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Currently there are 35 million unspent transaction outputs. Is there a site somewhere where I can query this data to see, for instance, how many UTXO's exist with a value less than 20,000 satoshis? Or the total unique scriptPubKey values found in a UTXOs?
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The standard bitcoind core daemon has no methods to query the UTXO set for reasons I don't know: it should be trivial to give access to it even on a pruned node since it needs to have the full UTXO set at any time to validate a new block.
Anyway a pull request seems in progress to add this capability: https://github.com/bitcoin/bitcoin/pull/8952
There are anyway third party apis to query a single address, for example https://www.blockcypher.com/dev/ or https://chain.so/api
The pull request you refer to improves the listunspent RPC, which queries the wallet. It does not give you access to the network-side UTXO set. The does exist a gettxout RPC, however. – Pieter Wuille – 2017-04-17T07:43:58.167
Thanks, I misinterpreted. Anyway I'm still at a loss in understanding why there is no way to query the UTXO. A simple command to check if tx/index is in the UTXO would be a great start, for example. – Alessandro Polverini – 2017-04-17T16:33:20.510
1That exists, it is called gettxout. – Pieter Wuille – 2017-04-17T17:42:47.277
@AlessandroPolverini did you find the answer to your question? – D L – 2017-06-26T13:14:04.927
No, I haven't find any method to list all the UTXO: you already have to know it to query one out of a tx. – Alessandro Polverini – 2017-06-27T09:28:54.420
To my knowledge, there is no such site. You could get this with some coding. For example accessing a node's levelDB; see chainstate db keys in the accepted answer of this question.
– karask – 2016-04-25T08:17:37.790