package electrum import "sync/atomic" // ServerProvider manages a rotating server list, from which callers can pull server addresses. type ServerProvider struct { nextIndex int32 } // NewServerProvider returns an initialized ServerProvider. func NewServerProvider() *ServerProvider { return &ServerProvider{-1} } // NextServer returns an address from the rotating list. It's thread-safe. func (p *ServerProvider) NextServer() string { index := int(atomic.AddInt32(&p.nextIndex, 1)) return PublicServers[index%len(PublicServers)] } // PublicServers list. // // This list was taken from Electrum repositories, keeping TLS servers and excluding onion URIs. // It was then sorted into sections using the `cmd/survey` program, to prioritize the more reliable // servers with batch support. // // See https://github.com/spesmilo/electrum/blob/master/electrum/servers.json // See https://github.com/kyuupichan/electrumx/blob/master/electrumx/lib/coins.py // See `cmd/survey/main.go` var PublicServers = []string{ // Fast servers with batching "blackie.c3-soft.com:57002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.72, speed: 97, from: fortress.qtornado.com:443 "fullnode.titanconnect.ca:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.66, speed: 86, from: fortress.qtornado.com:443 "de.poiuty.com:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.76, speed: 78, from: fortress.qtornado.com:443 "2ex.digitaleveryware.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.68, speed: 68, from: fortress.qtornado.com:443 "fortress.qtornado.com:443", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.77, speed: 67, from: "hodlers.beer:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.74, speed: 64, from: fortress.qtornado.com:443 "f.keff.org:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.76, speed: 60, from: fortress.qtornado.com:443 "e2.keff.org:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.75, speed: 58, from: "electrum.stippy.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.75, speed: 56, from: fortress.qtornado.com:443 "electrum.privateservers.network:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.83, speed: 52, from: fortress.qtornado.com:443 "fulcrum.grey.pw:51002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.79, speed: 49, from: fortress.qtornado.com:443 "btc.electroncash.dk:60002", // impl: Fulcrum 1.6.0, batching: true, ttc: 0.79, speed: 49, from: fortress.qtornado.com:443 "node.degga.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.59, speed: 46, from: fortress.qtornado.com:443 "e.keff.org:50002", // impl: ElectrumX 1.10.0, batching: true, ttc: 0.76, speed: 45, from: "bitcoin.aranguren.org:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 1.25, speed: 41, from: "electrum.helali.me:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 1.20, speed: 38, from: fortress.qtornado.com:443 "node1.btccuracao.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.79, speed: 33, from: fortress.qtornado.com:443 "ASSUREDLY.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.66, speed: 20, from: electrumx.erbium.eu:50002 "assuredly.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.74, speed: 20, from: fortress.qtornado.com:443 // Other servers "smmalis37.ddns.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.56, speed: 19, from: fortress.qtornado.com:443 "electrumx.papabyte.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.95, speed: 19, from: fortress.qtornado.com:443 "electrum.bitaroo.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.98, speed: 19, from: fortress.qtornado.com:443 "electrum.exan.tech:443", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.08, speed: 19, from: fortress.qtornado.com:443 "electrum-fulcrum.toggen.net:50002", // impl: Fulcrum 1.6.0, batching: true, ttc: 1.47, speed: 16, from: fortress.qtornado.com:443 "vmd84592.contaboserver.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.79, speed: 14, from: fortress.qtornado.com:443 "gd42.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.50, speed: 12, from: fortress.qtornado.com:443 "vmd63185.contaboserver.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.75, speed: 12, from: fortress.qtornado.com:443 "alfa.cryptotrek.online:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.75, speed: 12, from: fortress.qtornado.com:443 "electrumx.ultracloud.tk:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.76, speed: 12, from: fortress.qtornado.com:443 "electrum.brainshome.de:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.89, speed: 12, from: fortress.qtornado.com:443 "ragtor.duckdns.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.91, speed: 12, from: bitcoin.aranguren.org:50002 "94.23.247.135:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 6.80, speed: 12, from: fortress.qtornado.com:443 "eai.coincited.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.12, speed: 11, from: electrumx.erbium.eu:50002 "142.93.6.38:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.56, speed: 11, from: fortress.qtornado.com:443 "157.245.172.236:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.62, speed: 11, from: fortress.qtornado.com:443 "electrum.kendigisland.xyz:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.68, speed: 11, from: fortress.qtornado.com:443 "btc.lastingcoin.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.74, speed: 11, from: fortress.qtornado.com:443 "xtrum.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.75, speed: 11, from: electrumx.erbium.eu:50002 "blkhub.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.76, speed: 11, from: fortress.qtornado.com:443 "electrumx.erbium.eu:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.78, speed: 11, from: "185.64.116.15:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.79, speed: 11, from: bitcoin.aranguren.org:50002 "188.165.206.215:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.81, speed: 11, from: fortress.qtornado.com:443 "ex03.axalgo.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.92, speed: 11, from: fortress.qtornado.com:443 "electrum.bitcoinlizard.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.98, speed: 11, from: fortress.qtornado.com:443 "btce.iiiiiii.biz:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.02, speed: 11, from: fortress.qtornado.com:443 "btc.ocf.sh:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.15, speed: 11, from: fortress.qtornado.com:443 "68.183.188.105:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.36, speed: 11, from: fortress.qtornado.com:443 "vmd71287.contaboserver.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.60, speed: 10, from: fortress.qtornado.com:443 "2electrumx.hopto.me:56022", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.89, speed: 10, from: fortress.qtornado.com:443 "electrum.emzy.de:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.15, speed: 10, from: "electrumx.electricnewyear.net:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.66, speed: 9, from: "walle.dedyn.io:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.76, speed: 8, from: fortress.qtornado.com:443 "caleb.vegas:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.80, speed: 8, from: fortress.qtornado.com:443 "electrum.neocrypto.io:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.69, speed: 7, from: fortress.qtornado.com:443 "guichet.centure.cc:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.71, speed: 7, from: fortress.qtornado.com:443 "167.172.42.31:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.75, speed: 7, from: fortress.qtornado.com:443 "2AZZARITA.hopto.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.77, speed: 7, from: fortress.qtornado.com:443 "jonas.reptiles.se:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.95, speed: 7, from: fortress.qtornado.com:443 "167.172.226.175:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.61, speed: 6, from: fortress.qtornado.com:443 "electrum-btc.leblancnet.us:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.64, speed: 6, from: fortress.qtornado.com:443 "104.248.139.211:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.90, speed: 6, from: fortress.qtornado.com:443 "elx.bitske.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.01, speed: 6, from: fortress.qtornado.com:443 "kareoke.qoppa.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.18, speed: 6, from: electrumx.erbium.eu:50002 "ex.btcmp.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.12, speed: 5, from: fortress.qtornado.com:443 "bitcoins.sk:56002", // impl: ElectrumX 1.14.0, batching: true, ttc: 0.77, speed: 3, from: fortress.qtornado.com:443 "73.92.198.54:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 5.57, speed: 0, from: fortress.qtornado.com:443 }