{
  "manageEntity": {
    "action": "Save",
    "entityId": "750415874",
    "entityType": "Track",
    "nonce": "0x14fb46bd331ede751b6c48272957053865ecc402696a60641d06168821a4fd23",
    "signature": "0x0e6ca15d54dd5c2a5e5a6991784f2768a082fed2d0deb1bc55a159f595562dba3ce623f3bc622f07f3a2bfd7ff44628255a86f31108144af9a6e65a3efce351e1b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}