{
  "manageEntity": {
    "action": "Save",
    "entityId": "551318",
    "entityType": "Track",
    "nonce": "0x1987534dda4771ba4ba5d6dc8d1c6c5b9b221efc40847f884178a6e8b91f62f0",
    "signature": "0x3eff55e68d5a7328266e3d9297ade325b9c3b540a5748d0b743d1e4c848e4e45535f7c0b8623fc8ed4ddc3259b2f189153aab73adcff95a5d05bdff2011d503c1b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}