{
  "manageEntity": {
    "action": "Save",
    "entityId": "1138444307",
    "entityType": "Track",
    "nonce": "0x50ccb599b50cde555e3e5f6193720b9661da94ac84afd7095e41c30676b1e42c",
    "signature": "0x5b6f5c63f8e2415243628493e09733b234c3f7b3bfcd6ae6f8949ceec531ba812b7165a2fa07b3658dffc24b6eb934e798efdbe56c8017b67e27d65fb4a19ac61b",
    "signer": "0x44c6c9974E4028ab550E0311F9A04Df023477958",
    "userId": "152450"
  }
}