{
  "manageEntity": {
    "action": "Save",
    "entityId": "299104529",
    "entityType": "Track",
    "nonce": "0x159b8eec7654d679625d091021c685e96b463d63b13498fc901a2a846be4a578",
    "signature": "0x9525a298034073be631fe599a301b9563029b1c449126a4c68eeb3823d5d0f107e962e3ebdbcc98250bd341fa87e23cf021b45ddc0d22248e406e57cc82bfd971c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}