{
  "manageEntity": {
    "action": "Save",
    "entityId": "149511",
    "entityType": "Track",
    "nonce": "0x5cd3ebadc60683538de366fa5065486a628ce97eb99d76acc3d089d6a4347797",
    "signature": "0xa73cee51587e8a0dc4e37170c16b84a590cdd608009e54c3f5c32ba4e4a1860d18cf99b129bc86108719996d71bacb0f1e1ccab667f26bd0bb1521b66fb1b8371b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}