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the blockchain is public and immutable.

one should be able to go through a 24 hour section of the ledger to determine how much BTC has moved and call that trading volume

the only issues I see with this data are:

- BTC is used as both a currency and a security and distinguishing

- BTC is moved multiple times to obfuscate (read wash) transactions

[WnZ39p0Dgydaz1]

BTC moved has nothing to do with exchange trade volume. When BTC is traded on an exchange, there are no blockchain transactions involved. It's all "internal" to the exchange because the exchanges are centralized.

Trading on decentralized exchanges would result in blockchain transactions, but such exchanges have not yet caught on and make up only a tiny fraction (< 0.01%?) of trade volume. Maybe someone else has the exact numbers.