package electrum import "sync/atomic" // ServerProvider manages a rotating server list, from which callers can pull server addresses. type ServerProvider struct { nextIndex int32 servers []string } // NewServerProvider returns an initialized ServerProvider. func NewServerProvider(servers []string) *ServerProvider { return &ServerProvider{ nextIndex: -1, servers: servers, } } // 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 p.servers[index%len(p.servers)] } // 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 "electrum.coinext.com.br:50002", // impl: ElectrumX 1.14.0, batching: true, ttc: 0.15, speed: 113, from: "fulcrum.sethforprivacy.com:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.55, speed: 96, from: "mainnet.foundationdevices.com:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.54, speed: 88, from: "btc.lastingcoin.net:50002", // impl: Fulcrum 1.7.0, batching: true, ttc: 0.74, speed: 73, from: "vmd71287.contaboserver.net:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.60, speed: 70, from: "de.poiuty.com:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.87, speed: 70, from: "electrum.jochen-hoenicke.de:50006", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.83, speed: 69, from: "btc.cr.ypto.tech:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.81, speed: 65, from: "e.keff.org:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.82, speed: 65, from: "vmd104014.contaboserver.net:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.58, speed: 64, from: "e2.keff.org:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.83, speed: 64, from: "fulcrum.grey.pw:51002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.81, speed: 63, from: "fortress.qtornado.com:443", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.84, speed: 62, from: "f.keff.org:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.89, speed: 62, from: "2ex.digitaleveryware.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.71, speed: 61, from: "electrum.petrkr.net:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.84, speed: 58, from: "electrum.stippy.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.80, speed: 57, from: "electrum0.snel.it:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.80, speed: 56, from: "ru.poiuty.com:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.99, speed: 56, from: "electrum.privateservers.network:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.85, speed: 49, from: "btc.electroncash.dk:60002", // impl: Fulcrum 1.9.0, batching: true, ttc: 0.92, speed: 48, from: "bitcoin.aranguren.org:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 1.19, speed: 48, from: "electrum.bitcoinserver.nl:50514", // impl: Fulcrum 1.8.1, batching: true, ttc: 0.85, speed: 44, from: "btc.prompt.cash:61002", // impl: Fulcrum 1.8.1, batching: true, ttc: 1.22, speed: 44, from: "fulc.bot.nu:50002", // impl: Fulcrum 1.7.0, batching: true, ttc: 1.04, speed: 35, from: "bolt.schulzemic.net:50002", // impl: Fulcrum 1.8.2, batching: true, ttc: 0.96, speed: 33, from: "node1.btccuracao.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.90, speed: 25, from: // Other servers "xtrum.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.91, speed: 19, from: fulcrum.sethforprivacy.com:50002 "electrum.bitaroo.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.04, speed: 19, from: "btce.iiiiiii.biz:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.07, speed: 19, from: electrum.coinext.com.br:50002 "electrum.emzy.de:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.17, speed: 19, from: "alviss.coinjoined.com:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 1.15, speed: 17, from: "2AZZARITA.hopto.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.81, speed: 16, from: electrum.coinext.com.br:50002 "vmd104012.contaboserver.net:50002", // impl: Fulcrum 1.9.0, batching: true, ttc: 1.25, speed: 16, from: "electrum.bitcoinlizard.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 4.99, speed: 14, from: "btc.ocf.sh:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.19, speed: 12, from: "bitcoins.sk:56002", // impl: ElectrumX 1.14.0, batching: true, ttc: 0.80, speed: 11, from: "electrum-btc.leblancnet.us:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.04, speed: 11, from: "helicarrier.bauerj.eu:50002", // impl: ElectrumX 1.10.0, batching: true, ttc: 0.96, speed: 10, from: "electrum.neocrypto.io:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.69, speed: 7, from: "caleb.vegas:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.71, speed: 7, from: "smmalis37.ddns.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.77, speed: 7, from: "2azzarita.hopto.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.78, speed: 7, from: fulcrum.sethforprivacy.com:50002 "electrum.kendigisland.xyz:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.79, speed: 7, from: "electrum.hsmiths.com:50002", // impl: ElectrumX 1.10.0, batching: true, ttc: 0.90, speed: 7, from: "vmd63185.contaboserver.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.92, speed: 7, from: "blkhub.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.94, speed: 7, from: "electrum.mmitech.info:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.95, speed: 7, from: "elx.bitske.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.17, speed: 7, from: "bitcoin.lu.ke:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.21, speed: 7, from: "ex05.axalgo.com:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.21, speed: 7, from: "walle.dedyn.io:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.23, speed: 7, from: "eai.coincited.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.34, speed: 6, from: "2electrumx.hopto.me:56022", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.93, speed: 6, from: "hodlers.beer:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.03, speed: 6, from: "kareoke.qoppa.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.13, speed: 6, from: "ASSUREDLY.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.85, speed: 4, from: "electrumx.alexridevski.net:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.87, speed: 4, from: "assuredly.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 0.90, speed: 4, from: "ragtor.duckdns.org:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.07, speed: 4, from: "surely.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.20, speed: 4, from: "btc.electrum.bitbitnet.net:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.71, speed: 3, from: "gods-of-rock.screaminglemur.net:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.92, speed: 3, from: "SURELY.not.fyi:50002", // impl: ElectrumX 1.16.0, batching: true, ttc: 1.35, speed: 3, from: "horsey.cryptocowboys.net:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.61, speed: 2, from: "electrumx-btc.cryptonermal.net:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 0.83, speed: 1, from: "electrum.coineuskal.com:50002", // impl: ElectrumX 1.15.0, batching: true, ttc: 1.73, speed: 0, from: electrum.coinext.com.br:50002 }