{
  "manageEntity": {
    "action": "Save",
    "entityId": "1562734145",
    "entityType": "Track",
    "nonce": "0xa9e965ccca65f14eb3ab825679d829c66828dd4af366a7dee05f65b4e7bfc7af",
    "signature": "0x7f879d3f09998452d0e2e733b9f7be856b38bfeb82161afc1c3dcaee5c6f46fa29f268e131f4967075bdffa8ee6babed7c9ac61e7522581244afe9db55b89e4f1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}