{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618557208",
    "entityType": "Track",
    "nonce": "0x8335e396821bb67b14a756df398cde6cb7a8b60218acf498edcb10225ac27f27",
    "signature": "0x21c5d320e200ded9e8c242ebee73f347cd1695cf921f4a0ef8caf8effaa2df7e1dff20255bef54ce69914e0e6d90b497f7fec0feb924460059196112e490cf8c1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}