{
  "manageEntity": {
    "action": "Save",
    "entityId": "1538951205",
    "entityType": "Track",
    "nonce": "0x26ded8126a30d893b40dd389685f3aacfaf4bff22e64a8929d2890d4a38ece73",
    "signature": "0x3377966b5d16b8f58d1cd13639c16d8711158fdd9411cd03e0790333c804b7705465aef99fae94fbf62e5bd9045c3423b196ec43acbb33d6c5c19ff3ab772bfb1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}