{
  "manageEntity": {
    "action": "Save",
    "entityId": "874892",
    "entityType": "Track",
    "nonce": "0xe87218efb15cf91a069d8daec7e932301c5cf8cec54edb6a65bf6d7c8a935456",
    "signature": "0x0ee593d3f8947fdf325eead001304e9420e1e16fad950170f1b289eedee8da624fb8aaf1b51c251a3745061dbded4cab560965cc1a333805630aaf268d6e34931c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}