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Using Electrum desktop wallet connected to the testnet, when trying to open a channel with the amount exceeding 0.16777215 BTC I get the following:

Could not open channel. Exception('Requested channel capacity is over protocol allowed maximum')

Is 0.16777215 BTC hardcoded in Electrum or is it determined by the testnet itself? I noticed that on the mainnet the maximum capacity is siginificatly higher as some exchanges allow LN withdrawals of 0.5 BTC.

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Is 0.16777215 BTC hardcoded in Electrum or is it determined by the testnet itself?

There's no such hard coded value in Electrum. The limit is imposed by the Lightning protocol:

for channels with chain_hash identifying the Bitcoin blockchain, if the four most significant bytes of amount_msat are not 0: MUST fail the channel.

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I noticed that on the mainnet the maximum capacity is siginificatly higher as some exchanges allow LN withdrawals of 0.5 BTC

I think they are using wumbo channels:

Is the Lightning Network sufficiently secure and well tested for wumbo channels?

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