{
  "manageEntity": {
    "action": "Save",
    "entityId": "387727637",
    "entityType": "Track",
    "nonce": "0xf4a56c83e8ae77649adcfb3ed2a28ce0a4291da45089fd3d75db79c837c5995f",
    "signature": "0x93e23c2494c0098d0c4de58536129b7f88a67862e20433a44560a5f3dcd9e9b4645f66b22c66d61b1b27a244c9c48bceab6d7981778b95e498f9dc84f4a767261c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}