{
  "manageEntity": {
    "action": "Save",
    "entityId": "1247739600",
    "entityType": "Track",
    "nonce": "0x569b83a5558368637d292dc53b9b91d1afe37366459f66cb85b7a02bde372daf",
    "signature": "0x6d88c8898ea051529ebbfab146cbd2245ccc89c356bc699fe26892335d571f2c681bcec207f580f1e045bdc6c5e2af4ddeadb7f425494a2175115b9634a698651b",
    "signer": "0xE4cD33CA403714dEEc032635D51d9D3345c225d2",
    "userId": "967323686"
  }
}