{
  "manageEntity": {
    "action": "Save",
    "entityId": "1575735087",
    "entityType": "Track",
    "nonce": "0xf18448626e931b080acfae1e2d9c61d423b34c7db0cdfe1f093873f23e53f047",
    "signature": "0x4805c559b7bd6fac5a8a7db3e68fb9ba4daee834cb4ee7766080a654584f71752fe5ded6b1a7b59466223f8fad47ea99f5b625f0f724eae5398a50d5cd71af6c1c",
    "signer": "0xfe73cd4bc8E45c5aC794633336A85475bD51b0f2",
    "userId": "284924323"
  }
}