{
  "manageEntity": {
    "action": "Save",
    "entityId": "1674818924",
    "entityType": "Track",
    "nonce": "0xfcb75b74adadcb0261f2f1ee7d80838e7f8ff2f225357e14ba67f7984d13cdd6",
    "signature": "0x949412dbbfe7129cd6bddb6d608ecc5a5de25bae7cd42474a337a7505e7f179a09c3161315b2d590131762d084398df822d9081ccd900bc522ffdcea25673fc71c",
    "signer": "0xD7c3dC9EEf2D94568C0e1A9C88b58696850c7C22",
    "userId": "125737"
  }
}