{
  "manageEntity": {
    "action": "Save",
    "entityId": "1728018588",
    "entityType": "Track",
    "nonce": "0x7fc516e56bf8645c8d9788d434e293a2a858d7a7dd8dd17025067edcd0b101fb",
    "signature": "0x8a14f707eb0a47623bc66e5816161c8b4c0b942e6513689796e79b4e3980eeb64e74caf043534b8944249dac63b3600196796098949fc6316930a354e7eb72de1b",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}