{
  "manageEntity": {
    "action": "Save",
    "entityId": "245819371",
    "entityType": "Track",
    "nonce": "0x9ba4b1cd96ad9235f510d9577f1b6a40f760bf7dcf30fb58ed305bef27728d43",
    "signature": "0x895397e3d76d06fa330cc5ab0e419691f621aa5555cc47b98087acb01d18914a7a17fdc3f2a3b03e4bc97681723b5bd41a3f697315fcaa2e2284260d6da3d92f1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}