{
  "manageEntity": {
    "action": "Save",
    "entityId": "828568746",
    "entityType": "Track",
    "nonce": "0x37a35bfac43b488186a30e27c4c44a9b0132e4482fa75314828f77eafec5a9bc",
    "signature": "0x4c7dc5441561d759f72ce9382faf5ad4384f32d51e326829acb48e50771912ed4fbe94a125de442eba5acb7afa9780482ff9e33c3fb6c16f3e77bd62e398a7eb1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}