Based on the following blockchain json data, I picked a random transaction and want to understand the amounts transacted:
source: https://blockchain.info/block-height/502070?format=json
{
"lock_time":502039,
"ver":1,
"size":225,
"inputs":[
{
"sequence":4294967294,
"witness":"",
"prev_out":{
"spent":true,
"tx_index":318981069,
"type":0,
"addr":"1MppuHQwHjmYunvpzd8LjHMKDhtk2974aD",
"value":153295388,
"n":0,
"script":"76a914e46e0d4e9420768f3b0925069f92fdde2136d5db88ac"
},
"script":"47304402207f77cd1b8e82bba37b0d0636fa9f10b67f1aebd3cc20ff30223495825f1af8200220300ae8a8985e9a183ff5522dc86421eff5592dc74e96750330501b41d61de99f012102acb5fd6d1f86719ee9a0c0da3d7a0d63a068cba7c123c2e77988d130884b20c3"
}
],
"weight":900,
"time":1514824905,
"tx_index":318988523,
"vin_sz":1,
"hash":"a712e4036222c2cc821443bfbbeb33f94903d2fee08b8e8f1eccada75cf6a9d8",
"vout_sz":2,
"relayed_by":"0.0.0.0",
"out":[
{
"spent":true,
"tx_index":318988523,
"type":0,
"addr":"1AeqgtHedfA2yVXH6GiKLS2JGkfWfgyTC6",
"value":500000,
"n":0,
"script":"76a91469e12a40d4a2218d33f208b9a0447894dc9bea3188ac"
},
{
"spent":true,
"tx_index":318988523,
"type":0,
"addr":"1GawcJQjTQtzYUX2wgxfbjDTQcVJiPLUqW",
"value":151985709,
"n":1,
"script":"76a914aaf532cf834863dcdeb4164ec3a4ab413619d98388ac"
}
]
}
Based on this I would guess that the input address sent 153295388 satoshis. And the two out addresses both received some satoshis, but the sum do not add up:
153295388 - 500000 - 151985709 = 809679
I see a difference of 809679 satoshis between the input and the sum of output. Is that the transaction fee, and if yes, how is this decided?