{
  "manageEntity": {
    "action": "Save",
    "entityId": "981443",
    "entityType": "Track",
    "nonce": "0xe175e3601dbba2a83c4a93f2f5b3ea9c4bbc9d47379a0bf5aa43a9dfb6300721",
    "signature": "0xc227b4033b30a701fef4004ec2ab52ff7a80827253f8a2c5abea80a3338b7b7b57fd865f0020d2582287453cb7a903cf411b7cbfd3845f7df5cdec5e45e46e571c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}