{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890879150",
    "entityType": "Track",
    "nonce": "0x50e831b0b2563b287ecc7c0d83645fc21d05eeb58a88b8ab0091c6c015e74061",
    "signature": "0x8fd7dd005f9136f68cd78929a02f1586e0586c59bdc15692531bc7d66ee616ca25a29bf008bcb1d7ea129dd9d77d5afab61fae4e8d1ebd53c47adc19389743f91c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}