{
  "manageEntity": {
    "action": "Save",
    "entityId": "550661",
    "entityType": "Track",
    "nonce": "0x08165a1b501fde055061bf19202d7fcde28de267f31187b53e994d66d6a2c6ec",
    "signature": "0x727cf11abb4493846328060807ff083a5348deff5d7ad5ede728e7a516a4843761cbe73fea1866fe0b6563fce63698736e60135437a653f0b9287559d7eb3a8c1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}