{
  "manageEntity": {
    "action": "Save",
    "entityId": "1442299157",
    "entityType": "Track",
    "nonce": "0x2d84a9cd862153f8ce42b3ae820cb21576a450c75d458b09897e2597be65f036",
    "signature": "0xa4f368a282674e9ac19691d8169311ef5caceb4cccc53cb8d87b410a07e6a1725f6be77a5742c79b8bfb2a1b6b750cd239cc426f7b62f90bcf8a098603677d141c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}