{
  "manageEntity": {
    "action": "Save",
    "entityId": "450156",
    "entityType": "Track",
    "nonce": "0x7a7c3f59ae1e61c38e132ffaeddb7aad49c59ee7bd027d3cb52cab0d1d96f6fa",
    "signature": "0x017fca8317e72fbcb78eb47f7d60ebaa67c51544a13765fa46b768ff4ba4093d7c4bcda3e1d1b2a10ce96de8d25f7b4b42987e8fc877eb69037a7fedbd8841181b",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}