{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999428500",
    "entityType": "Track",
    "nonce": "0xa83634e4746c0bf8681ecf7a225c9d4cbaab5fc093a19c8d97f79afebccb20b3",
    "signature": "0xf0eef552ed473b3ef19ffdf8a97cc0d13575e0257e70d69a71122d193d0974c472e3edd0769c4694a2651d15212283843049f55eab2212e1068a448230d7565a1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}