": 1,
"vout_sz": 1,
"inputs": [
{
"sequence": 0,
"addresses": [
"73befec27510c64c303d82191eaf276a94603090"
]
}
],
"outputs": [
{
"value": 1200000000000000,
"addresses": [
"7a9373010ce86d8fcd7dd46588d351cddabe7ce8"
]
}
]
},
"tosign": [
"8b765bd6c2065f612eb00aa55c50759049779cff50151395aefc5a3dafa5cc10"
]
}
Then I use Signer with the ToSign from the New Transaction response, and a Hex-Encoded Private Key of Address 2:
signer 8b765bd6c2065f612eb00aa55c50759049779cff50151395aefc5a3dafa5cc10 34613632343536646634336238393234346433343939343830303830363463666531323739656633613633323832336633306233373161633534663837396131
I get this signature:
30440220644db87755b0a8620e7e52bd64977c79350c0989afd587090be13a8f76efbf3a0220463eb6351c839b086f5874f6a125ec4723fb30eb26a6a831600cb4d3034cd9d3
So then I try the Send Transaction method of BlockCypher, here’s my request:
{
"tx": {
"block_height": -1,
"block_index": 0,
"hash": "4e875a673e59f0b2d16123659b3a72a8d818a7cb832c5ed1a4bbf8f5b0a4ee87",
"addresses": [
"73befec27510c64c303d82191eaf276a94603090"
],
"total": 1200000000000000,
"fees": 21000000000000,
"size": 43,
"gas_limit": 21000,
"gas_price": 1000000000,
"received": "2018-05-27T13:51:23.247159854Z",
"ver": 0,
"double_spend": false,
"vin_sz": 1,
"vout_sz": 1,
"inputs": [
{
"sequence": 0,
"addresses": [
"73befec27510c64c303d82191eaf276a94603090"
]
}
],
"outputs": [
{
"value": 1200000000000000,
"addresses": [
"7a9373010ce86d8fcd7dd46588d351cddabe7ce8"
]
}
]
},
"tosign": [
"8b765bd6c2065f612eb00aa55c50759049779cff50151395aefc5a3dafa5cc10"
],
"pubkeys": ["046c01b338e3c5224aa70fa302fefa5c9767d0f79aa16327e703d01924e894809460b22ab52974706543682d8e16063fd6cbd302b052762a3be5d7720efc4d2fa9"],
"signatures": ["30440220644db87755b0a8620e7e52bd64977c79350c0989afd587090be13a8f76efbf3a0220463eb6351c839b086f5874f6a125ec4723fb30eb26a6a831600cb4d3034cd9d3"]
}
And I get back this error:
"Address 0xF6A14d976c86bDbe050cA9426aD491d750be33B1 computed from signature differs from provided one 73befec27510c64c303d82191eaf276a94603090."
Any idea of what am I doing wrong?
I tried several things already, read a few similar issues online, but still no luck.
I also tried the Raw Transaction method of BlockCypher, and also no luck there..
I am not clear what it means as “raw hex-encoded transaction”, I tried to send the Hex-Encoded input I sent to New Transaction:
{"inputs":[{"addresses": ["73befec27510c64c303d82191eaf276a94603090"]}],"outputs":[{"addresses": ["7a9373010ce86d8fcd7dd46588d351cddabe7ce8"], "value": 1200000000000000}]}
So I sent to https://api.blockcypher.com/v1/beth/test/txs/push?token=[mytoken] this:
{"tx":"22696E70757473223A5B7B22616464726573736573223A205B2237336265666563323735313063363463333033643832313931656166323736613934363033303930225D7D5D2C226F757470757473223A5B7B22616464726573736573223A205B2237613933373330313063653836643866636437646434363538386433353163646461626537636538225D2C202276616C7565223A20313230303030303030303030303030307D5D"}
But I get the error:
“rlp: expected input list for types.TxData”.
Please, any help is very much appreciated!

Answer 1

The private key you're passing to the signer tool is not correct. As Address 2 is the sender in your example, you should be using its private key instead, which is 4a62456df43b89244d349948008064cfe1279ef3a632823f30b371ac54f879a1.