{
  "manageEntity": {
    "action": "Save",
    "entityId": "284865815",
    "entityType": "Track",
    "nonce": "1786724867974625664",
    "signature": "0x398dfcf646d98e239ec7a32c1870169be839e7c10d02a3822fbf2daec10e3de778efe7c0608a5ea471b18d6728894641c981ab258d9cd83f56b30f331ee1be3a1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}