{
  "manageEntity": {
    "action": "Save",
    "entityId": "303075",
    "entityType": "Track",
    "nonce": "0xb42a745cbc9e03a7ae1b25058a9a5df0cdd9b2896420a8841dc73a24e4de2817",
    "signature": "0xdf63433c48cb52259b6c55eafa1773ee0512625478809682237ef4a2661a03a970eff3eee0c59d62db95635717384d46d3feddb08a3e8251c6c616853fbe90401c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}