{
  "manageEntity": {
    "action": "Save",
    "entityId": "402291",
    "entityType": "Track",
    "nonce": "0x7bf34fa6f995e32e03d87d788d65179521ab2d8271efa64dc24be8801cf41bd6",
    "signature": "0x855c5a3838ae4a5a339ab6ab71c432fada760e861731fea31cfc54ea52e04dbd0130daeb2063d62819e42f6f800cdde455636ad9bbdc22bb6930d57c0d9716da1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}