{
  "manageEntity": {
    "action": "Save",
    "entityId": "800591",
    "entityType": "Track",
    "nonce": "0xbb7373b1f8ad266cde5a547ee7562a0f77fbde5d23b44f7c300cb130c1626a77",
    "signature": "0x949e9d66defe71d3359e71bf3cd1f92fd9a3c36fc710a9f68d9c6b300d25b8ad14ea8291e4950c127f99bb0457ccbd0143835ff51bed4810396861776d78f8291c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}