{
  "manageEntity": {
    "action": "Save",
    "entityId": "575823",
    "entityType": "Track",
    "nonce": "0x6733c13aa598c385d5d9fbf027686a805e22859f250a73b7ede540be8df07359",
    "signature": "0xc918f011311e27504af126589fd4cb77201f6ac6ff82d8fd92d5c44195caee1a4d1316923fbfac06416e29d7f8f4f25697571c77f56037d8890da1ce598c80c81c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}