{
  "manageEntity": {
    "action": "Save",
    "entityId": "693891884",
    "entityType": "Track",
    "nonce": "0xd0b42301f0e66160322b4e28d19b585203621ed7fcc0a00316aed0fe0416578c",
    "signature": "0x8b3ac1726cfce27b9f2ad7bad04b60fdc022bdd8c316f492e8583754a03928b715f27705fb5aa2e89188788aa17a4f4f08dbdd61a50a46b33a456ba60bcc01681b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}