{
  "manageEntity": {
    "action": "Save",
    "entityId": "81508123",
    "entityType": "Track",
    "nonce": "0x639deb8fd91f690e79cc7d27fb1797fa67a73909cb31dc32332da25b92b6a16c",
    "signature": "0x5b30dc7e1df65befdb4c481fcf8ccb56f4902e772f528dda2a31a0971fded6f23fb56d6fb3d6a534489d73ff98dc25dd3ebb9ffe3f36dd6a3f692970e853655a1b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}