{
  "manageEntity": {
    "action": "Save",
    "entityId": "254015863",
    "entityType": "Track",
    "nonce": "0x2546ca40137629437f3aae58e5cd9ab40d2b9553ac11980605ea5813414f8478",
    "signature": "0xe98e04535e6c9c1bd4e0118af3b7ed61901add065b30ee2a669d4d28ad0104d45c76190012a716670769aec2fa7dc50f8257cf0720956576e4023cea16c1a1061b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}