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This is the code from https://developer.bitcoin.org/examples/p2p_networking.html on how to retrieve a merkle block:
#!/usr/bin/env python
from time import sleep
from hashlib import sha256
import struct
import sys
network_string = "f9beb4d9".decode("hex") # Mainnet
def send(msg,payload): ## Command is ASCII text, null padded to 12 bytes command = msg + ( ( 12 - len(msg) ) * "\00" ) ## Payload length is a uint32_t payload_raw = payload.decode("hex") payload_len = struct.pack("I", len(payload_raw)) ## Checksum is first 4 bytes of SHA256(SHA256(<payload>)) checksum = sha256(sha256(payload_raw).digest()).digest()[:4] sys.stdout.write( network_string + command + payload_len + checksum + payload_raw ) sys.stdout.flush()
## Create a version message
send("version", "71110100" # ........................ Protocol Version: 70001 + "0000000000000000" # ................ Services: Headers Only (SPV) + "c6925e5400000000" # ................ Time: 1415484102 + "00000000000000000000000000000000" + "0000ffff7f000001208d" # ............ Receiver IP Address/Port + "00000000000000000000000000000000" + "0000ffff7f000001208d" # ............ Sender IP Address/Port + "0000000000000000" # ................ Nonce (not used here) + "1b" # .............................. Bytes in version string + "2f426974636f696e2e6f726720457861" + "6d706c653a302e392e332f" # .......... Version string + "93050500" # ........................ Starting block height: 329107 + "00" # .............................. Relay transactions: false
)
sleep(1)
send("verack", "")
send("filterload", "02" # ........ Filter bytes: 2 + "b50f" # ....... Filter: 1010 1101 1111 0000 + "0b000000" # ... nHashFuncs: 11 + "00000000" # ... nTweak: 0/none + "00" # ......... nFlags: BLOOM_UPDATE_NONE
)
send("getdata", "01" # ................................. Number of inventories: 1 + "03000000" # ........................... Inventory type: filtered block + "a4deb66c0d726b0aefb03ed51be407fb" + "ad7331c6e8f9eef231b7000000000000" # ... Block header hash
)But the code above doesn't run, thus I made some amendments (if not the error that 'bytes can't concat to strings' will be displayed) to this part:
sys.stdout.write( str(network_string) + command + str(payload_len) + str(checksum) + str(payload_raw) )
Thereafter, I ran -bitcoind daemon before piping the script to Unix netcat command:
# Connect to the Bitcoin Core peer running on localhost python get-merkle.py | nc localhost 8333 | hd
But to no response.
The expected response is:
7f16c5962e8bd963659c793ce370d95f 093bc7e367117b3c30c1f8fdd0d97287 ... Merkle root 07000000 ........................... Transaction count: 7 04 ................................. Hash count: 4 3612262624047ee87660be1a707519a4 43b1c1ce3d248cbfc6c15870f6c5daa2 ... Hash #1 019f5b01d4195ecbc9398fbf3c3b1fa9 bb3183301d7a1fb3bd174fcfa40a2b65 ... Hash #2 41ed70551dd7e841883ab8f0b16bf041 76b7d1480e4f0af9f3d4c3595768d068 ... Hash #3 20d2a7bc994987302e5b1ac80fc425fe 25f8b63169ea78e68fbaaefa59379bbf ... Hash #4 01 ................................. Flag bytes: 1 1d ................................. Flags: 1 0 1 1 1 0 0 0
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