{
  "manageEntity": {
    "action": "Save",
    "entityId": "887191",
    "entityType": "Track",
    "nonce": "0xf2a72dc0674dbeb608f2f01a7a1ba7969aeb7266812bcb1d1b6a6abfad83dbb8",
    "signature": "0x06c349f27e2ec02c9bc5d535f74766817e96f0e548a7af9ae58d8d71dfa6e0782810bbebe6abdba72bd2808d28651ef626f47cb322e388c5db78e50b0ea803991b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}