{
  "manageEntity": {
    "action": "Save",
    "entityId": "492150625",
    "entityType": "Track",
    "nonce": "0x2c83f27d1f7b7ae5b221856d86e3efde8ad421512aa6dc27b973b587b634db22",
    "signature": "0x674742d0f699710b525c137bcde56543c273f373663c371875835757f2fdd04a5dad9af135a562d6c08de7a949af188c30339af46bffbcecc38033edd6eb3f141c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}