{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507129729",
    "entityType": "Track",
    "nonce": "0xad07ff3193b3681e49f6ae6d44242e6dfd4da03b51fd46bc7c69c1c239ebf518",
    "signature": "0x7714ec732c33307578d937a6458ce1dba2ae0c39329328fb072429b4489b9deb583ad656f6592213e46afc0e67b84c637e6833c74efa8b1e15f1d780be3298401c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}