{
  "manageEntity": {
    "action": "Save",
    "entityId": "321238727",
    "entityType": "Track",
    "nonce": "0x740ca1e5909b70828c105e467ee71b742484b04d611c3513a9d468e07f954366",
    "signature": "0x47d8e40ea1540c8a6d736e3cdc4ea83c99d08ec11742eac9b15cef7bfe904e5d187964babb52c2494428c1a42520c24cca565a7eed52c47b0c587b634d9c16a01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}