{
  "manageEntity": {
    "action": "Save",
    "entityId": "603029",
    "entityType": "Track",
    "nonce": "0x1b5047fffa4d955455c381d9483592c21f6a459a0e4326b07a3658f4cb98c018",
    "signature": "0xb0680b996f5da39c9aa87e1f5ac5b8245359c27356bf36333e4fccc8968c98da23953d1c51fed64c212cfb2e7f6b4a28f1c11bd2934e7a34bbc28822f37763601b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}