{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402833928",
    "entityType": "Track",
    "nonce": "0x2dd549b43ef5daa9e0744484596afdb3aa71603a12dce2c023be0a9d34b41552",
    "signature": "0xba897dde85879c6d7454847fb6bccc4ee3d5a7fb8e9df41204158b22795e38b32d206583edd18924e765d0c7318518d72d2ee00e5fd50450d3455112d54ee5dc1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}