{
  "manageEntity": {
    "action": "Save",
    "entityId": "669258603",
    "entityType": "Track",
    "nonce": "0x2b7f5869280bcb335a007edf19606594b94d66c53d473a11c5666fa61f6151d7",
    "signature": "0xbf3b4df7591d593953ae79904f78546c100e4b7a18ea1272430fe94ad3d465353a7a0a85f1377ffa72b6957257ee9b55d81c32e2577df3626bc13789e508b4331c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}