{
  "manageEntity": {
    "action": "Save",
    "entityId": "1328902868",
    "entityType": "Track",
    "nonce": "0x38b960764438cebc71e4ba707b6bfe859a189b3b0feedcfb0c9c599d01bf4655",
    "signature": "0x0e1b31d5bc8ffc5c11dee8ddeaf1f46aebd9c599d303b9811c5a91252f56585743bf9d6a9bc9fcc41b501142930a55ad4a184a5a396a623f7cc94ab9992d02841c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}