{
  "manageEntity": {
    "action": "Save",
    "entityId": "428368",
    "entityType": "Track",
    "nonce": "0x70645a1731c8573d41fd9b8cea9f7b9d66ce7907c5c0e38fff2ff376ac6f500b",
    "signature": "0x1d5b705d52e750397e4a9b5ad20f62f5a727fa4c7fc040242ce4b919531d3c062c062651d4f13447c082de724721a3350b249b9e6deaa9c6f34ff50f628d2fde1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}