{
  "manageEntity": {
    "action": "Save",
    "entityId": "306460",
    "entityType": "Track",
    "nonce": "0xad577504031d9f135e77a89bf4ddafbf9e4ff36570de5017bc1be14ae6af7a01",
    "signature": "0x9ae00b44432c110c1654c90fcc0bb7c9e7fa6223bf9bdd5242572d40543a0d87106d475e8ec3774bea12cf4e96d0daa792b601a4bb83b3b993ee9ca36e5051bb1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}