{
  "manageEntity": {
    "action": "Save",
    "entityId": "752419797",
    "entityType": "Track",
    "nonce": "0x1a3d36185c8daa239641648e951fdbbc1e1bcc81e73c75b460cc40a9650702f3",
    "signature": "0xb3df4d81dce0da836a9eb3927c7598b77aef7f7fb86bdd2fce5734a811b6ac8a74ee6ab2b342efa81ae65a490687a64d096180e161b00b6ec7ae08a08a4d32331c",
    "signer": "0x1386f47791796D9eE653445d5eA6E520269F0D79",
    "userId": "388193"
  }
}