Polkadot - Getting Extrinsics from a Block

curl --location 'https://api.tatum.io/v3/blockchain/node/dot-mainnet/' \
--header 'Content-Type: application/json' \
--header 'x-api-key: {YOUR_API_KEY}' \
--data '{
    "jsonrpc": "2.0",
    "method": "chain_getBlockHash",
    "params": [21453172],
    "id": 1
}'
//Response:
{
    "jsonrpc": "2.0",
    "result": "0xe45599f512e6487668031b0ef0d1df79ccdfc3eea4f7b6987eb2e64cb5acd5e1",
    "id": 1
}

curl --location 'https://api.tatum.io/v3/blockchain/node/dot-mainnet/' \
--header 'Content-Type: application/json' \
--header 'x-api-key: {YOUR_API_KEY}' \
--data '{
    "jsonrpc": "2.0",
    "method": "chain_getBlock",
    "params": ["0xe45599f512e6487668031b0ef0d1df79ccdfc3eea4f7b6987eb2e64cb5acd5e1"],
    "id": 1
}'
//Response:
{
    "jsonrpc": "2.0",
    "result": {
        "block": {
            "header": {
                "parentHash": "0x49cec4687315e7aa0b3e20926dfb5b4103fcd66678de5a0e2774b5250974c85e",
                "number": "0x1475974",
                "stateRoot": "0x20eea15eacd5b52af0398b5894eb40c02d44c94aae2e918c6b821cfdbffbe56f",
                "extrinsicsRoot": "0x480781608d53a81287a876ca2ea57e013764f786c31f8606cbeb212b146d14aa",
                "digest": {
                    "logs": [
                        "0x0642414245b501030b0000008eb6151100000000e65b7d0b72ef8b189d0215e158dd5c76588e474b82a17e51f24ec581deed764313f0531a714c511935b34d3c54df07e67d346a60ef59f117f6ce77125cf0bf0eee40269abadc70052796c7259a9f7f9fd64996c0a9affd2ff1709f5324909909",
                        "0x044245454684039950151e4e3cf24d3059738b0dfd470a702030dbac21eab570475746b8b38043",
                        "0x0542414245010136b35069302a31e006977220857f48cadb93a8722df8a106336a2b1d2003ed3ad11b0624a907c2bfa6300f7a97b6bfaef55cc9918f9af27a4067d1557256d385"
                    ]
                }
            },
            "extrinsics": [
                "0x280403000b20a0e66c9001",
                "0x228402000
              ...

# import os
# import json
import requests

# TTM_URL = os.getenv("TTM_URL")
TTM_URL = "https://api.tatum.io"
API_URL = f"{TTM_URL}/v3/blockchain/node/dot-mainnet/"
print(f"API_URL: {API_URL}")

def get_block_hash(block_number):
    payload = {
        "jsonrpc": "2.0",
        "method": "chain_getBlockHash",
        "params": [block_number],
        "id": 1
    }
    try:
        response = requests.post(API_URL, json=payload)
        response.raise_for_status()
        result = response.json()
        if 'error' in result:
            raise Exception(result['error'])
        return result.get("result")
    except requests.exceptions.RequestException as e:
        print(f"HTTP Request failed: {e}")
    except Exception as e:
        print(f"Error retrieving block hash: {e}")
    return None

def get_block_extrinsics(block_hash):
    payload = {
        "jsonrpc": "2.0",
        "method": "chain_getBlock",
        "params": [block_hash],
        "id": 1
    }
    try:
        response = requests.post(API_URL, json=payload)
        response.raise_for_status()
        result = response.json()
        # save to file as json dump
        # with open("block.json", "w") as f:
            # f.write(json.dumps(result, indent=4))
        if 'error' in result:
            raise Exception(result['error'])
        return result.get("result", {}).get("block", {}).get("extrinsics", [])
    except requests.exceptions.RequestException as e:
        print(f"HTTP Request failed: {e}")
    except Exception as e:
        print(f"Error retrieving block extrinsics: {e}")
    return []

def main():
    block_number = 21453172
    extrinsic_index = 2  # Specific extrinsic index we are looking for
    block_hash = get_block_hash(block_number)
    print(f"Block hash for block {block_number}: {block_hash}")
    if block_hash:
        extrinsics = get_block_extrinsics(block_hash)
        if extrinsics:
            if extrinsic_index < len(extrinsics):
                print(f"Extrinsic at index {extrinsic_index}:", extrinsics[extrinsic_index])
            else:
                print(f"Extrinsic at index {extrinsic_index} not found in block {block_number}")
        else:
            print(f"No extrinsics found for block hash {block_hash}")
    else:
        print(f"Block hash for block {block_number} not found")

if __name__ == "__main__":
    main()