{
  "manageEntity": {
    "action": "Save",
    "entityId": "691507",
    "entityType": "Track",
    "nonce": "0x7eb609741a296bd99ea9b40416e00ac473736f555a37d24125013e5f01f228f8",
    "signature": "0x19c7096fdec9f877bc361986b9bb857422b17ea4698dc44bb2433e20b32933915701d58f42a5fd5572c4fd8eb6ed810c10b6a49b1e3528f2a291a73ff8cdc7681b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}