{
  "manageEntity": {
    "action": "Save",
    "entityId": "378080845",
    "entityType": "Track",
    "nonce": "0xb779c617b0e4bf0cc9472cd832cae66b72fae355d8aa1cc0fa7b8437c64e2157",
    "signature": "0x4f17396077b8c545235c6426d9a659829697ce0a924fa8b757a7158518a845fe2780f5040e68c802a48df94492fa8aa91b8656a4819bf6491449f47b6b13dcda1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}