{
  "manageEntity": {
    "action": "Save",
    "entityId": "55048299",
    "entityType": "Track",
    "nonce": "0x1ccfd5e8d2e6f2af3523cd2188dd510b77699b8adb746466a0f45f49c2d9b4ea",
    "signature": "0x21d25157ef2b297a9ead26e884f631c9e79df0b54d1758dd49f9b40b7fd8ee034c4b670ef0ae80ced73639c11a3497af26d45e3c08f0ac05c508085d859f82b21b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}