{
  "manageEntity": {
    "action": "Save",
    "entityId": "203389676",
    "entityType": "Track",
    "nonce": "0x0f2285ea19bba3fdd9541878a769889d7b0b627b98a55d015f9e2f4de323cf69",
    "signature": "0xddf2d737d2e763768721a978adae30a88be4bf47d47b96b8f9dd0b15991d54b50954108c454a13eb615391e1270824c3235f258564b3f9bce7f3bf63ce3f69d21b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}