{
  "manageEntity": {
    "action": "Save",
    "entityId": "857832390",
    "entityType": "Track",
    "nonce": "0x84c3299277ceee0eca870aef439cb0cf0692f576934097cba0812a632352c8c6",
    "signature": "0xbb29d03d9ab0568e8ca6e2ff688233fafdb8d1c0244b052914e124aed3a9fe342a664feead2c53703de132b0b0f57d382d2fe6bc9b94bd80dcd4b72143119e131c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}