{
  "manageEntity": {
    "action": "Save",
    "entityId": "509985043",
    "entityType": "Track",
    "nonce": "0x864ed57377924b462c40261f4f80fa3c8b473b8d0e2f9a23c16002eefaab19da",
    "signature": "0x39173a067f22dc93cd82c12601e52f9c0b7a06fb526a9e67ca3e471bd732c2464d37328e682a017677854669f0a9fc59aa9993e86490458d2e622faa76917fe51c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}