{
  "manageEntity": {
    "action": "Save",
    "entityId": "778685903",
    "entityType": "Track",
    "nonce": "0xcda4c676ab7b86e750ff013a00e48524704325cc1fe1a8f13afdd10b79fdcfdd",
    "signature": "0xc980e71ac56752edcedfe2e5924c5530a381c557b5c976dc311be1e6d86153993b16d0deada06cef584f212a1e447541f96ad38e189a56dabc1951469cb18e6b1c",
    "signer": "0xc07fCE503240350b65217BbAc77c303Ac8338F90",
    "userId": "512214950"
  }
}