{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900990159",
    "entityType": "Track",
    "nonce": "0x865b6e6512ee88fcdd51413ab2bdc927e6cea678f36d691aeb9fc9e7279d1b2c",
    "signature": "0xc7bc012072e1f9bd6765430393b749e857c4330d3c7f3be0c6a8f6126c09fe603c02ff65ac1a0973b529e652ec192663faa51532ab5f5a0d4ed4433e892a06471b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}