{
  "manageEntity": {
    "action": "Save",
    "entityId": "658120355",
    "entityType": "Track",
    "nonce": "0x73c4022dd8110806c140233e270c7094633e956438bdbbb4d80abf610589b896",
    "signature": "0x6c1477ac1230c89fd93782c1f851c2c1e3a64a08c0009c9f41586c0022d9f11f022de2a92932e0ea5aa8ac88a6f724c550568f97373cbe18cd8a7c3c648f51901b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}