{
  "manageEntity": {
    "action": "Save",
    "entityId": "243082178",
    "entityType": "Track",
    "nonce": "0x4bd47a20c5887fd383f8d974b15531c57e263094635f7fd28eb8a7559b6acdb0",
    "signature": "0x2a21c544488e3714e1a4a1f9b5bd1cdf666a70f1d6f94bb4f794f3bc56fb790163f23b72fb65f755ded0a34d86b732f94c6fb8719ce11b3fc5a979b7ac721e641b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}