{
  "manageEntity": {
    "action": "Save",
    "entityId": "688243571",
    "entityType": "Track",
    "nonce": "0xc535c145519a3be9320533f3b047b57a1a4a148c4748e261ef76069cd77b5ccd",
    "signature": "0x2fb2ad364166407f40cb8a935de751ae6b07c294b940850e8bebc31f7f383907617cb2ed48d61846f8d2e6c873f066ca266590645a2b6eab5d7616ae61541b981b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}