{
  "manageEntity": {
    "action": "Save",
    "entityId": "758894678",
    "entityType": "Track",
    "nonce": "0x023936dacf0408c5b0fc4c057a77cf2788080187075bf1e6e4f1e74875cdd1f5",
    "signature": "0x3379ad322b40bd75cfcdc2235c22bbe8342d597045290c5ac7094c734aa6580759db65cb6f4fcdbc506195e484e919efb328c437ebdb2f00ac5afe0bfc61f8af1c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}