{
  "manageEntity": {
    "action": "Save",
    "entityId": "946606",
    "entityType": "Track",
    "nonce": "0x422452a6497f4235729f037fb0b9f2b810bb2b4baba7c24ee3cc3f1b38f5e8ed",
    "signature": "0xf07a38f1ddaeb6a7b1780083e51b4cdd52e157901d8ef88fd60b7256e29b880b4c9c7ad1e5bbbf05e3b7e24a829ba6f5665fbf97aeb094c55ba210ecb3ae1c511c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}