{
  "manageEntity": {
    "action": "Save",
    "entityId": "329296",
    "entityType": "Track",
    "nonce": "0x0d5a9d354107fcf0945e86ba76c5534aeff58dd6195f1bb112f23c7773afcb6e",
    "signature": "0xef46e468ba4a6e4a039f3e34930a6e60d32e9e36cdf9238044debe739578e6e333e840c14d46f8f10187eaf06037b88966783e787ddcebfb11e16d8882fca2d31c",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}