{
  "manageEntity": {
    "action": "Save",
    "entityId": "128147",
    "entityType": "Track",
    "nonce": "0x3697eda90bf4edb0aa129b45b4635456592629712ab0008e51b8e45cde1e7b30",
    "signature": "0x7426e131923300e845f5ae22f76e48729f60afdc34b2ca9739fc28e23d72d59435164d38ce4ab01c8286ce5da3345b63aede313dee9ed45a4f2756a64386bcaf1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}