{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616404894",
    "entityType": "Track",
    "nonce": "0xcd7e67b9f88c864d192d79be56a11cf44cdee8b24138d1fcb96f35a056718790",
    "signature": "0xe1de56f3f305d7e13b8355206e014e19fc5a191a5a7a4bc683f0dbebc1b290683623b0b2bddfa6fc4c44f7a1999d78f26c4e6bdda2efd5152f91e4b4fcdc3fe11b",
    "signer": "0x7Cd44Dc53B13eEA7335A000Ce36c05cDFE34b348",
    "userId": "355113"
  }
}