{
  "manageEntity": {
    "action": "Save",
    "entityId": "1223803365",
    "entityType": "Track",
    "nonce": "1789834131697362891",
    "signature": "0x47d264628a6547bff0b6b42e91b993ede0094b010efb6f88d1d61ce71d3c018b532aeef7cc9cf9925592dcd412e90a0ed039e600d052b4b000eec543885abbd21c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}