{
  "manageEntity": {
    "action": "Save",
    "entityId": "1189710825",
    "entityType": "Track",
    "nonce": "0x672c7323e725ac0d139a355d2f680176a747cb4d4e294bfd3faaf52c6b9cf267",
    "signature": "0x9f7a9b7dcf99243236deaa10e2cc4928213236a36f4a284c9afa7cf01c7b40eb10ea79bf17f96d305cb1c610820dcb602b95f56b2a3ca1a2f8ef5b76f478aaf51c",
    "signer": "0x52F331C086a11941E738a6C86d9F127E934dDEB1",
    "userId": "281470566"
  }
}