{
  "manageEntity": {
    "action": "Save",
    "entityId": "622798256",
    "entityType": "Track",
    "nonce": "0xa691e1f34c5638778144ecd5fd8d70fe50a700f5bd09f31648a5b52763eaab95",
    "signature": "0xbec53fa41e6cdd578996cdc45b5d4ccd7f20f4dedc5fcdbfbe35fc15c73ba5be69f0b76cb5a3629af7de8c78be4235c3c8332912500f1c6767ddee7e61899fb91b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}