{
  "manageEntity": {
    "action": "Save",
    "entityId": "1004746961",
    "entityType": "Track",
    "nonce": "0x91f7e0b56c8159924630f7e8a2e5e32587ded619715b9946c1cc976257c9c695",
    "signature": "0x63cfde6262b93aa50ef53b9d1c7e2b8c1e39ef352a1aad52f79f7ab3172f6081751934d34a94279671ac898ef5aafd08b35e259e007368d3c4c6b7f4d67cce9e1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}