BTC mining URL includes two types:
1) General Mining URL: if you use general mining URL, Poolin will automatically allocate a mining URL of a node that is most close to your miners.
2) Mining URL of Different Nodes: BTC now has three mining nodes, including China (Beijing) , USA (Virginia) and Europe (Frankfurt). You can select one mining url that is most close to your miners.
1）General Mining URL：
url1: stratum+tcp://btc.ss.poolin.me:443
url2: stratum+tcp://btc.ss.poolin.me:1883
url3: stratum+tcp://btc.ss.poolin.me:700
2）Mining URL of Different Nodes：
Beijing Node
url1: stratum+tcp://btc-bj.ss.poolin.me:443
url2: stratum+tcp://btc-bj.ss.poolin.me:1883
url3: stratum+tcp://btc-bj.ss.poolin.me:700
Chengdu Node
url1: stratum+tcp://btc-cd.ss.poolin.me:443
url2: stratum+tcp://btc-cd.ss.poolin.me:1883
url3: stratum+tcp://btc-cd.ss.poolin.me:700
Virginia Node
url1: stratum+tcp://btc-va.ss.poolin.me:443
url2: stratum+tcp://btc-va.ss.poolin.me:1883
url3: stratum+tcp://btc-va.ss.poolin.me:700
Frankfurt Node
url1: stratum+tcp://btc-fra.ss.poolin.me:443
url2: stratum+tcp://btc-fra.ss.poolin.me:1883
url3: stratum+tcp://btc-fra.ss.poolin.me:700
Note: Mining URL with 443 port is recommended