{
  "manageEntity": {
    "action": "Save",
    "entityId": "309360513",
    "entityType": "Track",
    "nonce": "0x348f0d308fd72acbe3fcb0ee6d332c773e0a39ccf9a1aaeb3779b79f713683ed",
    "signature": "0x911672edbcbf4f19233c4402d30081218c1eb622ca1a22739358aac4ae4b871c1ec5bbbc2c7612c6a2dc51f14ee65d734f5634ed4bdcf44d3eba959858c516cc1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}