{
  "manageEntity": {
    "action": "Save",
    "entityId": "470057229",
    "entityType": "Track",
    "nonce": "0x4207243f37876ee480c4e05e59b51ac87d07fe93cc828909f79cd7f5fbb4dfcc",
    "signature": "0xb5f34b3fb9ade7e2c75c85f1398270a4faf3024ea5270a0fb7850a97d40d1ca67bf780e5ee5e8b5469b8df00971b1a37ccf9a135e5ca4486d281e5b70c8dc6fb1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}