Getting balances from a substrate node using RPC

substrate_get_balances_low_level.js

// UPDATED THANK YOU @al3mart 
util_crypto.xxhashAsHex("System", 128)
> "0x26aa394eea5630e07c48ae0c9558cef7"

util_crypto.xxhashAsHex("Account", 128)
> "0xb99d880ec681799c0cf30e8886371da9"

// https://westend.subscan.io/account/5ENpP27BrVdJTdUfY6djmcw3d3xEJ6NzSUU52CCPmGpMrdEY
util_crypto.blake2AsHex(keyring.decodeAddress("5ENpP27BrVdJTdUfY6djmcw3d3xEJ6NzSUU52CCPmGpMrdEY"), 128)
> "0xbb08f275d00049b315666c2c44130a10"

// Get the account ID from the pubkey
subkey inspect 5ENpP27BrVdJTdUfY6djmcw3d3xEJ6NzSUU52CCPmGpMrdEY
> Account ID: 0x6648d7f3382690650c681aba1b993cd11e54deb4df21a3a18c3e2177de9f7342

// System + Account + hash_of_key + raw_key
0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9bb08f275d00049b315666c2c44130a106648d7f3382690650c681aba1b993cd11e54deb4df21a3a18c3e2177de9f7342

curl -H "Content-Type: application/json" -d '{"id":1,"jsonrpc":"2.0","method":"state_getStorage","params":["0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9bb08f275d00049b315666c2c44130a106648d7f3382690650c681aba1b993cd11e54deb4df21a3a18c3e2177de9f7342"]}' https://westend-rpc.polkadot.io/
> {"jsonrpc":"2.0","result":"0xda000000000000000100000000000000f86be7c3bd31870300000000000000008094d54ee900000000000000000000000000000000000000000000000000000000000000000000000000000000000000","id":1}

// SKALE decode the raw output 
// https://www.shawntabrizi.com/substrate-js-utilities/codec/

// custom type:
{ "Balances": "(u64, u64, u64, u64, u64)" }
// decoded output 
> [218,1,"0x038731bdc3e76bf8",0,1002050000000]

// 218 == the account nonce 
// 1 (maybe the account index?) 
// 0x038731bdc3e76bf8 == 254226595075025912 == the account total balance
// 0 which probably equals the locked balance 
// 1002050000000 == the reserved balance 

^^ yeah boi

JS code example of this: https://github.com/James-Sangalli/balances-rpc-dot