{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549912917",
    "entityType": "Track",
    "nonce": "0x13e5230ded999465735869c9d13a42004e5fdc5651cadaff628d9d7870bcc62b",
    "signature": "0xac387271602c15346a8e3a41bd199047119983d89415a3a2fe05e195a72ce60f47ae4aacaf251934f4b9e4af311c729ba9b4fa43390e8e97bd75f51ca04e29691b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}