getmempoolancestors

If txid is in the mempool, returns all in-mempool ancestors.

Parameters:

string, required. The transaction id (must be in mempool)

boolean, optional, default=false. True for a json object, false for array of transaction ids

Returns:

for verbose = false

[           (json array)
  "hex",    (string) The transaction id of an in-mempool ancestor transaction
  ...
]

for verbose = true

{                                         (json object)
  "transactionid" : {                     (json object)
    "vsize" : n,                          (numeric) virtual transaction size as defined in BIP 141. This is different from actual serialized size for witness transactions as witness data is discounted.
    "weight" : n,                         (numeric) transaction weight as defined in BIP 141.
    "fee" : n,                            (numeric) transaction fee in BTC (DEPRECATED)
    "modifiedfee" : n,                    (numeric) transaction fee with fee deltas used for mining priority (DEPRECATED)
    "time" : xxx,                         (numeric) local time transaction entered pool in seconds since 1 Jan 1970 GMT
    "height" : n,                         (numeric) block height when transaction entered pool
    "descendantcount" : n,                (numeric) number of in-mempool descendant transactions (including this one)
    "descendantsize" : n,                 (numeric) virtual transaction size of in-mempool descendants (including this one)
    "descendantfees" : n,                 (numeric) modified fees (see above) of in-mempool descendants (including this one) (DEPRECATED)
    "ancestorcount" : n,                  (numeric) number of in-mempool ancestor transactions (including this one)
    "ancestorsize" : n,                   (numeric) virtual transaction size of in-mempool ancestors (including this one)
    "ancestorfees" : n,                   (numeric) modified fees (see above) of in-mempool ancestors (including this one) (DEPRECATED)
    "wtxid" : "hex",                      (string) hash of serialized transaction, including witness data
    "fees" : {                            (json object)
      "base" : n,                         (numeric) transaction fee in BTC
      "modified" : n,                     (numeric) transaction fee with fee deltas used for mining priority in BTC
      "ancestor" : n,                     (numeric) modified fees (see above) of in-mempool ancestors (including this one) in BTC
      "descendant" : n                    (numeric) modified fees (see above) of in-mempool descendants (including this one) in BTC
    },
    "depends" : [                         (json array) unconfirmed transactions used as inputs for this transaction
      "hex",                              (string) parent transaction id
      ...
    ],
    "spentby" : [                         (json array) unconfirmed transactions spending outputs from this transaction
      "hex",                              (string) child transaction id
      ...
    ],
    "bip125-replaceable" : true|false,    (boolean) Whether this transaction could be replaced due to BIP125 (replace-by-fee)
    "unbroadcast" : true|false            (boolean) Whether this transaction is currently unbroadcast (initial broadcast not yet acknowledged by any peers)
  },
  ...
}

Example:

// Request
curl https://bitcoin.blockpi.network/v1/rpc/your-rpc-key -X POST -H "Content-Type: application/json" 
--data '{"jsonrpc":"2.0","method":"getmempoolancestors","params":["000000000000000000020b1823dfd1bd92b9ae7821a38e63ac24e06db765d7db"],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": { ... }
}