{
  "manageEntity": {
    "action": "Save",
    "entityId": "45674461",
    "entityType": "Track",
    "nonce": "0x64dcf149b1477e54217bcdd2312d41446969aa02733e10bb694d9f7bb6c896ad",
    "signature": "0x1c2fc36b28f73603083113a974be6b201cbd8050f4c04f0812617b93695abaae55eed9d92bd919e6d89f4ff66f76f33964e64fc30d1e1b195829e0a26f6c5b0a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}